阅读说明：本技术 一种锌银储备电池隔膜及其制备方法和锌银储备电池 (Zinc-silver reserve battery diaphragm, preparation method thereof and zinc-silver reserve battery ) 是由 崔彦辉 王文伟 于 2020-12-25 设计创作，主要内容包括：本申请公开了一种锌银储备电池隔膜及其制备方法和锌银储备电池,所述锌银储备电池隔膜由亲水性多孔无机颗粒嵌入三醋酸纤维素膜,并经脱羧处理而成,所述亲水性多孔无机颗粒的用量为所述三醋酸纤维素膜重量的0.5%-30%,所述亲水性多孔无机颗粒的粒径为50-1000纳米。本申请采用亲水性多孔无机颗粒对现有三醋酸纤维素膜进行改性,通过溶液重塑的方式使得亲水性多孔无机颗粒和三醋酸纤维素形成致密的复合膜,进一步对复合膜进行脱羧处理后可以得到吸碱率高、吸碱速度快且耐碱性高的锌银储备电池隔膜,保证锌银储备电池隔膜能够快速启动,并在碱性环境下稳定工作。(The application discloses a zinc-silver reserve battery diaphragm, a preparation method thereof and a zinc-silver reserve battery, wherein the zinc-silver reserve battery diaphragm is formed by embedding hydrophilic porous inorganic particles into a cellulose triacetate film and performing decarboxylation treatment, the amount of the hydrophilic porous inorganic particles is 0.5-30% of the weight of the cellulose triacetate film, and the particle size of the hydrophilic porous inorganic particles is 50-1000 nanometers. This application adopts the porous inorganic granule of hydrophilicity to modify current cellulose triacetate membrane, and the mode of remolding through the solution makes the porous inorganic granule of hydrophilicity and cellulose triacetate form compact complex film, can obtain after further carrying out decarboxylation to the complex film and inhale alkali rate height, inhale alkali fast and the high zinc-silver deposit battery diaphragm of alkali resistance, guarantees that zinc-silver deposit battery diaphragm can quick start to stable work under alkaline environment.)

1. A zinc-silver reserve battery diaphragm is characterized in that: the zinc-silver reserve battery diaphragm is formed by embedding hydrophilic porous inorganic particles into a cellulose triacetate film and performing decarboxylation treatment, wherein the dosage of the hydrophilic porous inorganic particles is 0.5-30% of the weight of the cellulose triacetate film, and the particle size of the hydrophilic porous inorganic particles is 50-1000 nanometers.

2. The zinc-silver reserve battery separator of claim 1, wherein: the hydrophilic porous inorganic particles include at least one of a K-X type zeolite, a K-A type zeolite, a K-Y type zeolite, or a K ion-exchanged metal-organic framework.

3. The zinc-silver reserve battery separator as defined in claim 2, wherein: the dosage of the hydrophilic porous inorganic particles is 10-30% of the weight of the cellulose triacetate membrane.

4. Use of a zinc-silver reserve battery separator as claimed in any of claims 1 to 3 in an aqueous zinc-ion battery.

5. A zinc-silver reserve battery employing the zinc-silver reserve battery separator of any of claims 1-3.

6. A method of making a zinc-silver reserve battery separator as claimed in any one of claims 1 to 3, comprising:

adding hydrophilic porous inorganic particles with the particle size of 50-1000 nanometers into an organic solution of cellulose triacetate to obtain a membrane solution, wherein the using amount of the hydrophilic porous inorganic particles is 0.5-30% of the weight of the cellulose triacetate;

pouring the membrane solution into a mold, and volatilizing the organic solvent to obtain a composite membrane;

and performing decarboxylation treatment on the composite membrane, washing and drying a product of the decarboxylation treatment, and obtaining the zinc-silver storage battery diaphragm.

7. The method of claim 6, wherein: the organic solution of the cellulose triacetate film is formed by dissolving the cellulose triacetate film in an organic solvent; the organic solvent is at least one selected from dimethyl sulfoxide, acetone, methanol and dimethyl acetyl;

preferably, the organic solvent includes a first solvent and a second solvent, the first solvent and the second solvent are any one of the following combinations, 1) the first solvent is dimethyl sulfoxide and the second solvent is acetone, 2) the first solvent is acetone and the second solvent is methanol, and 3) the first solvent is acetone and the second solvent is dimethyl acetyl;

preferably, the volume ratio of the first solvent to the second solvent is 1: 0.5-1: 5.

