阅读说明：本技术 一种ZnSnO3纳米棒/RGO复合材料的制备方法及其储能应用 (ZnSnO3Preparation method of nanorod/RGO composite material and energy storage application thereof ) 是由 余佳阁 操京峰 余链 丁瑜 王�锋 杜军 付争兵 于 2021-08-05 设计创作，主要内容包括：本发明属于锂离子电池技术领域,具体公开了一种ZnSnO-(3)纳米棒/RGO复合材料的制备方法及其储能应用。本发明采用微波水热法制备得到了ZnSnO-(3)纳米棒/RGO复合材料,具体方法为：将氢氧化钠、锡源和锌源在冰浴条件下混合,并向其中加入一定量的GO,然后在一定的微波水热条件下得到前驱体ZnSn(OH)-(6)/RGO,再将所得前驱体ZnSn(OH)-(6)/RGO置于管式炉中,在惰性气氛保护下,升温至300-600℃,保温2-10h,得到ZnSnO-(3)纳米棒/RGO复合材料。该ZnSnO-(3)纳米棒/RGO复合材料应用于锂离子电池负极材料后具有极高的容量和很好的循环稳定性,显示出良好的发展前景,该材料在0.1 A·g～(-1)的电流密度下,电化学性能稳定,循环380周后,比容量仍保持在700mAh·g～(-1),库伦效率接近100%。(The invention belongs to the technical field of lithium ion batteries, and particularly discloses ZnSnO 3 A method for preparing a nano-rod/RGO composite material and an energy storage application thereof. The invention adopts a microwave hydrothermal method to prepare ZnSnO 3 The specific method of the nano-rod/RGO composite material is as follows: mixing sodium hydroxide, a tin source and a zinc source under an ice bath condition, adding a certain amount of GO into the mixture, and then obtaining a precursor ZnSn (OH) under a certain microwave hydrothermal condition 6 RGO, and subjecting the resulting precursor to ZnSn (OH) 6 Placing the/RGO in a tube furnace, heating to 600 ℃ under the protection of inert atmosphere, and preserving heat for 2-10h to obtain ZnSnO 3 nanorod/RGO composites. The ZnSnO 3 The nanorod/RGO composite material has extremely high capacity and good cycling stability after being applied to the lithium ion battery cathode material, shows good development prospect, and is 0.1 A.g ‑1 Under the current density of the electrolyte, the electrochemical performance is stable, and after the electrolyte is circulated for 380 weeks, the specific capacity is still maintained at 700mAh g ‑1 Coulombic efficiency approaches 100%.)

1. ZnSnO₃The preparation method of the nanorod/RGO composite material is characterized by comprising the following steps of:

s1, dissolving sodium hydroxide and a tin source in water, stirring for 0.5-1h under an ice bath condition, slowly dropping a zinc source aqueous solution under a continuous stirring condition, pouring a certain amount of GO into a reaction container quickly, continuously stirring the mixed solution under the ice bath condition for 12-24h, transferring the mixed solution into a microwave reactor with the power of 100 and 1000W, heating to 110 and 300 ℃, preserving the temperature for 2-20h to obtain turbid liquid, washing the turbid liquid by deionized water and absolute ethyl alcohol in a centrifugal mode, drying for 12-24h at the temperature of 60-80 ℃ to obtain a precursor ZnSn OH₆/RGO；

S2, preparing ZnSn (OH) as the precursor of S1₆Placing the/RGO in a tube furnace, heating to 300-600 ℃ at a heating rate of 2-20 ℃/min under the protection of inert atmosphere, and preserving heat for 2-10h to obtain ZnSnO₃A nanorod/RGO composite material;

s2 preparation of ZnSnO₃In the nanorod/RGO composite material: ZnSnO₃The diameter of the nano rod is 3-5 nm;

the tin source is at least one of tin dioxide, tin tetrachloride and sodium stannate;

the zinc source is at least one of zinc sulfate, zinc chloride, zinc carbonate, zinc nitrate and zinc oxalate;

the relation between the use amount of the tin source and the GO in the S1 is as follows: 3.6 mmol: (0.1-2) g.

