Preparation method of flexible lithium ion battery negative electrode material

A lithium-ion battery and negative electrode material technology, applied in electrode manufacturing, battery electrodes, electrode rolling/calendering, etc., can solve problems such as unsatisfactory bending stability, electrochemical performance degradation, active material shedding, etc., and achieve good rate Effects of performance and cycle performance, reduction of interface resistance, and enhancement of bond strength

Active Publication Date: 2019-07-19
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in these methods, due to the physical combination of active materials and binders, conductive agents, and current collectors, the strength is low, and the bending stability cannot be satisfied. The active materials will still fall off during charging and discharging, resulting in a decrease in electrochemical performance. Flexible battery that needs to be bent for a long time during use

Method used

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  • Preparation method of flexible lithium ion battery negative electrode material
  • Preparation method of flexible lithium ion battery negative electrode material
  • Preparation method of flexible lithium ion battery negative electrode material

Examples

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Comparison scheme
Effect test

Embodiment 1

[0041] A preparation method of a lithium ion battery flexible negative electrode material, comprising the following steps:

[0042] (1) Add 0.5g of graphite flakes to 50mL of concentrated sulfuric acid, stir for 1h under ice-water bath conditions, then add 5g of potassium permanganate, continue stirring for 1h under ice-water bath conditions, and then under medium temperature 40°C and high temperature 90°C Stir respectively for 1.5 hours; add 1000mL deionized water several times at 90°C, and add 10mL hydrogen peroxide after the reaction is complete to obtain a clear bright yellow graphene oxide dispersion; wash the graphene oxide dispersion with acid, Freeze-drying to obtain powder;

[0043] (2) Take 0.3 g of graphene oxide synthesized and dried in step (1), dissolve it in 60 ml of 1mol / L hydrochloric acid aqueous solution, ultrasonically disperse for 2 h, add 0.1 g of aniline monomer, stir magnetically for 1 h, then add 0.24 g Ammonium persulfate was reacted at 0°C for 24 hour...

Embodiment 2

[0053] A preparation method of a flexible lithium-ion battery negative electrode material, comprising the following steps:

[0054] (1) Add 0.5g of graphite flakes to 50mL of concentrated sulfuric acid, stir for 1h under ice-water bath conditions, then add 5g of potassium permanganate, continue stirring for 1h under ice-water bath conditions, and then under medium temperature 40°C and high temperature 90°C Stir respectively for 1.5 hours; add 1000mL deionized water several times at 90°C, and add 10mL hydrogen peroxide after the reaction is complete to obtain a clear bright yellow graphene oxide dispersion; wash the graphene oxide dispersion with acid, Freeze-drying to obtain powder;

[0055] (2) Take 0.3 g of graphene oxide synthesized and dried in step (1), dissolve it in 60 ml of N-methylpyrrolidone, disperse it ultrasonically for 2 h, add 0.1 g of aniline monomer, stir magnetically for 1 h, and then add 0.24 g of persulfuric acid Ammonium was reacted at 0°C for 24 hours, t...

Embodiment 3

[0062] A preparation method of a flexible lithium-ion battery negative electrode material, comprising the following steps:

[0063] (1) Add 0.5g of graphite flakes to 50mL of concentrated sulfuric acid, stir for 1h under ice-water bath conditions, then add 5g of potassium permanganate, continue stirring for 1h under ice-water bath conditions, and then under medium temperature 40°C and high temperature 90°C Stir respectively for 1.5 hours; add 1000mL deionized water several times at 90°C, and add 10mL hydrogen peroxide after the reaction is complete to obtain a clear bright yellow graphene oxide dispersion; wash the graphene oxide dispersion with acid, Freeze-drying to obtain powder;

[0064] (2) Take 0.3 g of graphene oxide synthesized and dried in step (1), dissolve it in 60 ml of deionized water, disperse it ultrasonically for 2 hours, and put monomer benzene and catalyst AlCl in a certain proportion under stirring. 3 and oxidant CuCl, slowly raised the temperature to 30°C,...

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Abstract

The invention discloses a preparation method of a flexible lithium ion negative electrode. The method includes the following steps of: taking graphene oxide as an active substance, firstly adding a conductive polymer monomer, performing polymerization to obtain a graphene oxide / conductive polymer composite material, and then sequentially adding an elastomer, a conductive agent and a binder that are capable of bonding with active sites of graphene oxide, performing reduction to obtain an RGO / conductive polymer / conductive agent / binder / elastomer integrated composite material, and finally performing vacuum suction filtration, drying and rolling to obtain an integrated flexible electrode sheet. The flexible electrode sheet prepared by the invention is bonded by chemical bonds and has strong intermolecular force, the active material is not easy to fall off in the process of bending or charging / discharging the electrode sheet, and various parts are in close contact by vacuum suction filtration and rolling to play a cooperation role. The flexible electrode prepared by the invention has good flexibility and electrochemical performance, and still maintains good rate performance and cycle performance after bending tests.

Description

technical field [0001] The invention relates to a method for preparing a negative electrode material of a flexible lithium ion battery, belonging to the technical field of lithium ion batteries. [0002] technical background [0003] With the rapid increase of global energy consumption and environmental pollution, it is urgent to find clean and sustainable energy. As an important energy storage device, lithium-ion batteries have been widely used in daily life due to their environmental protection, low environmental pollution, and excellent electrochemical properties such as long cycle life, high capacity, low self-discharge rate, and no memory effect. Various fields, such as: flexible display screens, implantable medical devices, mobile phones, etc. Among them, the preparation of flexible lithium-ion battery pole pieces with high energy density, high power density, active material is not easy to fall off after bending and folding, and good cycle performance has attracted muc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1393H01M4/04H01M4/587H01M4/62H01M4/66H01M10/0525
CPCH01M4/04H01M4/0435H01M4/0471H01M4/1393H01M4/587H01M4/62H01M4/622H01M4/624H01M4/625H01M4/628H01M4/66H01M10/0525Y02E60/10
Inventor 刘慧勇谷建锋汪思宇何凤清
Owner FUZHOU UNIV
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