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Graphene negative pole piece and preparation method thereof

A negative electrode sheet and graphite negative electrode technology, which is applied in the direction of electrode manufacturing, battery electrodes, electrode collector coating, etc., can solve the problems of poor conductivity and large consumption of conductive agent binders, etc., to improve energy density Effects on cycling stability, reducing battery internal resistance, and reducing usage

Inactive Publication Date: 2018-06-01
BEIJING DINGNENG KAIYUAN BATTERY TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems of poor conductivity between electrode active materials and substrates and large consumption of conductive agent binders in the prior art, the object of the present invention is to provide a preparation method for graphene negative pole pieces

Method used

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Effect test

Embodiment 1

[0034] This embodiment provides a method for preparing a negative electrode sheet, comprising the following steps:

[0035] 1) Add 0.04g of graphene and 0.05g of sodium dodecylbenzenesulfonate per liter of deionized water, place it at a temperature of 45°C, and oscillate ultrasonically for 60min with a power of 600w to prepare a graphene suspension ;

[0036] 2) In the electrolytic cell, the graphene suspension prepared in step 1) is the electrolyte, the graphite paper is the anode, and the copper foil is the counter electrode, applying a constant voltage electric field, controlling the electric field intensity to be 8V / m, and after depositing for 60min, The graphite paper on which the graphene was deposited was taken out, placed in a blast drying oven, and dried at a constant temperature at 60° C. for 3 hours; and then coated with a graphite negative electrode material to obtain a negative electrode sheet.

Embodiment 2

[0038] This embodiment provides a method for preparing a negative electrode sheet, comprising the following steps:

[0039] 1) Add 0.08g of graphene and 0.05g of sodium dodecylbenzenesulfonate per liter of deionized water, place it at a temperature of 50°C, and oscillate ultrasonically for 80min with a power of 600w to prepare a graphene suspension ;

[0040] 2) In the electrolytic cell, the graphene suspension prepared in step 1) is the electrolyte, the graphite paper is the anode, and the copper foil is the counter electrode, applying a constant voltage electric field, controlling the electric field intensity to be 8V / m, and after depositing for 60min, The graphite paper on which the graphene was deposited was taken out, placed in a blast drying oven, and dried at a constant temperature at 60° C. for 3 hours; and then coated with a graphite negative electrode material to obtain a negative electrode sheet.

Embodiment 3

[0042] This embodiment provides a method for preparing a negative electrode sheet. The difference from Embodiment 1 is that the electric field intensity is controlled to be 10 V / cm.

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Abstract

The invention relates to a graphene negative pole piece and a preparation method thereof. The preparation method specifically comprises the steps of using graphene suspension liquid as an electrolyte,uniformly depositing graphene on a surface of a working electrode made of graphite through an electrophoretic deposition method, drying and then preparing a conductive layer, and coating the conductive layer with a graphite negative pole material so as to obtain the negative pole piece. Through adoption of the preparation method provided by the invention, less conductive additive and adhesive areused, the energy density and circulation stability of a battery are improved, and battery internal resistance is reduced.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a graphene negative electrode sheet and a preparation method thereof. Background technique [0002] In recent years, in response to the country's call for green environmental protection and the development of green new energy, the lithium battery industry has developed rapidly. The energy density and capacity of lithium-ion batteries have continued to increase. Its superior performance has attracted attention from many fields. In civilian and military fields, such as digital Equipment, new energy vehicles, defense industry and other fields have broad application prospects. [0003] However, there are still many problems to be solved in the manufacturing process of lithium-ion batteries. For example, in the production process of battery negative electrode sheet, water or organic solvent is generally used to make slurry, and then coated on copper foil. Adhesives such as PVDF are mixed in...

Claims

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Application Information

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IPC IPC(8): H01M4/1393H01M4/133H01M4/04H01M4/66H01M10/0525
CPCH01M4/0404H01M4/133H01M4/1393H01M4/663H01M4/667H01M10/0525Y02E60/10
Inventor 杨慧敏赵张宝郑淑芬贾跃祥何培爽
Owner BEIJING DINGNENG KAIYUAN BATTERY TECH
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