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A polyunsaturated carboxylic acid group controllable cross-linking binder and a lithium ion battery containing the binder

A binder and unsaturated technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of complex batching process and reduced binder solubility, and achieve excellent adhesion and reduce slippage

Active Publication Date: 2022-05-06
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the current technology, most of the cross-linked adhesives obtained by in-situ polymerization of acrylic-based monomers and diolefin derivative cross-linking agents are easy to gel. , there will be problems such as reduced binder solubility and complex batching process

Method used

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  • A polyunsaturated carboxylic acid group controllable cross-linking binder and a lithium ion battery containing the binder
  • A polyunsaturated carboxylic acid group controllable cross-linking binder and a lithium ion battery containing the binder
  • A polyunsaturated carboxylic acid group controllable cross-linking binder and a lithium ion battery containing the binder

Examples

Experimental program
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Effect test

preparation example Construction

[0084] [Preparation of pole piece]

[0085] The present invention also provides a preparation method for the above-mentioned pole piece, which includes:

[0086] a) preparing the binder system, including: preparing a matrix component, which is an unsaturated carboxylic acid-based polymer; preparing a doping component, which is a bisoxazoline small molecular.

[0087] In a specific embodiment, the preparation method of the pole piece includes the following steps:

[0088] a) preparing the binder system, including: preparing a matrix component, which is an unsaturated carboxylic acid-based polymer; preparing a doping component, which is a bisoxazoline small molecular;

[0089] b) uniformly mixing the active material, the conductive agent, and the binder system in step a) to obtain a slurry;

[0090]c) coating the slurry in step b) on at least one surface of the current collector, and drying to obtain the pole piece.

[0091] In a specific embodiment, the pole piece is a pos...

Embodiment 1

[0118] Preparation of the binder system:

[0119] Take 10g of acrylic acid and disperse it in 190g of deionized water, stir it mechanically at 800rpm, raise the temperature to 40°C, keep it warm for 30min, blow in nitrogen, add 0.05g of sodium persulfate and 0.2g of sodium bisulfite, and continue the reaction for 10h. After the reaction, cool down to 30°C to obtain an unsaturated carboxylic acid-based polymer, then add 2g of the bisoxazoline small molecule shown in formula (II), and stir mechanically at 500rpm for 30min to obtain a binder system with a viscosity of 3500mPa ·s.

[0120] The prepared unsaturated carboxylic acid-based polymer was characterized, and the weight-average molecular weight was 1 million; the decomposition temperature was 325° C. (TG test), and the glass transition temperature was 106° C. (DSC test).

[0121] Preparation of the negative electrode sheet: the negative electrode active material silicon-based / graphite composite negative electrode material ...

Embodiment 11

[0125] The difference from Example 1 is that the amount of bisoxazoline small molecules added is 1 g, and other conditions are the same.

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PUM

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Abstract

The invention provides a polyunsaturated carboxylic acid group controllable cross-linking binder and a lithium ion battery containing the binder. The binder of the present invention is formed through the crosslinking of linear unsaturated carboxylic acid-based polymers and bisoxazoline small molecules in a drying process. The cross-linked unsaturated carboxylic acid-based polymer forms a three-dimensional network, which can fully cover the active material and reduce the slip between active material particles; in addition, the cross-linked unsaturated carboxylic acid-based polymer can provide more functions site, so that the polyunsaturated carboxylic acid group controllable cross-linking binder of the present invention has excellent binding force, and the cycle performance, expansion rate and rate performance of the lithium ion battery using the binder are also excellent Lithium-ion batteries with non-crosslinked binders.

Description

technical field [0001] The invention relates to a polyunsaturated carboxylic acid-based controllable cross-linking binder and a lithium ion battery containing the binder, belonging to the technical field of lithium ion batteries, in particular to the field of binders for lithium ion batteries. Background technique [0002] As a kind of polymer, the binder in lithium-ion batteries not only plays the role of bonding between the active material layers, but also can be used for the bonding between the active material layer and the pole sheet substrate. It plays an important role and is one of the important components of the battery. [0003] The most widely used binders are polyvinylidene fluoride (PVDF), copolymers of styrene and butadiene (SBR), and polyacrylic acid (ester) binders. Among them, the polyacrylic acid (ester)-based binder has abundant carboxyl groups, which can react with the hydroxyl groups on the active material and the pole piece to improve the peel strength....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/622H01M10/0525Y02E60/10
Inventor 储霖李素丽陈伟平李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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