8. The method of claim 6, wherein: the organic solvent is volatilized, and drying is specifically adopted;

preferably, the drying temperature is 40-100 ℃, and the drying time is 10-30 hours.

9. The method of claim 6, wherein: the decarboxylation treatment of the composite membrane specifically comprises the following steps:

placing the composite membrane in an alkaline solution, heating to 50-80 ℃ and performing decarboxylation treatment;

preferably, the alkaline solution is 1 mol L^-1A potassium hydroxide solution;

preferably, the washing of the product of the decarboxylation treatment specifically includes washing the composite membrane after the decarboxylation treatment with deionized water.

10. The production method according to any one of claims 6 to 9, characterized in that: the hydrophilic porous inorganic particles are K-X type zeolite particles, and the K-X type zeolite is prepared by Na-X type zeolite through ion exchange;

preferably, the preparation method of the K-X type zeolite specifically comprises the steps of putting Na-X type zeolite into a potassium hydroxide solution for ion exchange to obtain K-X zeolite particles;

preferably, the concentration of the potassium hydroxide solution is 1 mol L^-1。

Technical Field

The invention relates to the field of zinc-silver reserve batteries, in particular to a zinc-silver reserve battery diaphragm, a preparation method thereof and a zinc-silver reserve battery.

Background

The water system zinc ion battery directly uses the metal zinc as the counter electrode, has the advantages of no toxicity, low price and high specific capacity (820 mAh g)^-1) And the like, so that the zinc ion battery is researched more and more internationally at present. The zinc ion batteries studied at present mainly include zinc-silver batteries, zinc-nickel batteries, zinc-cobalt batteries, zinc-copper batteries, and the like. Among them, the zinc-silver battery has high energy density (350 Wh kg)^-1、750 Wh L^-1) Stable output voltage, high power density, safety, reliability and the like, and can be widely applied to some special fields such as military, aerospace and the like. However, the zinc-silver battery has obvious disadvantages, such as short service life, high cost, dissolution of silver oxide electrode, corrosion of zinc electrode, degradation of diaphragm, and the like. In order to avoid the performance degradation problem of the zinc-silver battery such as corrosion caused by soaking the electrolyte for a long time, the zinc-silver battery is developed as an automatic activation reserve battery and is widely applied to the field of military industry. The zinc-silver reserve battery has higher requirements on the adopted diaphragm in the aspects of alkali absorption speed, alkali absorption rate, alkali resistance stability and the like so as to meet the requirement that the reserve battery quickly reaches full power output after being activated and ensure the long-time safe and stable work of the battery. The existing diaphragm generally has the problems of poor alkali resistance, low liquid absorption speed and low alkali absorption rate, and cannot meet the requirements.

How to improve the performance of the zinc-silver reserve battery diaphragm to meet the use requirement of the zinc-silver reserve battery is a difficulty in developing the zinc-silver reserve battery.

Disclosure of Invention

The application aims to provide a zinc-silver reserve battery diaphragm, a preparation method thereof and a zinc-silver reserve battery.

In order to achieve the purpose, the following technical scheme is adopted in the application:

the application discloses first aspect of a zinc-silver reserve battery diaphragm, its characterized in that: the zinc-silver reserve battery diaphragm is formed by embedding hydrophilic porous inorganic particles into a cellulose triacetate film and performing decarboxylation treatment, wherein the dosage of the hydrophilic porous inorganic particles is 0.5-30% of the weight of the cellulose triacetate film, and the particle size of the hydrophilic porous inorganic particles is 50-1000 nanometers.

The cellulose triacetate can be used for preparing a reverse osmosis membrane, but the reverse osmosis membrane has poor alkali resistance, low liquid absorption speed and low alkali absorption rate, and cannot be used as a zinc-silver reserve battery diaphragm; according to the application, the existing cellulose triacetate membrane is modified by hydrophilic porous inorganic particles, the hydrophilic porous inorganic particles and the cellulose triacetate are mixed in a solution remodeling mode, and oxygen atoms or hydroxyl groups are arranged on the surface of the hydrophilic porous inorganic particles, such as K-X type zeolite, K-A type zeolite, K-Y type zeolite or a metal organic framework of K ion exchange and the like, so that the hydrophilic porous inorganic particles and the cellulose triacetate fiber can be combined together through electrostatic force, van der Waals force or hydrogen bonds to form a compact composite membrane, the zinc-silver storage battery diaphragm can be obtained after the composite membrane is further subjected to decarboxylation treatment, and the decarboxylation treatment can prevent acetate in the cellulose triacetate from being hydrolyzed under an alkaline condition, so that the stability of the battery diaphragm under an alkaline environment is ensured.

