阅读说明：本技术 一种提高锂电池倍率性能的方法 (A method of improving lithium battery high rate performance ) 是由 王诒永 王娜 于 2019-09-24 设计创作，主要内容包括：本发明公开了锂电池技术领域的一种提高锂电池倍率性能的方法,包括以下步骤：在锂电池电解液中添加稳定剂；在锂电池电解液中再加入适量电容炭；将电解液注入锂电池,在预设时间和温度下活化锂电池；减小锂电池极片厚度,在锂电池的极片中间添加极柱；锂电池封装；锂电池稳固性处理,本发明有效改善大倍率充放电性能以及大倍率循环性能,有利于发挥出锂电池的优异性能。(The invention discloses a kind of methods of raising lithium battery high rate performance of technical field of lithium batteries, comprising the following steps: stabilizer is added in lithium battery electrolytes；Appropriate capacitance carbon is added in lithium battery electrolytes；Inject the electrolyte into lithium battery, preset time and at a temperature of activated lithium battery；Reduce lithium battery pole slice thickness, adds pole among the pole piece of lithium battery；Lithium battery encapsulation；The processing of lithium battery stability, the present invention are effectively improved high rate charge-discharge performance and big circulation performance, are conducive to the excellent properties for playing lithium battery.)

1. a kind of method for improving lithium battery high rate performance, comprising the following steps:

S1: stabilizer is added in lithium battery electrolytes；

S2: appropriate capacitance carbon is added in lithium battery electrolytes；

S3: injecting the electrolyte into lithium battery, preset time and at a temperature of activated lithium battery；

S4: reduce lithium battery pole slice thickness, add pole among the pole piece of lithium battery；

S5: lithium battery encapsulation；

S6: lithium battery stability processing.

2. a kind of method for improving lithium battery high rate performance according to claim 1, it is characterised in that: in S1, stabilizer For the one or more of fluorinated, nitrile and sulfone class organic compound, the additional amount of stabilizer be electrolyte 0.5~ 2.0wt%.

3. a kind of method for improving lithium battery high rate performance according to claim 1, it is characterised in that: in S2, lithium battery For the mechanical mill capacitance carbon of ferric phosphate lithium cell addition 5%, lithium battery is ternary lithium battery addition 5% capacitance carbon of artificial mill.

4. a kind of method for improving lithium battery high rate performance according to claim 1, it is characterised in that: in S4, the pole The fixed addition of column reduces transmission range of the electric current in pole piece at the middle part of pole piece；Reduce lithium battery pole slice thickness, improve lithium from Sub- migration rate.

5. a kind of method for improving lithium battery high rate performance according to claim 1, it is characterised in that: in S3, the work Change lithium battery specifically: follow the static preset time of battery after carrying out several stages under assigned temperature under preset temperature Ring charge and discharge.

6. a kind of method for improving lithium battery high rate performance according to claim 1, it is characterised in that: in S6, stability Processing specifically:, room temperature stand 12h, then 45 DEG C of standing 12h；0.2C constant-current constant-voltage charging 420min, upper limit voltage 3.65V are cut Only electric current 0.05C；Room temperature is stood for 24 hours；Charge and discharge cycles.

Technical field

The present invention relates to technical field of lithium batteries, specially a kind of method for improving lithium battery high rate performance.

Background technique

High-multiplying-power battery is generally referred to as lithium battery, and lithium ion battery is a kind of charging high-multiplying-power battery, it is relied primarily on Movement carrys out work to lithium ion between a positive electrode and a negative electrode.In charge and discharge process, Li+ is embedded in and takes off back and forth between two electrodes Embedding: when rechargable battery, Li+ is embedded in cathode from positive deintercalation, via electrolyte, and cathode is in lithium-rich state；It is then opposite when electric discharge.One As using containing battery of the material as electrode of elemental lithium.Save petroleum resources, reduction of greenhouse gas discharge and air quality purification It is the three challenges that world today's auto industry faces.Power battery technology always is the key for restricting Development of Electric Vehicles, Wherein the research of lithium-ions battery is more paid close attention to and is put into.Application of the lithium-ions battery on electric car is positive to be pushed It develops to safe and environment-friendly, inexpensive and high-energy-density direction.Electric car requires lithium ion battery self discharge rate low, fast Fill that functional, overcharging resisting over-discharge ability is good, power density is high, has extended cycle life.And current battery high rate performance is poor, it is difficult to send out Shoot the excellent properties of lithium battery.

Based on this, the present invention devises a kind of method for improving lithium battery high rate performance, to solve the above problems.

Summary of the invention

The purpose of the present invention is to provide a kind of methods for improving lithium battery high rate performance, to solve in above-mentioned background technique The battery high rate performance of proposition is poor, it is difficult to the problem of playing the excellent properties of lithium battery.