2. The method according to claim 1, wherein GO added in S1 is prepared by classical Hummers method using flake graphite as raw material.

3. The method according to claim 2, wherein in S1: the temperature under ice bath condition is 0-4 ℃; a zinc source: a tin source: the molar ratio of sodium hydroxide is 1: 1: (6.0-6.3); the concentration of the zinc source water solution is 0.1-0.5 mol/L; the dosage ratio of the tin source to the water is 1 mmol: (15-25) mL.

4. The production method according to claim 1, wherein the tin source is tin tetrachloride, the zinc source is zinc sulfate, and the concentration of the aqueous solution of the zinc source is 0.18 mol/L; the purities of the stannic chloride, the zinc sulfate and the sodium hydroxide are not lower than chemical purity; the relation between the consumption of the tin source and GO is as follows: 3.6 mmol: (0.4-2) g.

5. The preparation method according to claim 1, wherein the microwave hydrothermal conditions in S1 are as follows: setting the power at 300W, heating to 120-200 ℃ and preserving the heat for 5-10 h.

6. The preparation method according to claim 5, wherein the microwave hydrothermal conditions in S1 are as follows: setting the power at 300W, heating to 180 ℃, and preserving heat for 5-10 h.

7. The preparation method according to claim 1, wherein the calcination process in S2 is as follows: under the protection of nitrogen, the temperature is raised to 500 ℃ at the temperature raising rate of 2-10 ℃/min, and the temperature is kept for 2-10 h.

8. The process of any of claims 1-7 to make ZnSnO₃The nanorod/RGO composite material is used as a negative electrode material and applied to a lithium ion battery.

9. The application of claim 8, wherein in the specific application, the steps are as follows:

(1) conductive carbon black as conductive agent, polyvinylidene fluoride as binder and ZnSnO as active material₃Mixing the nanorod/RGO composite material in a mass ratio of 20:20:60, dissolving in an N, N-dimethyl pyrrolidone solvent to prepare slurry, coating the slurry on a copper foil, drying, and cutting into electrode slices for later use;

(2) and (3) assembling the positive electrode shell, the electrode plate obtained in the step (1), the diaphragm, the lithium plate, the foamed nickel and the negative electrode shell, adding a proper amount of electrolyte, and packaging to obtain the lithium ion half battery.

10. Use according to claim 9, wherein the separator is Celgard2400 and the electrolyte is 1mol/L LiPF₆/EC-DMC。

Technical Field

The invention belongs to the technical field of lithium ion batteries, and particularly relates to ZnSnO₃A method for preparing a nano-rod/RGO composite material and an energy storage application thereof.

Background

The zinc-tin oxide composite material has high theoretical capacity (1317 mA.h/g) and high lithium ion conductivity (2.5 multiplied by 10)²S/cm), low working potential, rich sources, low price and the like, and is a promising lithium ion battery cathode material. But due to Li⁺The volume change during the insertion/extraction process is large, which may cause the structure to be disassembled, seriously affecting the capacity of the battery. Graphene is taken as one of the best carrier materials, and is reacted with ZnSnO₃The problems are well solved.

Conventional preparation of ZnSnO₃the/RGO composite material is generally prepared by a common hydrothermal method, and obtained cubic particles are large in particle size and easy to agglomerate. When the material is applied to a lithium ion battery cathode material, the material has the problems of unstable structure and poor cycle stability.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide ZnSnO₃A method for preparing a nano-rod/RGO composite material and an energy storage application thereof. The invention adopts a microwave hydrothermal method to successfully obtain ZnSnO₃Nano-rod/RGO composite materialThe material has the characteristics of large specific surface area, uniform appearance and small size, and has extremely high capacity and good cycling stability when being applied to a lithium ion battery cathode material.