The particle size of the hydrophilic porous inorganic particles is 50-1000 nanometers, so that the porous inorganic particles are prevented from agglomerating due to too small particle size and from influencing the binding property with the cellulose triacetate membrane due to too large particle size, and the tensile strength of the battery diaphragm is ensured.

The hydrophilic porous inorganic particles adopted by the application have rich pores, the dosage of the hydrophilic porous inorganic particles is 0.5-30% of the weight of the cellulose triacetate membrane, and the battery diaphragm can be ensured to have excellent alkali absorption speed and alkali absorption rate, so that the zinc-silver reserve battery can be ensured to be quickly started and to be kept stable in battery circulation.

In one implementation of the present application, the hydrophilic porous inorganic particles include at least one of a K-X type zeolite, a K-A type zeolite, a K-Y type zeolite, or a K ion-exchanged metal-organic framework.

In one implementation of the present application, the amount of hydrophilic porous inorganic particles is 10-30% by weight of the cellulose triacetate film.

In a second aspect of the present application, the use of the above-described zinc-silver reserve battery separator in an aqueous zinc-ion battery is disclosed.

A third aspect of the present application discloses a zinc-silver reserve battery employing the above zinc-silver reserve battery separator.

The fourth aspect of the application discloses a preparation method of the zinc-silver reserve battery diaphragm, which comprises the following steps:

adding hydrophilic porous inorganic particles with the particle size of 50-1000 nanometers into an organic solution of cellulose triacetate to obtain a membrane solution, wherein the using amount of the hydrophilic porous inorganic particles is 0.5-30% of the weight of the cellulose triacetate;

pouring the membrane solution into a mold, and volatilizing the organic solvent to obtain a composite membrane;

and (3) performing decarboxylation treatment on the composite membrane, washing and drying a product of the decarboxylation treatment, and obtaining the zinc-silver storage battery diaphragm.

The method has the advantages that the cellulose triacetate membrane is modified by hydrophilic porous inorganic particles with the particle size of 50-1000 nanometers in a solution remodeling mode, a compact composite membrane can be formed with the cellulose triacetate, and the alkali absorption speed and the alkali absorption rate of the composite membrane can be adjusted by controlling the using amount of the hydrophilic porous inorganic particles, so that the composite membrane meets the use requirement of the zinc-silver reserve battery, the zinc-silver reserve battery can be quickly started and can be kept stable in the battery circulation process; further, the composite membrane is subjected to decarboxylation treatment, so that the composite membrane can be kept stable under an alkaline condition, can be kept stable in a zinc-silver reserve battery for a long time, and is not hydrolyzed, and the performance stability of the zinc-silver reserve battery is ensured.

In one implementation of the present application, the organic solution of the cellulose triacetate film is formed by dissolving the cellulose triacetate film in an organic solvent; the organic solvent is at least one selected from dimethyl sulfoxide, acetone, methanol and dimethyl acetyl;

preferably, the organic solvent comprises a first solvent and a second solvent, the first solvent and the second solvent are any one of the following combinations, 1) the first solvent is dimethyl sulfoxide and the second solvent is acetone, 2) the first solvent is acetone and the second solvent is methanol, and 3) the first solvent is acetone and the second solvent is dimethyl acetyl;

preferably, the volume ratio of the first solvent to the second solvent is 1: 0.5-1: 5.

In one implementation of the present application, the organic solvent is volatilized, specifically drying is adopted;

preferably, the drying temperature is 40-100 ℃, and the drying time is 10-30 hours.

In one implementation of the present application, decarboxylation and drying of the composite membrane specifically comprises:

placing the composite membrane in an alkaline solution, heating to 50-80 ℃ and performing decarboxylation treatment;

preferably, the alkaline solution is 1 mol L^-1A potassium hydroxide solution;

preferably, the washing of the decarboxylation product specifically includes washing the decarboxylated composite membrane with deionized water.

