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Adhesive for silicon-carbon negative electrode and electrode material for lithium ion battery

An electrode material and adhesive technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of inability to maintain the electrical contact of alloy particles, decrease in cycle capacity, reduce battery capacity, etc., and improve Coulombic efficiency. and cycle stability, improved adhesion, and improved structural stability

Active Publication Date: 2021-10-26
浙江中科玖源新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The PVDF binder is easy to swell in the electrolyte and cannot maintain the electrical contact between the alloy particles well, resulting in electrode failure and a sharp drop in cycle capacity
The mixed aqueous solution of SBR and CMC has the defect of reducing the battery capacity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Preparation of binder for silicon carbon negative electrode and electrode material for lithium ion battery:

[0023] Under nitrogen protection, add 4.32g (20mmol) 3,3'-dihydroxybenzidine (p-HAB) into 50mL N-methylpyrrolidone (NMP) and stir to dissolve completely, then add 6.20g (20mmol) 3,3' , 4,4'-diphenyl ether tetracarboxylic dianhydride (ODPA), after stirring and reacting for 12 hours, a polyamic acid solution was obtained;

[0024] Add 0.24g (10mmol) lithium hydroxide (LiOH) into 5mL deionized water to dissolve completely, then add it to the above polyamic acid solution, stir and react for 6 hours to form polyamic acid salt, which is the bonding agent for the silicon carbon negative electrode. agent.

[0025] Stir and mix 5g of the above-mentioned silicon-carbon negative electrode binder (adding NMP to adjust the solid content to 10wt%) and 4g of silicon-carbon electrode active material (graphite and nano-silicon powder with a mass ratio of 1:1), and then add ...

Embodiment 2

[0033] (1) Preparation of binder for silicon carbon negative electrode and electrode material for lithium ion battery:

[0034] Under nitrogen protection, 2.16g (10mmol) 3,3'-dihydroxybenzidine (p-HAB), 2.00g (10mmol) 4,4'-diaminodiphenyl ether (ODA) were added to 50mL N-methyl Stir and dissolve pyrrolidone (NMP) completely, then add 6.20g (20mmol) 3,3',4,4'-biphenyltetracarboxylic dianhydride (BPDA), and stir for 12 hours to obtain a polyamic acid solution;

[0035] Add 0.24g (10mmol) lithium hydroxide (LiOH) into 5mL deionized water to dissolve completely, then add it to the above polyamic acid solution, stir and react for 6 hours to form polyamic acid salt, which is the bonding agent for the silicon carbon negative electrode. agent.

[0036] Stir and mix 5g of the above-mentioned silicon-carbon negative electrode binder (adding NMP to adjust the solid content to 10wt%) and 4g of silicon-carbon electrode active material (graphite and nano-silicon powder with a mass ratio of...

Embodiment 3

[0044] (1) Preparation of binder for silicon carbon negative electrode and electrode material for lithium ion battery:

[0045]Under nitrogen protection, 2.16g (10mmol) 3,3'-dihydroxybenzidine (p-HAB), 2.00g (10mmol) 4,4'-diaminodiphenyl ether (ODA) were added to 50mL N-methyl Stir and dissolve pyrrolidone (NMP) completely, then add 6.44g (20mmol) 3,3',4,4'-benzophenonetetracarboxylic dianhydride (BTDA), and stir for 12 hours to obtain a polyamic acid solution;

[0046] Add 0.24g (10mmol) lithium hydroxide (LiOH) into 5mL deionized water to dissolve completely, then add it to the above polyamic acid solution, stir and react for 6 hours to form polyamic acid salt, which is the bonding agent for the silicon carbon negative electrode. agent.

[0047] Stir and mix 5g of the above-mentioned silicon-carbon negative electrode binder (adding NMP to adjust the solid content to 10wt%) and 4g of silicon-carbon electrode active material (graphite and nano-silicon powder with a mass ratio...

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Abstract

The invention discloses an adhesive for a silicon-carbon negative electrode and an electrode material for a lithium ion battery. The adhesive is obtained by reacting polyamide acid with lithium salt; wherein the polyamide acid is obtained by carrying out polycondensation on a dianhydride monomer and a diamine monomer, and the diamine monomer comprises diamine containing phenolic hydroxyl groups. The binder can effectively inhibit slippage between the binder and the silicon-carbon active material, improve the ionic conductivity of the silicon-carbon active material, and effectively improve the initial coulombic efficiency and cycling stability of the lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to an adhesive for a silicon-carbon negative electrode and an electrode material for a lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in portable consumer electronics such as mobile phones, notebook computers, and digital cameras due to their high energy density, environmental friendliness, and no memory effect. In recent years, the rapid development of thinner, lighter, smarter and more functional consumer electronics has put forward higher requirements for the energy density of lithium-ion batteries. The use of high-capacity active materials can significantly increase the capacity of the battery, and is also one of the effective ways to increase the energy density of the battery. [0003] The theoretical capacity of the traditional graphite negative electrode is only 372mAh / g, while the theoretical capacity of the silicon materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/36H01M4/38H01M10/0525
CPCH01M4/622H01M4/623H01M4/362H01M4/386H01M10/0525Y02E60/10
Inventor 徐哲解惠东邵成蒙
Owner 浙江中科玖源新材料有限公司
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