In order to achieve the purpose, the invention adopts the following technical scheme:

ZnSnO₃The preparation method of the nanorod/RGO composite material comprises the following steps:

s1, dissolving sodium hydroxide and a tin source in water, stirring for 0.5-1h under an ice bath condition, slowly dropping a zinc source aqueous solution under a continuous stirring condition, pouring a certain amount of GO into a reaction container quickly, continuously stirring the mixed solution under the ice bath condition for 12-24h, transferring the mixed solution into a microwave reactor with the power of 100 and 1000W, heating to 110 and 300 ℃, preserving the temperature for 2-20h to obtain turbid liquid, washing the turbid liquid by deionized water and absolute ethyl alcohol in a centrifugal mode, drying for 12-24h at the temperature of 60-80 ℃ to obtain a precursor ZnSn OH₆/RGO；

S2, preparing ZnSn (OH) as the precursor of S1₆Placing the/RGO in a tube furnace, heating to 300-600 ℃ at a heating rate of 2-20 ℃/min under the protection of inert atmosphere (such as nitrogen and the like), and preserving heat for 2-10h to obtain ZnSnO₃nanorod/RGO composites.

Further, ZnSnO obtained in S2₃In the nanorod/RGO composite material: ZnSnO₃The diameter of the nanorod is 3-5 nm, and the nanorod is rod-shaped ZnSnO₃Uniformly adhered to the sheet RGO.

Further, the tin source is at least one of tin dioxide, tin tetrachloride and sodium stannate; preferably, the tin source is tin tetrachloride.

Further, the zinc source is at least one of zinc sulfate, zinc chloride, zinc carbonate, zinc nitrate and zinc oxalate; preferably, the zinc source is zinc sulfate.

Preferably, the tin source is tin tetrachloride (SnCl)₄·5H₂O), the zinc source is zinc sulfate (ZnSO)₄·7H₂O); the purities of the stannic chloride, the zinc sulfate and the sodium hydroxide are not lower than chemical purity.

Further, the tin source: the molar ratio of the zinc source is 1: 1.

further, the concentration of the zinc source water solution is 0.1-0.5 mol/L; preferably, the concentration of the zinc source aqueous solution is 0.18 mol/L.

Further, the zinc source: a tin source: the molar ratio of sodium hydroxide is 1: 1: (6.0-6.3).

Further, the ratio of the tin source to the water in the S1 is 1 mmol: (15-25) mL.

Further, the relationship between the amount of tin source (Sn) and GO (graphene oxide) in S1 is: 3.6 mmol: (0.1-2) g.

Preferably, the relationship between the amount of tin source (Sn) and GO (graphene oxide) in S1 is: 3.6 mmol: (0.4-2) g.

More preferably, the relationship between the tin source (Sn) and GO (graphene oxide) in S1 is: 3.6 mmol: 0.4 g.

Further, the GO (graphene oxide) added in S1 is prepared by a classical Hummers method by using flake graphite as a raw material, and the added GO (graphene oxide) is thermally reduced to RGO (reduced graphene oxide) in a microwave hydrothermal process.

Preferably, the microwave hydrothermal power in S1 is 300W.

Preferably, the microwave hydrothermal temperature in S1 is 120-200 ℃, and the heat preservation time is 5-10 h.

Most preferably, the microwave hydrothermal temperature in S1 is 180 ℃, and the heat preservation time is 5-10 h.

Further, the temperature in S1 under ice bath conditions was 0 to 4 ℃.

Preferably, the calcination process in S2: heating to 300-500 ℃ at the heating rate of 2-10 ℃/min, and preserving the heat for 2-10 h.