In one implementation of the present application, the hydrophilic porous inorganic particles are K-X type zeolite particles, the K-X type zeolite being prepared by ion exchange of Na-X type zeolite;

preferably, the preparation method of the K-X type zeolite specifically comprises the steps of putting the Na-X type zeolite into a potassium hydroxide solution for ion exchange to obtain K-X zeolite particles;

preferably, the concentration of the potassium hydroxide solution is 1 mol L^-1。

Due to the adoption of the technical scheme, the beneficial effects of the application are as follows:

the method adopts hydrophilic porous inorganic particles to modify the existing cellulose triacetate membrane, mixes the hydrophilic porous inorganic particles and the cellulose triacetate in a solution remodeling mode, since the hydrophilic porous inorganic particles have oxygen atoms or hydroxyl groups on the surface thereof, such as K-X type zeolite, K-A type zeolite, K-Y type zeolite, or K ion-exchanged metal-organic framework, etc., can be combined with triacetate fiber through electrostatic force, van der waals force or hydrogen bond to form a compact composite membrane, and the zinc-silver storage battery diaphragm can be obtained after decarboxylation treatment of the composite membrane, and decarboxylation treatment hydrolyzes acetate in cellulose triacetate in advance, so that the composite membrane is prevented from being hydrolyzed under alkaline conditions, the alkali resistance of the composite membrane is improved, and the working stability of the battery diaphragm in an alkaline environment is ensured.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.

Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification are for the purpose of clearly describing one embodiment only and are not meant to be necessarily order unless otherwise indicated where a certain order must be followed.

All starting materials for this application, without particular limitation as to their source, are either commercially available or prepared according to conventional methods well known to those skilled in the art.

All the raw materials in the present application are not particularly limited in purity, and the present invention preferably employs purity which is conventional in the field of analytical purification or air battery materials.

In this embodiment, a cellulose triacetate membrane is modified with K-X zeolite to prepare a zinc-silver reserve battery membrane, and the zinc-silver reserve battery membrane is assembled into a button zinc-silver battery for performance testing, and the stability of the battery is tested according to the test result.

In this example, Na-X type zeolite was added at 1 mol L^-1Ion exchange was performed in potassium hydroxide solution to obtain K-X zeolite particles, which were used in the preparation of silver reserve power in examples 1-3The cell membrane, in which the Na-X type zeolite can be synthesized in a manner well known to those skilled in the art or purchased by a well-known route, is not specifically described herein.

Example 1

The embodiment provides a zinc-silver reserve battery diaphragm, which is formed by embedding hydrophilic porous inorganic particles with the particle size of 200 nanometers into a cellulose triacetate membrane and performing decarboxylation treatment, wherein the using amount of the hydrophilic porous inorganic particles is 0.5 percent of the weight of the cellulose triacetate membrane.

The specific preparation process of the zinc-silver storage battery separator in the embodiment is as follows:

adding 200 nm Na-X zeolite to 1 mol L^-1Carrying out ion exchange in potassium hydroxide for three times, and washing and drying to obtain 200 nanometer K-X type zeolite particles; dissolving 1g of cellulose triacetate in 200 mL of mixed solution of dimethyl sulfoxide and acetone in a volume ratio of 1:2, adding 0.005g K-X type zeolite particles into the mixed solution, and performing treatments such as stirring, ultrasonic treatment and the like to obtain uniformly mixed membrane solution; pouring the prepared membrane solution into a mold, drying in an oven at 80 ℃ to completely volatilize the solvent, taking the membrane off, and putting 1 mol L of the membrane solution^-1In potassium hydroxide solution, the decarboxylation reaction is carried out for 6 hours at the temperature of 80 ℃. The composite film is washed and dried to obtain the 0.5 percent 200-K-X/cellulose triacetate composite film which is cut to be used as a diaphragm of a reserve zinc-silver battery.

Example 2

The embodiment provides a zinc-silver reserve battery diaphragm, which is formed by embedding hydrophilic porous inorganic particles with the particle size of 200 nanometers into a cellulose triacetate membrane and performing decarboxylation treatment, wherein the using amount of the hydrophilic porous inorganic particles is 10% of the weight of the cellulose triacetate membrane.

