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Lithium ion battery negative electrode polymer binder and preparation method and application thereof

A lithium-ion battery and binder technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of cycle performance deterioration, loss of electrical contact, volume change, etc., to improve cycle stability and maintain structural stability , enhance the effect of cycle performance

Inactive Publication Date: 2021-01-22
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silicon also has some practical application problems in practical applications. In Li + During the embedding and emigration process, silicon will undergo a serious volume change (about 300%), resulting in the destruction of the material structure and mechanical pulverization, leading to the separation between the electrode materials and the electrode material and the current collector, and then losing electrical contact, resulting in a loss of capacity. rapid attenuation, deterioration of cycle performance
Although the mechanical strain caused by the volume change can be effectively relieved after the coating modification of silicon-based materials, due to the inherent volume change of silicon, it will still cause electrode deformation and external battery expansion.
This large variation in cell volume is a major factor limiting the commercialization of silicon-based anode materials

Method used

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  • Lithium ion battery negative electrode polymer binder and preparation method and application thereof
  • Lithium ion battery negative electrode polymer binder and preparation method and application thereof
  • Lithium ion battery negative electrode polymer binder and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] The present embodiment provides a kind of preparation method of polymer binder, and it comprises the following steps:

[0039] a. Add 10 g of starch to 40 mL of deionized water, stir with a magnetic stirrer for 10 min, add 5% NaOH dropwise, adjust the pH to 8, and adjust the temperature of the water bath to 40°C.

[0040] b. Add 0.001g of anhydrous copper sulfate, slowly add 4mL of 30% hydrogen peroxide dropwise, react at a water bath temperature of 40°C for 30min, then add 0.02g of sodium bisulfite, and stir for 10 minutes. Slowly add 5% dilute hydrochloric acid dropwise to adjust the pH of the solution to 5.5-6.0. Suction filtration and dehydration, wash with deionization, put into oven, drying temperature is 40°C, and dry for 6h. The solid was pulverized and ground to obtain a solid powder.

[0041] c. Put 1g of oxidized starch into a three-necked flask, add 50mL of deionized water, stir for 2h, then add 1g of polyacrylic acid, under the protection of Ar gas, adjus...

Embodiment 2

[0049] This example provides a preparation method of the negative electrode binder for lithium ion batteries, which is basically the same as that in Example 1, except that in step (a), the alkaline pH is set to 7.

Embodiment 3

[0051] This example provides a method for preparing a negative electrode binder for lithium ion batteries, which is basically the same as that in Example 1, except that the alkaline pH in step (a) is set to 9.

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Abstract

The invention relates to a lithium ion battery negative electrode polymer binder and a preparation method and application thereof. The preparation method of the adhesive comprises the following steps:preparing oxidized starch (OS) under the oxidation action of hydrogen peroxide under an alkaline condition, and reacting polyacrylic acid (PAA) with the oxidized starch (OS) through a hydroxyl carboxyl dehydration condensation reaction to prepare the OS-PAA. The polymer binder for the negative electrode of the lithium ion battery has a three-dimensional network structure and can relieve a powderfalling phenomenon caused by volume expansion of silicon particles, so the cycle performance of the battery is enhanced.

Description

technical field [0001] The invention relates to a preparation method of a battery binder, in particular to a preparation method of a lithium ion battery negative electrode polymer binder, and belongs to the technical field of lithium ion batteries. Background technique [0002] Silicon is an anode material with great development potential for LIBs, with a theoretical specific capacity as high as 4200mAh g -1 , Li - / Li + The electrochemical potential is between 0-0.4V, and the initial irreversible capacity is smaller than other metal or alloy anode materials. However, silicon also has some practical application problems in practical applications. In Li + During the embedding and emigration process, silicon will undergo a serious volume change (about 300%), resulting in the destruction of the material structure and mechanical pulverization, leading to the separation between the electrode materials and the electrode material and the current collector, and then losing electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/134H01M10/0525C08B31/18
CPCH01M4/622H01M4/134H01M10/0525C08B31/18Y02E60/10
Inventor 任玉荣胡贤超
Owner CHANGZHOU UNIV
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