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A kind of negative electrode polymer protective coating of lithium ion battery and its preparation method and application

A lithium-ion battery, protective coating technology, applied in electrode current collector coating, electrode manufacturing, battery electrodes and other directions, can solve the problems of battery capacity decay, consumption of lithium ions, easy damage of negative electrode SEI layer, etc., to reduce damage , easy industrialization, excellent electrochemical stability

Active Publication Date: 2022-03-18
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the problem that the SEI layer of the negative electrode is easily damaged during the charge and discharge process of the lithium ion battery, consume a large amount of lithium ions, and cause the rapid decline in battery capacity, the present invention provides a lithium ion battery that can absorb transition metal ions and is beneficial to conduct lithium ions Negative Polymer Protective Coating

Method used

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  • A kind of negative electrode polymer protective coating of lithium ion battery and its preparation method and application
  • A kind of negative electrode polymer protective coating of lithium ion battery and its preparation method and application
  • A kind of negative electrode polymer protective coating of lithium ion battery and its preparation method and application

Examples

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Effect test

Embodiment 1

[0042] (1) According to figure 1 For the polymer synthesis mechanism shown, MDI (4,4'-methylene diphenyl diisocyanate) (20 mmol) and PTMG (polytetrahydrofuran, Mw=2900 ) (10mmol), heated at 80°C for 4h under the protection of an inert argon atmosphere to form an isocyanate-terminated PTMG intermediate;

[0043] (2) After cooling to room temperature, add EDA (ethylenediamine) (8mmol) into the solution under vigorous stirring, heat the mixture to 70°C and react for 4h, and then mix in a certain amount of PEI (polyethyleneimine) , mixed evenly for 2h. Finally, the polymer solution was poured into a polytetrafluoroethylene mold, and the solvent was evaporated at 60° C. to obtain a lithium-ion battery negative electrode polymer protective coating with a thickness of 500 μm.

[0044] Electrolyte swelling degree: Cut the above lithium-ion battery anode polymer protective coating into blocks, and accurately weigh its mass w 0 . The film was transferred to an electrolyte solution (...

Embodiment 2

[0051] (1) With reference to Example 1, polyethylene glycol containing terminal isocyanate is prepared, and then polyethylene glycol (segment A) and polyphenylenediamine (segment B) containing terminal isocyanate are combined according to the ratio of isocyanate and active amino group After the molar ratio of the groups is 1:1, the condensation reaction occurs at 55°C to obtain the polymer;

[0052] (2) Dissolving the polymer in N-methylpyrrolidone to prepare a polymer solution with a concentration of 5w%;

[0053] (3) Prepare lithium-ion battery negative electrode slurry, apply it on the copper foil substrate to obtain electrode sheet E1, and roll it once to obtain a porosity of 25% and a compacted density of 1.50 g cm -3 The electrode sheet E2;

[0054] (4) The polymer solution obtained in step (2) is coated on the electrode sheet E2 through an extrusion coating machine, and after drying, it is rolled twice to obtain a compacted density of 1.65 g cm -3 The electrode sheet ...

Embodiment 3

[0057] (1) Referring to Example 1, the polypropylene glycol containing terminal isocyanate is prepared, and then the polypropylene glycol (segment A) containing terminal isocyanate and polyethyleneimine-polyphenylenediamine front-end copolymer (segment B) are prepared according to the isocyanate After mixing with active amino groups at a molar ratio of 1:1.05, a condensation reaction occurs at 40°C to obtain a polymer;

[0058] (2) dissolving the polymer in N,N-dimethylacetamide to prepare a polymer solution with a concentration of 10w%;

[0059] (3) Prepare lithium-ion battery negative electrode slurry, apply it on the copper foil substrate to obtain electrode sheet E1, and roll it once to obtain a porosity of 25% and a compacted density of 1.40 g cm -3 The electrode sheet E2;

[0060] (4) Transfer and coat the polymer solution obtained in step (2) onto the electrode sheet E2, after drying, roll it twice to obtain a compacted density of 1.55 g cm -3 The electrode sheet E3, ...

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Abstract

The invention relates to the technical field of lithium-ion batteries. In order to solve the problem that the SEI layer of the negative electrode of the lithium-ion battery is easily damaged during the charging and discharging process, a large amount of lithium ions are consumed, and the battery capacity is rapidly attenuated, a polymer protective coating for the negative electrode of the lithium-ion battery is provided. Layer and its preparation method and application, the negative electrode polymer protective coating of the lithium ion battery includes a polymer, and the polymer is obtained by a condensation reaction between a segment A and a segment B; the segment A has a terminal isocyanate; The segment B has a terminal reactive amino group. The polymer protective coating of the present invention has certain ionic conductivity, electrochemical stability and excellent elasticity, and the polymer layer can absorb a certain amount of transition metal ions, reduce the damage of transition metal ions to the SEI layer, and can stabilize the negative electrode The SEI layer improves the cycle stability, cycle life and high temperature storage characteristics of lithium-ion batteries.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a lithium-ion battery negative electrode polymer protective coating and a preparation method and application thereof. Background technique [0002] With the steady growth of the 3C market, the popularization of the electric vehicle market and the huge energy storage demand of the smart grid, lithium-ion batteries have the characteristics of high working voltage, high specific capacity, high energy density and long cycle life, so lithium-ion batteries have become the most popular in the world today. Promising chemical power sources and energy storage devices. Soft-pack batteries have the advantages of flexible design, light packaging and no explosion, and are gradually being favored by the market. In order to further improve the cruising range of electric vehicles and the standby time of mobile electronic products, it is necessary to further develop new lithium-ion ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/08C09D175/04C09D5/24H01M4/04H01M4/13H01M4/139H01M10/0525
CPCC09D175/08C09D175/04C09D5/24H01M4/13H01M4/139H01M4/0404H01M10/0525Y02E60/10
Inventor 黄清泉项青李慧
Owner WANXIANG 123 CO LTD
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