The above ZnSnO₃The nanorod/RGO composite material is used as a negative electrode material and applied to a lithium ion battery. In the specific application, the steps are as follows:

(1) using N, N-dimethyl pyrrolidone as solvent, and mixing conductive carbon black (super-P) as conductive agent, polyvinylidene fluoride (PVDF) as binder, and active material (ZnSnO above)₃Nano rod/RGO composite) is mixed and dissolved in a solvent in a mass ratio of 20:20:60 to prepare a slurry, and then the slurry is coated on a copper foil and is subjected to vacuum condition at 80 DEG CDrying, and cutting into electrode slices for later use;

(2) sequentially stacking the positive electrode shell, the electrode plate obtained in the step (1), a diaphragm, a lithium plate, foamed nickel and the negative electrode shell, adding a proper amount of electrolyte, packaging and assembling to obtain the lithium ion half battery, wherein the battery shell can be CR2016 type, the diaphragm can be Celgard2400, and the electrolyte can be 1mol/L LiPF₆/EC-DMC(1:1)。

Compared with the prior art, the invention has the advantages and beneficial effects that:

the invention obtains ZnSnO by a microwave hydrothermal method₃The nano-rod/RGO composite material has the characteristics of large specific surface area, uniform appearance, small size and stable structure. After being applied to the lithium ion battery cathode material, the material has extremely high capacity and good cycle stability, shows good development prospect, and is 0.1 A.g^-1Under the current density of the electrolyte, the electrochemical performance is stable, and after the electrolyte is circulated for 380 weeks, the specific capacity is still maintained at 700mAh g^-1Coulombic efficiency approaches 100%.

Drawings

FIG. 1 is ZnSnO prepared in example 1 of the present invention₃An X-ray diffraction (XRD) pattern of the nanorod/RGO composite;

FIG. 2 is ZnSnO prepared in example 1 of the present invention₃A Transmission Electron Microscope (TEM) image of the nanorod/RGO composite;

FIG. 3 is ZnSnO prepared in example 1 of the present invention₃The nano rod/RGO composite material is at 0.1 A.g^-1Current density of (a).

Detailed Description

The technical solution of the present invention is further illustrated by the following embodiments in conjunction with the accompanying drawings.

In the following examples and comparative examples, the starting materials used were: SnCl₄·5H₂O、ZnSO₄·7H₂O and sodium hydroxide are analytically pure. The ice bath conditions used were: adding ice blocks into a constant-temperature heating magnetic stirrer (DF-101S, consolidated City instruments Co., Ltd.), and controlling the temperature to be 0 ℃; the microwave reactor used: is a Uwave-2000 multifunctional microwave synthesis extractThe instrument is obtained from Shanghai New Instrument microwave chemical technology Co.

GO manufacturing method reference (Jiage Yu, equivalent. angle structure for the construction of3D TiO)₂nanowires/reduced graphene oxide for high performance lithium/sodium batteries. journal of materials chemistry A,2018,6, 24256.). The method takes crystalline flake graphite as a raw material and adopts a classic Hummers method to prepare GO.

Example 1

1.264g of SnCl at room temperature₄·5H₂O (3.6mmol) and 0.896g NaOH (22.4mmol) were dissolved in 70mL of ultrapure water and stirred continuously at 0 ℃ for 0.5h under ice-bath conditions; then 20mL of 0.18 mol. L were added with continued stirring^-1(3.6mmol) of ZnSO₄·7H₂Slowly dropwise adding an O aqueous solution into a reaction container, quickly pouring 0.4g of GO into the reaction container after dropwise adding, continuously stirring the mixed solution under an ice bath condition for 12 hours, then transferring the mixed solution into a microwave reactor, setting the power to be 300W, heating to 180 ℃, preserving the temperature for 10 hours to obtain a turbid solution, washing the turbid solution by deionized water and absolute ethyl alcohol in sequence for three times in a centrifugal mode, and drying at 80 ℃ for 12 hours to obtain a precursor ZnSn (OH)₆/RGO, reaction of the resulting precursor ZnSn (OH)₆Moving the/RGO into a tube furnace, heating to 500 ℃ at the heating rate of 5 ℃/min in the nitrogen atmosphere, and preserving the heat for 2h to obtain black powder ZnSnO₃the/RGO composite material.

