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Preparation method of lithium ion battery gel electrolyte and lithium ion battery containing gel electrolyte

A gel electrolyte and lithium-ion battery technology, applied in the field of lithium-ion batteries, can solve problems such as poor electrochemical performance and poor safety performance, and achieve the effects of low cost, simple process, and easy mass production

Active Publication Date: 2013-01-30
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the polymer gel electrolytes that have been industrialized include in-situ gel method and coating hot pressing method: the former mainly mixes polymer monomers into the liquid electrolyte and adds them to the battery cell by pouring. Then polymerize inside the battery to form a gel electrolyte. The battery prepared by this method often has better safety and poor electrochemical performance; Coated on the surface of the electrode diaphragm, then wound, put into the bag (shell), and finally the polymer electrolyte was permeated into the micropores of the electrode sheet by high temperature hot pressing to obtain the gel electrolyte cell. The cell prepared by this method Cores tend to have better electrochemical performance and poor safety performance

Method used

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  • Preparation method of lithium ion battery gel electrolyte and lithium ion battery containing gel electrolyte

Examples

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Effect test

Embodiment 1

[0053] Preparation of gel electrolyte: Weigh the following components according to the following mass relationship for use: E1: PVDF: methyl methacrylate: trimethylolpropane triacrylate: dibenzoyl peroxide is 99.979:0.05:0.05:0.1 : 0.001; Add the weighed PVDF into the weighed E1, fully stir until it is evenly dispersed in E1, then add the weighed methyl methacrylate and trimethylolpropane triacrylate, fully Stir to obtain a prepolymer gel electrolyte, and finally, add a weighed initiator dibenzoyl peroxide within one month before use, and stir thoroughly to obtain a ready-to-use gel electrolyte.

[0054] Preparation of battery cell to be filled with liquid: same as Comparative Example 1.

[0055] Injection and cell molding: inject the above-mentioned gel electrolyte into the battery cell after Baking, then seal it, and let it stand until the electrolyte fully infiltrates the entire diaphragm; then apply a pressure of 10MPa on the surface of the cell, and place the cell at 150 ...

Embodiment 2

[0057] Preparation of gel electrolyte: Weigh the following components according to the following mass relationship: E1: SBR: ethyl acrylate: propoxylated trimethylolpropane triacrylate: peroxydicarbonate is 74.95:10:10: 0.05:5; Add the weighed SBR into the weighed E1, stir well until it is evenly dispersed in E1, then add the weighed ethyl acrylate and propoxylated trimethylolpropane triacrylic acid ester, fully stirred to obtain a pre-polymer gel electrolyte, and finally, a weighed initiator peroxydicarbonate was added within one month before use, and fully stirred to obtain a ready-to-use gel electrolyte.

[0058] Preparation of battery cell to be filled with liquid: same as Comparative Example 1.

[0059] Injection and cell molding: inject the above-mentioned gel electrolyte into the battery cell after Baking, then seal it, and let it stand until the electrolyte fully infiltrates the entire diaphragm; then apply a pressure of 0.001MPa on the surface of the cell, and place t...

Embodiment 3

[0061] Preparation of gel electrolyte: Weigh the following components according to the following mass relationship for use: E1: PVDF: lauryl acrylate: ethoxylated trimethylolpropane triacrylate: dibenzoyl peroxide is 94.8:2: 2:1:0.2; Add the weighed PVDF into the weighed E1, stir well until it is evenly dispersed in E1, then add the weighed lauryl acrylate and ethoxylated trimethylol Propane triacrylate, fully stirred to obtain a prepolymer gel electrolyte, and finally, a weighed initiator dibenzoyl peroxide was added within two days before use, and fully stirred to obtain a ready-to-use gel electrolyte.

[0062] Preparation of battery cell to be filled with liquid: same as Comparative Example 1.

[0063] Injection and cell molding: inject the above-mentioned gel electrolyte into the battery cell after Baking, then seal it and let it stand until the electrolyte fully infiltrates the entire diaphragm; then apply a pressure of 0.6 MPa on the surface of the cell, and place the ce...

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Abstract

The invention discloses a preparation method of a lithium ion battery gel electrolyte and a lithium ion battery containing the gel electrolyte, the gel electrolyte comprises a liquid state electrolyte, a polymer component and an initiator, the polymer component contains three types of molecules of A, B and C, wherein the type A molecule is a high liquid state electrolyte adsorption capability polymer, the type B molecule is no more than two of monomers of reaction activity function group, and the type C molecule is more than or equal to three monomers of the reaction activity function group. Compared with the prior art, the three types of molecules of A, B and C in the gel electrolyte enable coexistence, by controlling the gel condition, a pig-cage structure which takes the type C molecule as a center and the type B molecule (or after polymerization) is connected in the gel is formed, the pig-cage structure can lock the gel electrolyte containing the liquid state electrolyte after the type A molecule absorbs the electrolyte inside the pig-cage structure, thereby the gel electrolyte possessing high stereoscopic effect as well as excellent electrochemical performance and safety performance.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a lithium ion battery gel electrolyte and a preparation method for a lithium ion battery containing the gel electrolyte. Background technique [0002] In 1991, Sony Corporation of Japan creatively adopted carbon materials as the anode material of lithium-ion batteries, which brought revolutionary changes in the field of lithium-ion batteries; And a lot of use on other portable electrical appliances. Lithium-ion batteries have many advantages, such as high voltage, small size, light weight, high specific capacity, no memory effect, no pollution, small self-discharge, long cycle life, etc. It is an ideal power source for mobile appliances and electric vehicles in the 21st century. Power supply and electric storage for storage power station. However, lithium batteries used in electric vehicles (EV) and energy storage power stations (ES) have higher capacity and larger volume. ...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/058
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 游从辉江辉俢倩孙成栋郑义
Owner DONGGUAN AMPEREX TECH
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