The specific preparation process of the zinc-silver storage battery separator in the embodiment is as follows:

adding 200 nm Na-X zeolite to 1 mol L^-1Carrying out ion exchange in potassium hydroxide for three times, and washing and drying to obtain K-X type zeolite particles; dissolving 1g cellulose triacetate in 200 mL of a mixture of dimethyl sulfoxide and acetone at a ratio of 1:2, adding 0.1g K-X type zeolite particles to the mixture, stirring, and subjecting to ultrasonic treatment to obtain a mixtureThe membrane solution of (1); pouring the prepared membrane solution into a mold, drying in an oven at 80 ℃ to completely volatilize the solvent, taking the membrane off, and putting 1 mol L of the membrane solution^-1In potassium hydroxide solution, the decarboxylation reaction is carried out for 6 hours at the temperature of 80 ℃. The 10 percent 200-K-X/cellulose triacetate composite membrane is obtained after washing and drying and is cut into a zinc-silver storage battery diaphragm.

Example 3

The embodiment provides a zinc-silver reserve battery diaphragm, which is formed by embedding hydrophilic porous inorganic particles with the particle size of 200 nanometers into a cellulose triacetate membrane and performing decarboxylation treatment, wherein the using amount of the hydrophilic porous inorganic particles is 30% of the weight of the cellulose triacetate membrane.

The specific preparation process of the zinc-silver storage battery separator in the embodiment is as follows:

adding 200 nm Na-X zeolite to 1 mol L^-1Carrying out ion exchange in potassium hydroxide for three times, and washing and drying to obtain 200 nanometer K-X type zeolite particles; dissolving 1g of cellulose triacetate in 200 mL of mixed solution of dimethyl sulfoxide and acetone in a volume ratio of 1:2, adding 0.3g K-X type zeolite particles into the mixed solution, and carrying out treatments such as stirring and ultrasonic treatment to obtain a uniformly mixed membrane solution; pouring the prepared membrane solution into a mold, drying in an oven at 80 ℃ to completely volatilize the solvent, taking the membrane off, and putting 1 mol L of the membrane solution^-1In potassium hydroxide solution, the decarboxylation reaction is carried out for 6 hours at the temperature of 80 ℃. The composite film is washed and dried to obtain a 30% 200-K-X/cellulose triacetate composite film which is cut to be used as a zinc-silver storage battery diaphragm.

Example 4

The embodiment provides a zinc-silver reserve battery diaphragm, which is formed by embedding hydrophilic porous inorganic particles with the particle size of 50 nanometers into a cellulose triacetate membrane and performing decarboxylation treatment, wherein the using amount of the hydrophilic porous inorganic particles is 10% of the weight of the cellulose triacetate membrane.

The specific preparation process of the zinc-silver storage battery separator in the embodiment is as follows:

50 nm of Na-X zeolite is added in 1 mol L^-1Carrying out ion exchange in potassium hydroxide for three times, and washing and drying to obtain K-X type zeolite particles of 50 nanometers; mixing 1g of cellulose triacetateDissolving element in 200 mL mixed solution of dimethyl sulfoxide and acetone at a volume ratio of 1:2, adding 0.1g K-X type zeolite particles into the mixed solution, stirring, and performing ultrasonic treatment to obtain uniformly mixed membrane solution; pouring the prepared membrane solution into a mold, drying in an oven at 80 ℃ to completely volatilize the solvent, taking the membrane off, and putting 1 mol L of the membrane solution^-1In potassium hydroxide solution, the decarboxylation reaction is carried out for 6 hours at the temperature of 80 ℃. The 10 percent 50-K-X/cellulose triacetate composite membrane is obtained after washing and drying and is cut into a zinc-silver storage battery diaphragm.

Example 5

The embodiment provides a zinc-silver reserve battery diaphragm, which is formed by embedding hydrophilic porous inorganic particles with the particle size of 1000 nanometers into a cellulose triacetate membrane and performing decarboxylation treatment, wherein the using amount of the hydrophilic porous inorganic particles is 10% of the weight of the cellulose triacetate membrane.