FIG. 1 is ZnSnO prepared in example 1 of the present invention₃X-ray diffraction (XRD) pattern of the/RGO composite material; by comparing PDF cards, the material is ZnSnO₃And RGO; FIG. 2 is ZnSnO prepared in example 1 of the present invention₃Transmission Electron Microscopy (TEM) image of/RGO composite. As can be seen, the rod-shaped ZnSnO having a width of about 5nm₃Uniformly attached to the RGO.

Example 2

1.264g of SnCl at room temperature₄·5H₂Dissolving O and 0.896g NaOH in 70mL of ultrapure water, and continuously stirring for 0.5h under the condition of ice bath at 0 ℃; then 20mL of 0.18 mol. L were added with continued stirring^-1(3.6mmol) of ZnSO₄·7H₂Slowly dripping O aqueous solution into the reaction container, quickly pouring 2g of GO into the reaction container after dripping, continuously stirring the mixed solution for 12h under the ice bath condition, then transferring the mixed solution into a microwave reactor with the power set at 300W, heating to 200 ℃, preserving heat for 8h to obtain turbid solution, washing the turbid solution for three times by deionized water and absolute ethyl alcohol in sequence in a centrifugal mode, and drying for 12h at 80 ℃ to obtain a precursor ZnSn (OH)₆/RGO, reaction of the resulting precursor ZnSn (OH)₆Moving the/RGO into a tube furnace, heating to 600 ℃ at the heating rate of 5 ℃/min in the nitrogen atmosphere, and preserving the heat for 2h to obtain black powder ZnSnO₃the/RGO composite material.

Example 3

1.264g of SnCl at room temperature₄·5H₂Dissolving O and 0.896g NaOH in 70mL of ultrapure water, and continuously stirring for 0.5h under the condition of ice bath at 0 ℃; then 20mL of 0.18 mol. L were added with continued stirring^-1(3.6mmol) of ZnSO₄·7H₂Slowly dropwise adding an O aqueous solution into a reaction container, quickly pouring 0.1g of GO into the reaction container after dropwise adding, continuously stirring the mixed solution under an ice bath condition for 12 hours, then transferring the mixed solution into a microwave reactor, setting the power to be 300W, heating to 250 ℃, preserving the temperature for 6 hours to obtain a turbid solution, washing the turbid solution by deionized water and absolute ethyl alcohol in sequence for three times in a centrifugal mode, and drying at 80 ℃ for 12 hours to obtain a precursor ZnSn (OH)₆/RGO, reaction of the resulting precursor ZnSn (OH)₆Moving the/RGO into a tube furnace, heating to 500 ℃ at the heating rate of 5 ℃/min in the nitrogen atmosphere, and preserving the heat for 2h to obtain black powder ZnSnO₃the/RGO composite material.

Example 4

1.264g of SnCl at room temperature₄·5H₂Dissolving O and 0.896g NaOH in 70mL of ultrapure water, and continuously stirring for 0.5h under the condition of ice bath at 0 ℃; then 20mL of 0.18 mol. L were added with continued stirring^-1(3.6mmol) of ZnSO₄·7H₂Slowly dropwise adding the O aqueous solution into the reaction container, quickly pouring 0.4g of GO into the reaction container after dropwise adding, continuously stirring the mixed solution for 12 hours under the ice bath condition, and then addingTransferring the mixture into a microwave reactor with the set power of 300W, heating to 300 ℃, preserving heat for 5h to obtain turbid liquid, washing the turbid liquid by deionized water and absolute ethyl alcohol respectively in a centrifugal mode for three times, and drying at 80 ℃ for 12h to obtain a precursor ZnSn (OH)₆/RGO, reaction of the resulting precursor ZnSn (OH)₆Moving the/RGO into a tube furnace, heating to 500 ℃ at the heating rate of 2 ℃/min in the nitrogen atmosphere, and preserving the heat for 2h to obtain black powder ZnSnO₃the/RGO composite material.

