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A composite binder of silicon carbon negative electrode material for lithium ion battery and its preparation method and application

A lithium-ion battery and negative electrode material technology, which is applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of negative electrode material pulverization, poor mechanical properties, battery failure, etc., achieve low cost, convenient operation, and avoid falling off Effect

Active Publication Date: 2022-07-08
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when this type of material is used alone as a binder, due to its poor mechanical properties, irreversible sliding occurs on the surface of the electrode material after multiple charge-discharge cycles, resulting in powdering and peeling of the negative electrode material, and eventually leading to battery failure.

Method used

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  • A composite binder of silicon carbon negative electrode material for lithium ion battery and its preparation method and application
  • A composite binder of silicon carbon negative electrode material for lithium ion battery and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0019] The preparation method of the silicon-carbon negative electrode material composite binder of the present embodiment is as follows:

[0020] (1) Take 2 g of polyacrylamide with a molecular weight of 45 W, add it to 20 mL of 10 wt% sodium hydroxide aqueous solution, stir at a speed of 100-500 rpm, and fully dissolve it for 5 h at room temperature;

[0021] (2) Take 0.1 g of 1,4-butanediol diglycidyl ether, add it to the above solution, and fully react for 2 h at a stirring speed of 100~500 rpm and 35 °C;

[0022] (3) The mass ratio of polyacrylamide:1,4-butanediol diglycidyl ether is 1:0.05;

[0023] (4) After the reaction, dialyze to neutrality in a dialysis bag, and dry at 70°C in vacuum. The product is configured into a 10 wt% aqueous solution to obtain a composite binder;

[0024] Take the binder prepared above. According to the ratio of active material: binder: conductive agent = 8: 1: 1, weigh 0.8 g of silicon carbon anode material, 0.1 g of conductive agent SP, ...

Embodiment 2

[0027] The preparation method of the silicon-carbon negative electrode material composite binder of the present embodiment is as follows:

[0028] (1) Take 2 g of polyacrylamide with a molecular weight of 45 W, add it to 20 mL of 30 wt% sodium hydroxide aqueous solution, stir at a speed of 100-500 rpm, and fully dissolve it for 5 h at room temperature;

[0029] (2) Take 0.2 g of epichlorohydrin, add it to the above solution, and fully react for 3 hours at a stirring speed of 100~500 rpm and 30 °C;

[0030] (3) The mass ratio of polyacrylamide: epichlorohydrin is 1:0.1;

[0031] (4) After the reaction, dialyze to neutrality in a dialysis bag, and dry at 70°C in vacuum. The product is configured into a 10 wt% aqueous solution to obtain a composite binder;

[0032] Take the composite binder prepared above. According to the ratio of active material: binder: conductive agent = 8: 1: 1, weigh 0.8 g of silicon carbon anode material, 0.1 g of conductive agent SP, and 0.1 g of compo...

Embodiment 3

[0035] The preparation method of the composite binder for the silicon carbon negative electrode material of the present embodiment is as follows:

[0036] (1) Take 2 g of polyethyleneimine with a molecular weight of 45 W, add it to 20 mL of 30 wt% sodium hydroxide aqueous solution, stir at a speed of 100-500 rpm, and fully dissolve it for 5 h at room temperature;

[0037] (2) Take 0.2 g of epichlorohydrin, add it to the above solution, and fully react for 3 h at a stirring speed of 100-500 rpm and 30 °C;

[0038](3) The mass ratio of polyethyleneimine: epichlorohydrin is 1:0.1;

[0039] (4) After the reaction, dialyze to neutrality in a dialysis bag, and dry at 70°C in vacuum. The product is configured into a 10 wt% aqueous solution to obtain a composite binder;

[0040] Take the composite binder prepared above. According to the ratio of active material: binder: conductive agent = 8: 1: 1, weigh 0.8 g of silicon carbon anode material, 0.1 g of conductive agent SP, and 0.1 g...

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Abstract

The invention discloses a composite binder of silicon carbon negative electrode material of lithium ion battery, its preparation method and application. The epoxy group of the cross-linking agent is cross-linked with the amino group to form a network structure, and the hydrogen bond combined with the amino group is effectively combined with the silicon anode material; the addition of the dispersant enhances the dispersibility of the binder in the slurry. The composite binder can effectively alleviate the volume expansion of the silicon carbon anode material during the charge and discharge process, and is beneficial to improve the first Coulomb efficiency and cycle life of the anode material. The preparation method of the binder is simple in operation, low in cost, easy to realize large-scale production, and has good market application value.

Description

technical field [0001] The invention belongs to the field of lithium ion battery binders, and particularly relates to a composite binder of silicon carbon negative electrode materials for lithium ion batteries, a preparation method thereof, and applications in lithium ion batteries. Background technique [0002] In recent years, the rapid development of electric bicycles and electric vehicles has put higher requirements on the high-rate fast charging and discharging capabilities and long-term battery life of power batteries. Lithium-ion battery anode materials play a decisive role in the battery performance and commercialization process as the main body of lithium storage. The traditional lithium-ion battery anode material graphite (theoretical specific capacity 372 mAh / g) has been difficult to meet the increasing requirements of energy and power density. Among various anode materials, silicon has become a promising anode material to replace graphite because it has the high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/622H01M10/0525H01M2004/027Y02E60/10
Inventor 洪若瑜林松王芳芳
Owner FUZHOU UNIV
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