To achieve the above object, the invention provides the following technical scheme: a kind of method for improving lithium battery high rate performance, packet Include following steps:

S1: stabilizer is added in lithium battery electrolytes；

S2: appropriate capacitance carbon is added in lithium battery electrolytes；

S3: injecting the electrolyte into lithium battery, preset time and at a temperature of activated lithium battery；

S4: reduce lithium battery pole slice thickness, add pole among the pole piece of lithium battery；

S5: lithium battery encapsulation；

S6: lithium battery stability processing.

Preferably, in S1, stabilizer is the one or more of fluorinated, nitrile and sulfone class organic compound, stabilizer Additional amount is 0.5~2.0wt% of electrolyte.

Preferably, in S2, lithium battery is the mechanical mill capacitance carbon of ferric phosphate lithium cell addition 5%, and lithium battery is ternary lithium electricity Pond addition 5% capacitance carbon of artificial mill.

Preferably, in S4, the fixed addition of the pole reduces transmission range of the electric current in pole piece at the middle part of pole piece； Reduce lithium battery pole slice thickness, improves lithium ion mobility rate

Preferably, in S3, the activated lithium battery specifically: by the static preset time of battery under preset temperature, carry out After several stages, cycle charge-discharge under assigned temperature.

Preferably, in S6, stability processing specifically:, room temperature stand 12h, then 45 DEG C of standing 12h；0.2C constant current constant voltage Charge 420min, upper limit voltage 3.65V, cut-off current 0.05C；Room temperature is stood for 24 hours；Charge and discharge cycles.

Compared with prior art, the beneficial effects of the present invention are:

The present invention is added into stabilizer by the electrolyte in battery, solves battery flatulence, inhibits positive and negative anodes matrix Be corroded, the electrolyte of battery adds capacitance carbon, changes positive plate active material quality, improve lithium titanate battery cycle life and High rate performance.By reducing pole piece thickness, lithium ion mobility rate is improved, pole is added, reduces transmission of the electric current in pole piece Distance, the improvement constructed to lithium battery itself improve lithium battery high rate performance, by the activation of formation of Li-ion batteries process and firm Property processing, form fine and close and stable cathode SEI film, improve stability, be effectively improved high rate charge-discharge performance and big times Rate cycle performance is conducive to the excellent properties for playing lithium battery.

Detailed description of the invention

In order to illustrate the technical solution of the embodiments of the present invention more clearly, will be described below to embodiment required Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for ability For the those of ordinary skill of domain, without creative efforts, it can also be obtained according to these attached drawings other attached Figure.

Fig. 1 is that lithium battery of the present invention activates schematic diagram；

Fig. 2 is capacitance carbon type schematic diagram of the present invention；

Fig. 3 is that capacitance carbon adding proportion of the present invention tests schematic diagram.

Specific embodiment

Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts all other Embodiment shall fall within the protection scope of the present invention.

Fig. 1-3 is please referred to, the present invention provides a kind of technical solution: a method of lithium battery high rate performance is improved, including Following steps:

S1: stabilizer is added in lithium battery electrolytes；

S2: appropriate capacitance carbon is added in lithium battery electrolytes；

S3: injecting the electrolyte into lithium battery, preset time and at a temperature of activated lithium battery；

S4: reduce lithium battery pole slice thickness, add pole among the pole piece of lithium battery；

S5: lithium battery encapsulation；

S6: lithium battery stability processing.

Wherein, in S1, stabilizer is the one or more of fluorinated, nitrile and sulfone class organic compound, and stabilizer adds Enter 0.5~2.0wt% that amount is electrolyte.In S2, lithium battery is the mechanical mill capacitance carbon of ferric phosphate lithium cell addition 5%, lithium electricity Pond is ternary lithium battery addition 5% capacitance carbon of artificial mill.In S4, the fixed addition of the pole reduces electric current at the middle part of pole piece Transmission range in pole piece；Reduce lithium battery pole slice thickness, improves lithium ion mobility rate.In S3, the activated lithium battery Specifically: by the static preset time of battery under preset temperature, after carrying out several stages, cycle charge discharge under assigned temperature Electricity.In S6, stability processing specifically:, room temperature stand 12h, then 45 DEG C of standing 12h；0.2C constant-current constant-voltage charging 420min, on Voltage limit 3.65V, cut-off current 0.05C；Room temperature is stood for 24 hours；Charge and discharge cycles.

One concrete application of the present embodiment are as follows: the present invention is being melted by adding stabilizer in lithium battery electrolytes Stage sufficiently reacts the moisture in battery material, generates gas and outside batteries are discharged, hindered by special electrolysis additive Only electrolyte is in positive last decomposition, while compound can eliminate the minimum gas of electrolyte decomposition generation, thoroughly solves Battery flatulence problem.Stabilizer can inhibit positive and negative anodes matrix to be corroded with neutralizing acid, to improve lithium titanate battery circulation Service life and high rate performance.