Example 5

1.264g of SnCl at room temperature₄·5H₂Dissolving O and 0.896g NaOH in 70mL of ultrapure water, and continuously stirring for 0.5h under the condition of ice bath at 0 ℃; then 20mL of 0.18 mol. L were added with continued stirring^-1(3.6mmol) of ZnSO₄·7H₂Slowly dropwise adding an O aqueous solution into a reaction container, quickly pouring 0.4g of GO into the reaction container after dropwise adding, continuously stirring the mixed solution under an ice bath condition for 12 hours, then transferring the mixed solution into a microwave reactor, setting the power to be 300W, heating to 200 ℃, preserving the temperature for 10 hours to obtain a turbid solution, washing the turbid solution by deionized water and absolute ethyl alcohol in sequence for three times in a centrifugal mode, and drying at 80 ℃ for 12 hours to obtain a precursor ZnSn (OH)₆/RGO, reaction of the resulting precursor ZnSn (OH)₆Moving the/RGO into a tube furnace, heating to 500 ℃ at the heating rate of 5 ℃/min in the nitrogen atmosphere, and preserving the heat for 2h to obtain black powder ZnSnO₃the/RGO composite material.

Example 6

1.264g of SnCl at room temperature₄·5H₂Dissolving O and 0.896g NaOH in 70mL of ultrapure water, and continuously stirring for 0.5h under the condition of ice bath at 0 ℃; then 20mL of 0.18 mol. L were added with continued stirring^-1(3.6mmol) of ZnSO₄·7H₂Slowly dripping the O aqueous solution into the reaction container, quickly pouring 0.4g of GO into the reaction container after dripping, continuously stirring the mixed solution for 12 hours under an ice bath condition, then transferring the mixed solution into a microwave reactor, setting the power to be 300W, heating to 120 ℃, preserving the temperature for 10 hours to obtain turbid solution, and sequentially passing the turbid solution through deionized water and anhydrous ethyl acetate in a centrifugal modeWashing with alcohol for three times, and drying at 80 deg.C for 12h to obtain ZnSn (OH) precursor₆/RGO, reaction of the resulting precursor ZnSn (OH)₆Moving the/RGO into a tube furnace, heating to 500 ℃ at the heating rate of 5 ℃/min in the nitrogen atmosphere, and preserving the heat for 2h to obtain black powder ZnSnO₃the/RGO composite material.

Comparative example 1

1.264g of SnCl at room temperature₄·5H₂Dissolving O and 0.896g NaOH in 70mL of ultrapure water, and continuously stirring for 0.5h under the condition of ice bath at 0 ℃; then 20mL of 0.18 mol. L were added with continued stirring^-1(3.6mmol) of ZnSO₄·7H₂Slowly dripping O aqueous solution into the reaction container, after dripping, quickly pouring 0.4g of GO into the reaction container, continuously stirring the mixed solution under the ice bath condition for 12h, then transferring the mixed solution into a hydrothermal kettle, preserving the heat at 180 ℃ for 10h to obtain turbid solution, washing the turbid solution by deionized water and absolute ethyl alcohol in sequence in a centrifugal mode for three times respectively, and then drying at 80 ℃ for 12h to obtain a precursor ZnSn (OH)₆/RGO, reaction of the resulting precursor ZnSn (OH)₆Moving the/RGO into a tube furnace, heating to 500 ℃ at the heating rate of 5 ℃/min in the nitrogen atmosphere, and preserving the heat for 2h to obtain black powder ZnSnO₃the/RGO composite material.

