Preparation method of adhesive for improving cycling stability of silicon electrode of lithium battery

A cycle stability and binder technology, applied to battery electrodes, circuits, electrical components, etc., can solve problems such as capacity deterioration, wide molecular weight distribution, and increased battery internal resistance, so as to maintain stable electrode structure and facilitate cycle stability Sexuality, the effect of preventing movement

Active Publication Date: 2018-05-22
宁波喵走科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The general problem of the current polyvinylidene fluoride lithium battery binder products on the market is that the molecular weight distribution is wide. Judging from the viscosity of PVDF solution with the same percentage content, the narrow molecular weight distribution has a relatively high viscosity, that is to say Has relatively high adhesive properties
In addition, polyvinylidene fluoride is a semi-crystalline polymer, the crystallinity is generally about 40%, and the crystallization temperature is around 140°C. Regarding the crystallinity of PVDF, on the one hand, the higher the crystallinity, the more difficult it...

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method of a binder for improving the cycle stability of a silicon electrode of a lithium battery, the specific method comprising preparing cobalt molybdate mesh nanosheets, wherein the cobalt molybdate mesh nanosheets are formed by cobalt molybdate nanosheets intersecting and growing vertically on the The cobalt molybdate network nanosheet array formed on the foam nickel, and then the graphene film is wrapped on the surface of the cobalt molybdate nanosheet array, and the graphene and cobalt molybdate network in the graphene-coated cobalt molybdate network nanosheet The weight ratio of the nanosheets was 1:1, and they were placed for 3 months until their molecules penetrated each other; the prepared graphene-coated cobalt molybdate mesh nanosheets were taken out, and acrylic acid, carboxymethyl cellulose and light were added to them. The initiator is stirred and mixed evenly with a glass rod rubbed with silk to form a mixed solvent for use; add deionized wa...

Embodiment 2

[0035] A preparation method of a binder for improving the cycle stability of a silicon electrode of a lithium battery, the specific method comprising preparing cobalt molybdate mesh nanosheets, wherein the cobalt molybdate mesh nanosheets are formed by cobalt molybdate nanosheets intersecting and growing vertically on the The cobalt molybdate network nanosheet array formed on the foam nickel, and then the graphene film is wrapped on the surface of the cobalt molybdate nanosheet array, and the graphene and cobalt molybdate network in the graphene-coated cobalt molybdate network nanosheet The weight ratio of nanosheets was 1:2, and they were placed for 4 months until their molecules penetrated each other; the graphene-coated cobalt molybdate mesh nanosheets were taken out, and acrylic acid, carboxymethyl cellulose and light were added to them. The initiator is stirred and mixed evenly with a glass rod rubbed with silk to form a mixed solvent for use; add deionized water to the ab...

Embodiment 3

[0043] A preparation method of a binder for improving the cycle stability of a silicon electrode of a lithium battery, the specific method comprising preparing cobalt molybdate mesh nanosheets, wherein the cobalt molybdate mesh nanosheets are formed by cobalt molybdate nanosheets intersecting and growing vertically on the The cobalt molybdate network nanosheet array formed on the foam nickel, and then the graphene film is wrapped on the surface of the cobalt molybdate nanosheet array, and the graphene and cobalt molybdate network in the graphene-coated cobalt molybdate network nanosheet The weight ratio of nanosheets was 1:3, and they were placed for 5 months until their molecules penetrated each other; the prepared graphene-coated cobalt molybdate mesh nanosheets were taken out, and acrylic acid, carboxymethyl cellulose and light were added to them. The initiator is stirred and mixed evenly with a glass rod rubbed with silk to form a mixed solvent for use; add deionized water ...

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PUM

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Abstract

The invention discloses a preparation method of an adhesive for improving cycling stability of a silicon electrode of a lithium battery, which comprises the following steps that acrylic acid, deionized water, graphene coated cobalt molybdate reticulate nanosheets, carboxymethyl cellulose and a photoinitiator are uniformly mixed and then are directly ultraviolet light cross-linked through an in-situ polymerization method, so that the adhesive containing a polyacrylic acid grafted carboxymethyl cellulose copolymer is obtained. According to the preparation method disclosed by the invention, the graphene coated cobalt molybdate reticulate nanosheets are added into the adhesive, and the network structure of the material is utilized, so that the nano silicon particles can be effectively prevented from moving in the circulation process, the electrode structure is kept stable, and the cycling stability of the electrode is facilitated.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a lithium battery binder, in particular to a preparation method of a binder for improving the cycle stability of a silicon electrode of a lithium battery. Background technique [0002] Lithium-ion batteries are currently one of the most extensively researched and in-depth energy storage devices. Because of their advantages such as high capacity density, high cycle life, environmental protection, wide operating temperature range and high safety performance, they are widely used in smartphones, Tablet PCs, electric vehicles and other fields. The mechanical properties of the binder are closely related to the cycle life of the battery. If the mechanical properties are not good, it is easy to cause the electrode sheet to pulverize during the electrochemical cycle, causing the electrode material to fall off the surface of the current collector and lose the electrochemical energy storag...

Claims

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Application Information

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IPC IPC(8): H01M4/62
CPCH01M4/622H01M4/625Y02E60/10
Inventor 陈庆司文彬
Owner 宁波喵走科技有限公司
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