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Application method of conductive ion gel copolymer in battery cell and battery cell

An application method and ion gel technology are applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., which can solve the problems of changing the mechanical strength of the membrane, difficulty in overcoming, poor mechanical strength, etc., and achieve improved cycle performance and safety performance, Improve the effect of interface and sample integrity

Active Publication Date: 2022-01-07
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, no matter which type of gel polymer electrolyte is mentioned above, it faces insurmountable defects.
For example, if the polymer monomer is at least one of tripropylene glycol diacrylate and pentaerythritol tetraacrylate, the polymer has a single composition and cannot simultaneously solve the large electrochemical potential of the positive electrode and the negative electrode low potential inside the battery. Contradiction Problems Between Decompositions Caused by Potential Difference
However, the porous polymer gel prepared by hydrolysis of polyacrylonitrile has poor mechanical strength. Although the self-supporting microporous gel polymer film can absorb a large amount of electrolyte and exhibit high lithium ion conductivity, the battery will continue to grow in the long run. During the cycle, the polymer film may be partially corroded and dissolved by the electrolyte, which will change the mechanical strength of the film and bring potential danger to the battery.

Method used

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  • Application method of conductive ion gel copolymer in battery cell and battery cell
  • Application method of conductive ion gel copolymer in battery cell and battery cell
  • Application method of conductive ion gel copolymer in battery cell and battery cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] This embodiment provides an application method of an ion-conducting gel copolymer for a battery cell, and the application method is as follows:

[0051] In this embodiment, the positive electrode material is NCM811, the negative electrode material is natural graphite, and the traditional electrolyte is carbonate;

[0052] The traditional liquid homogenate preparation and assembly process is adopted; the gel copolymer precursor solution and the traditional electrolyte are injected into the inside of the cell through a liquid injection machine at a mass ratio of 2:8; the conventional formation process of the liquid battery; the cell after the formation is discharged Put it into a 70°C oven and heat it for 12 hours to obtain an electric core with an ion-conducting gel copolymer coated on the surface of the pole piece;

[0053] Wherein, the preparation method of gel copolymer precursor solution is as follows:

[0054] Stir acrylonitrile, EC, DMC and EMC in a mixer to obtai...

Embodiment 2

[0058] This embodiment provides an application method of an ion-conducting gel copolymer for a battery cell, and the application method is as follows:

[0059] In this embodiment, the positive electrode material is NCM622, and the negative electrode material is a mixed negative electrode of natural graphite and silicon oxygen.

[0060] The traditional liquid homogenate preparation and assembly process is adopted; the gel copolymer precursor solution and the traditional electrolyte are injected into the inside of the cell through a liquid injection machine at a mass ratio of 1:9; the conventional formation process of the liquid battery; the cell after the formation is discharged Put it into a 100°C oven and heat it for 10 hours to obtain an electric core with an ion-conducting gel copolymer coated on the surface of the pole piece;

[0061] Wherein, the preparation method of gel copolymer precursor solution is as follows:

[0062] Stir 3,3-diphenylacrylonitrile, EC, DMC and EMC...

Embodiment 3

[0064] The difference between this example and Example 1 is that the heating temperature after the chemical formation in this example is 40°C.

[0065] All the other preparation methods and parameters are consistent with Example 1.

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Abstract

The invention provides an application method of a conductive ion gel copolymer in a battery cell and the battery cell. The application method comprises the following steps: jointly injecting an electrolyte and a gel copolymer precursor solution in a battery cell liquid injection process, forming and heating to obtain a battery cell of which the surface of a pole piece is coated with the conductive ion gel copolymer. In the preparation process of the battery, the gel copolymer precursor solution is injected while the electrolyte is injected, and the conductive ion gel copolymer is coated on the positive electrode CEI film and the negative electrode SEI film of the battery cell through formation heating, so that the interface of the positive electrode piece and the negative electrode piece of the battery cell is improved, and the rate capability, the cycle performance and the safety performance of the battery cell are remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to an application method of an ion-conducting gel copolymer for a battery cell and a battery cell. Background technique [0002] With the rapid development and progress of society, the problem of energy shortage and environmental pollution is becoming more and more serious, and people are paying more and more attention to the demand for clean energy. At the same time, the increasing popularity of new energy vehicles and the increasing development of energy power have prompted people to develop higher energy density. And high safety lithium-ion battery. At present, lithium-ion power batteries mostly use lithium iron phosphate and ternary materials as the positive pole. However, due to the continuous improvement of energy density and safety performance requirements, it is increasingly necessary to continue to increase energy density under the premise of ensuring safety in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M10/0565H01M10/058H01M50/609
CPCH01M10/0565H01M10/058H01M10/052H01M50/609Y02E60/10Y02P70/50
Inventor 李小栓
Owner SVOLT ENERGY TECHNOLOGY CO LTD