Comparative example 2

1.264g of SnCl at room temperature₄·5H₂Dissolving O and 0.896g NaOH in 70mL of ultrapure water, and continuously stirring for 0.5h under the condition of ice bath at 0 ℃; then 20mL of 0.18 mol. L were added with continued stirring^-1(3.6mmol) of ZnSO₄·7H₂Slowly dripping O aqueous solution into a reaction container, stirring the mixed solution for 12h under an ice bath condition after dripping, transferring the mixed solution into a microwave reactor, setting the power to be 300W, heating to 180 ℃, preserving the temperature for 10h to obtain turbid solution, washing the turbid solution for three times by deionized water and absolute ethyl alcohol in sequence in a centrifugal mode, and drying at 80 ℃ for 12h to obtain a precursor ZnSn (OH)₆The resulting precursor ZnSn (OH)₆Moving to a tube furnace, heating to 500 ℃ at a heating rate of 5 ℃/min in a nitrogen atmosphere, and keeping the temperature for 2h to obtain white powdered ZnSnO₃And (3) nano materials.

A lithium-ion half-cell was assembled from the electrode material obtained in example 1 in the following manner.

N, N-dimethyl pyrrolidone is used as a solvent, conductive carbon black (super-P) serving as a conductive agent, polyvinylidene fluoride (PVDF) serving as a binder and an active material (the material prepared in the embodiment 1) are prepared into slurry according to the mass percentage of 20:20:60, then the slurry is coated on a copper foil, and the copper foil is dried under the vacuum condition at the temperature of 80 ℃ and cut into an electrode slice for later use. And then assembling the electrode plates into the lithium ion half-cell in a glove box. Firstly, a positive electrode shell, the electrode plate, a diaphragm, a lithium plate, foam nickel and a negative electrode shell are sequentially stacked, and are packaged after a proper amount of electrolyte is added. Wherein the battery case is CR2016 type, the diaphragm is Celgard2400, and the electrolyte is 1mol/L LiPF₆/EC-DMC (1:1) (LiPF₆Dissolving ethylene carbonate and dimethyl carbonate according to a volume ratio of 1:1) in the mixed solution).

The battery was charged at 0.1A · g^-1Cycling at current density for 380 cycles resulted in a cycling performance plot, as shown in fig. 3. As can be seen from FIG. 3, the material is 0.1A · g^-1Under the current density of the electrolyte, the electrochemical performance is stable, and after the electrolyte is circulated for 380 weeks, the specific capacity is still maintained at 700mAh g^-1The coulombic efficiency is close to 100%, and the electrochemical stability is excellent.

ZnSnO prepared as in example 1₃Method for preparing electrode and lithium ion half cell from/RGO composite material, preparing electrode and lithium ion half cell from the materials prepared in examples 2-5 and comparative examples 1-2, and preparing ZnSnO prepared in examples 1-5 and comparative example 1₃/RGO composite and ZnSnO prepared in comparative example 2₃The electrochemical properties of the materials respectively constituting the lithium ion half cell are shown in the following table 1:

TABLE 1

As can be seen from Table 1, ZnSnO obtained by microwave hydrothermal method in examples 1 to 6₃the/RGO composite material has excellent electrochemical performance and good electrochemical performanceThe specific discharge capacity is high, the coulombic efficiency is close to 100%, the cycling stability is good, the electrochemical performance is excellent, compared with the comparative example 1 of the traditional hydrothermal method, the specific capacity and the cycling stability are excellent, and the ZnSnO is shown under the microwave hydrothermal condition₃More perfect recombination with RGO can be achieved. The performance of examples 1-6 is better than that of comparative example 2, which shows that RGO material is improving ZnSnO₃Plays a critical role in lithium storage performance. Examples 1-3, which illustrate that when the ratio of tin source (Sn) to GO is 3.6 mmol: the composite material obtained at 0.4g has the best performance. Examples 1, 4, 5, and 6 show that the microwave hydrothermal temperature is preferably 120 ℃ -; when the temperature is too high, ZnSn (OH)₆The larger crystalline particles also result in a composite material with poor structural stability and ultimately poor electrochemical performance.