Lithium-ion-battery composite material and preparing method of composite electrode of lithium ion battery

A lithium-ion battery, composite electrode technology, applied in battery electrodes, nanotechnology for materials and surface science, negative electrodes, etc., to achieve the effects of improving stability, improving diffusion coefficient, and improving cycle stability

Active Publication Date: 2018-09-21
安普瑞斯(无锡)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional binders can no longer meet the needs

Method used

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  • Lithium-ion-battery composite material and preparing method of composite electrode of lithium ion battery
  • Lithium-ion-battery composite material and preparing method of composite electrode of lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0038] A lithium ion battery composite electrode, the preparation method comprising the following steps:

[0039] 1) Weigh 1g of graphite oxide powder and mix with 80ml of N,N-dimethylformamide, ultrasonically disperse for 1h, transfer to a 100ml reactor, and conduct a hydrothermal reaction at 220°C for 8h. After the mixture is cooled to room temperature, filter it with a microporous membrane to obtain a brown filtrate, remove the DMF solvent by rotary evaporation, then dissolve it in deionized water, dialyze it with a 3000Da molecular weight dialysis bag, and finally freeze-dry the solution in the bag to obtain a solid graphene quantum point;

[0040] 2) Disperse nano-silicon in a mixed solution of 100mL deionized water, 20mL hydrogen peroxide and 20mL ammonia water, heat and react in a water bath at 95°C for 30min, centrifuge and dry to obtain hydrophilic nano-silicon powder;

[0041] 3) Dissolve 0.5g of hydrophilic nano-silicon and 0.5g of dopamine hydrochloride in 100ml o...

Embodiment 2

[0051] 1) Weigh 1.6g of graphite oxide powder and mix with 80ml of N,N-dimethylformamide, ultrasonically disperse for 1h, transfer to a 100ml reactor, and conduct a hydrothermal reaction at 200°C for 8h. After the mixture is cooled to room temperature, filter it with a microporous membrane to obtain a brown filtrate, remove the DMF solvent by rotary evaporation, then dissolve it in deionized water, dialyze it with a 3000Da molecular weight dialysis bag, and finally freeze-dry the solution in the bag to obtain a solid graphene quantum point;

[0052] 2) Disperse nano-silicon in 100mL of deionized water, 40mL of hydrogen peroxide and 20mL of ammonia water, heat and react in a water bath at 95°C for 30min, centrifuge and dry to obtain hydrophilic nano-silicon powder;

[0053] 3) Dissolve 0.5g of hydrophilic nano-silicon and 0.5g of dopamine hydrochloride in 100ml of deionized water in turn, stir vigorously at room temperature for 2 hours, add 20ml of ammonium persulfate dropwise ...

Embodiment 3

[0058] 1) Weigh 1.6g of graphite oxide powder and mix with 80ml of N,N-dimethylformamide, ultrasonically disperse for 1h, transfer to a 100ml reactor, and conduct a hydrothermal reaction at 200°C for 8h. After the mixture is cooled to room temperature, filter it with a microporous membrane to obtain a brown filtrate, remove the DMF solvent by rotary evaporation, then dissolve it in deionized water, dialyze it with a 3000Da molecular weight dialysis bag, and finally freeze-dry the solution in the bag to obtain a solid graphene quantum point;

[0059] 2) Disperse nano-silicon in a mixed solution of 100mL deionized water, 40mL hydrogen peroxide and 20mL ammonia water, heat and react in a water bath at 95°C for 40min, centrifuge, and dry to obtain hydrophilic nano-silicon powder;

[0060] 3) Dissolve 0.5g of hydrophilic nano-silicon and 0.6g of dopamine hydrochloride in 100ml of deionized water in turn, stir vigorously at room temperature for 2 hours, add 20ml of ammonium persulfa...

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Abstract

The invention relates to a lithium-ion-battery composite material and a preparing method of a composite electrode of a lithium ion battery. Nanometer silicon is added into a dopamine hydrochloride solution, and a polydopamine wrapping layer is formed on the surface of silicon; meanwhile, graphene quantum dots are prepared with the one-step solvothermal method, and are doped into sodium alginate binding agent, and a composite electrode material is prepared. In the lithium-ion-battery composite material and the preparing method of the composite electrode of the lithium ion battery, the polydopamine wrapping layer can buffer enormous volume expansion of a silicon ball, and the stability of a silicon-based cathode material is effectively improved. As the graphene quantum dots are doped, a binding agent layer has the higher mechanical performance and the elasticity, the product has the more lasting swelling property in electrolyte accordingly, and can develop the reversible buffering effecton enormous volume changes of silicon after multiple times of cycling, and the structural integrity of an electrode in the charging and discharging process is further guaranteed; meanwhile, the graphene quantum dots have certain conductivity, and therefore the conductivity of the binding agent layer is improved. The electrode shows the good electrochemical performance, and can be widely applied to various high-capacity lithium ion batteries.

Description

technical field [0001] The invention relates to a preparation method of a lithium-ion battery composite material and a composite electrode thereof, belonging to the technical field of lithium-ion batteries Background technique [0002] The development of modern economy is mainly based on fossil energy. However, in the 21st century, the resources on which half the economy depends are rapidly depleting. Due to energy shortages, electrochemical energy storage technologies including batteries, fuel cells, and electrochemical capacitors have emerged one after another. Among these energy conversion devices, lithium-ion batteries, which have the advantages of high energy density, long cycle life, environmental friendliness, and no memory effect, will play a pivotal role. With the improvement of living standards and technological progress, people put forward higher requirements for the performance of lithium-ion batteries. [0003] The anode material of commercial lithium-ion bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/386H01M4/622H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 孔丽娟张德仁张宝凤徐子福
Owner 安普瑞斯(无锡)有限公司
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