The specific preparation process of the zinc-silver storage battery separator in the embodiment is as follows:

adding 1000 nm Na-X zeolite to 1 mol L^-1Carrying out ion exchange in potassium hydroxide for three times, and washing and drying to obtain 1000 nanometer K-X type zeolite particles; dissolving 1g of cellulose triacetate in 200 mL of mixed solution of dimethyl sulfoxide and acetone in a volume ratio of 1:2, adding 0.1g K-X type zeolite particles into the mixed solution, and carrying out treatments such as stirring, ultrasonic treatment and the like to obtain uniformly mixed membrane solution; pouring the prepared membrane solution into a mold, drying in an oven at 80 ℃ to completely volatilize the solvent, taking the membrane off, and putting 1 mol L of the membrane solution^-1In potassium hydroxide solution, the decarboxylation reaction is carried out for 6 hours at the temperature of 80 ℃. The 10 percent 1000-K-X/cellulose triacetate composite membrane is obtained after washing and drying, and is cut to be used as a zinc-silver storage battery diaphragm.

Comparative example 1

Dissolving 1g of cellulose triacetate in 200 mL of mixed solution of dimethyl sulfoxide and acetone in a ratio of 1:2, and carrying out treatment such as stirring and ultrasonic treatment to obtain uniformly mixed membrane solution; pouring the prepared membrane solution into a grinding tool, drying in an oven at 80 ℃ to completely volatilize the solvent, taking the membrane off, and putting 1 mol L of the membrane solution^-1In potassium hydroxide solution, the decarboxylation reaction is carried out for 6 hours at the temperature of 80 ℃. Washing and drying to obtain the triacetic acidThe cellulose composite membrane is cut to be used as a zinc-silver storage battery diaphragm.

The performance tests of the zinc-silver storage battery separators in examples 1 to 5 and comparative example 1 were performed, and the alkali absorption rate, alkali absorption speed, alkali loss rate and tensile strength of each zinc-silver storage battery separator were measured, and the test results are shown in table 1.

The alkali absorption rate is obtained by immersing a dry zinc-silver reserve battery diaphragm into a potassium hydroxide solution with the mass fraction of 40% for 2 hours, weighing, and the ratio of the mass of the absorbed alkali liquor to the mass of the dry film is the alkali absorption rate; the alkali absorption speed is that the lower end of a zinc-silver reserve battery diaphragm with the width of 1 cm is vertically immersed into a potassium hydroxide solution with the mass fraction of 40 percent, and the height of the immersed zinc-silver reserve battery diaphragm from the liquid surface is measured after 5 minutes; the alkali-resistant loss rate is obtained by weighing a zinc-silver reserve battery diaphragm, immersing the diaphragm into a potassium hydroxide solution with the mass fraction of 40% for 2 hours, and then washing and drying, wherein the ratio of the lost mass to the original mass is the alkali-resistant loss rate; the tensile strength is that the diaphragm is cut into strips with the width of 1 cm, the strips are immersed in potassium hydroxide solution with the mass fraction of 40% for 2 hours, the strips are broken by adopting a universal drawing machine, and the ratio of the maximum stress to the cross section is the tensile strength.

According to the performance test results of the zinc-silver reserve battery separators of the examples 1 to 5 and the comparative example 1 in the table 1, compared with the zinc-silver reserve battery separator manufactured by the cellulose triacetate film in the comparative example 1, the zinc-silver reserve battery separators of the examples 1 to 5 are improved in the aspects of alkali absorption rate, alkali resistance, strain strength and the like, wherein the cellulose triacetate film is modified by the K-X zeolite particles of about 200 nanometers in the example 2, the amount of the K-X zeolite is 10% of the weight of the cellulose triacetate film, and the comprehensive performance of the zinc-silver reserve battery separator obtained through decarboxylation treatment is optimal.

Therefore, in the embodiment, the composite membrane prepared by adding the K-X type zeolite into the cellulose triacetate is applied to the zinc-silver reserve battery, and the performances of the diaphragm in the aspects of alkali absorption rate, alkali resistance, strain strength and the like can be obviously improved.

In summary, the preparation method of the zinc-silver reserve battery diaphragm is simple in process, mild in production conditions, low in equipment requirement, safe and reliable in process, low in toxicity and environment-friendly. Compared with a cellulose triacetate film, the zinc-silver reserve battery diaphragm prepared by the method has the advantages that the performances of the diaphragm in the aspects of alkali absorption rate, alkali resistance, strain strength and the like are remarkably improved, and further technical support is provided for the application range expansion of the zinc-silver reserve battery.

The present application has been described with reference to specific examples, which are provided only to aid understanding of the present invention and are not intended to limit the present invention. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.