By adding appropriate capacitance carbon in lithium battery electrolytes, lithium battery is that ferric phosphate lithium cell addition 5% is mechanical Capacitance carbon is ground, when adding 5% mechanical mill capacitance carbon, the high rate performance of battery is best, fast with the progress of 5C, 10C and 20C multiplying power It fills when putting fastly, charge specific capacity can achieve 160mAh/g, and the constant current section time is respectively 10min, 6min, 2min, electric discharge Specific capacity can be up to 160mAh/g, 120mAh/g, 80mAh/g respectively；In addition, being put when being discharged with 90C, 100C The electric time is respectively 18s and 12s；

Lithium battery is ternary lithium battery addition 5% capacitance carbon of artificial mill, when adding 5% manually mill capacitance carbon, multiplying power Effect is optimal, and when carrying out fast charging and discharging with 5C, 10C and 20C multiplying power, the constant current section time is respectively 8min, 4min, 2min, Specific discharge capacity can be up to 140mAh/g, 134mAh/g, 120mAh/g respectively；In addition, when being discharged with 90C, 100C, Its discharge time is respectively 17s and 11s.

By injecting the electrolyte into lithium battery, preset time and at a temperature of activated lithium battery, at a temperature of initial preset, Battery is shelved into level-one preset time, keeps internal temperature of battery consistent with initial preset temperature；It is charged using initial preset electric current After so that battery is reached initial preset state-of-charge, transfers battery to and shelve second level preset time under transition preset temperature, make electricity Pond internal temperature is consistent with transition preset temperature；It is charged using transition predetermined current, so that battery is reached transition and preset state-of-charge； Battery is placed at a temperature of middle preset and shelves three-level preset time, keeps internal temperature of battery consistent with middle preset temperature； It is charged using middle preset electric current, so that battery is reached middle preset state-of-charge, finally under ultimate preset temperature, use is ultimate Predetermined current carries out multiple cycle charge-discharge, and lithium ion battery is during circulation, as lithium ion is embedded in cathode, in cathode It will form one layer of densification and stable cathode SEI film, be not only effectively improved high rate charge-discharge performance and big circulation Can, and the lithium in cell positive material can be made sufficiently to participate in being melted into, promote the performance of anode capacity, improves lithium ion The volumetric properties of battery.

By reducing lithium battery pole slice thickness, lithium ion mobility rate is improved；Pole is added among the pole piece of lithium battery, Reduce transmission range of the electric current in pole piece and reduces heat generation simultaneously.After lithium battery encapsulation, it is firm to carry out lithium battery Property processing, room temperature stands 12h, then 45 DEG C of standing 12h；0.2C constant-current constant-voltage charging 420min, upper limit voltage 3.65V, cut-off electricity Flow 0.05C；Room temperature is stood for 24 hours；Charge and discharge cycles.Stability difference is the major reason of hypovolemic difference, and volumetric properties are poor, battery It is not up to stability, the stability of battery is improved simultaneously in raising lithium battery high rate performance, keeps lithium battery equalization performance superior, have It is used for a long time conducive to lithium battery.

The present invention is added into stabilizer by the electrolyte in battery, solves battery flatulence, inhibits positive and negative anodes matrix Be corroded, the electrolyte of battery adds capacitance carbon, changes positive plate active material quality, improve lithium titanate battery cycle life and High rate performance.By reducing pole piece thickness, lithium ion mobility rate is improved, pole is added, reduces transmission of the electric current in pole piece Distance, the improvement constructed to lithium battery itself improve lithium battery high rate performance, by the activation of formation of Li-ion batteries process and firm Property processing, form fine and close and stable cathode SEI film, improve stability, be effectively improved high rate charge-discharge performance and big times Rate cycle performance.

In the description of this specification, the description of reference term " one embodiment ", " example ", " specific example " etc. means Particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained at least one implementation of the invention In example or example.In the present specification, schematic expression of the above terms may not refer to the same embodiment or example. Moreover, particular features, structures, materials, or characteristics described can be in any one or more of the embodiments or examples to close Suitable mode combines.

Present invention disclosed above preferred embodiment is only intended to help to illustrate the present invention.There is no detailed for preferred embodiment All details are described, are not limited the invention to the specific embodiments described.Obviously, according to the content of this specification, It can make many modifications and variations.These embodiments are chosen and specifically described to this specification, is in order to better explain the present invention Principle and practical application, so that skilled artisan be enable to better understand and utilize the present invention.The present invention is only It is limited by claims and its full scope and equivalent.