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Method for preparing low temperature lithium ion battery negative electrode sheet

A lithium-ion battery and negative electrode technology, which is applied in battery electrodes, electrode manufacturing, secondary batteries, etc., can solve the problems of poor low-temperature performance of lithium iron phosphate, achieve excellent low-temperature dynamic performance, reduce contact resistance, and increase volume energy Effect of Density and Gravimetric Energy Density

Active Publication Date: 2020-02-28
SHAANXI J&R FIRE FIGHTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lithium iron phosphate used for the positive electrode itself has poor low-temperature performance

Method used

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  • Method for preparing low temperature lithium ion battery negative electrode sheet
  • Method for preparing low temperature lithium ion battery negative electrode sheet

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation method of described a kind of low-temperature energy type lithium-ion power battery negative plate comprises the following steps:

[0030] The first step: material preparation and mixing: the amorphous carbon-coated graphite, negative electrode conductive agent and negative electrode binder are prepared in a weight ratio of 96:2:2, and the negative electrode conductive agent is made of conductive carbon black and carbon fiber in weight ratio 1:1 composition; the negative electrode binder is composed of CMC and SBR in a weight ratio of 1:1.

[0031] First, add amorphous carbon-coated graphite and negative electrode conductive agent into the stirrer, mix and disperse, add negative electrode binder, mix at high speed until the viscosity is 5000mpa.s, and stir at low speed to obtain negative electrode slurry.

[0032] The second step: Coating and rolling: Coat the negative electrode slurry on the carbon-coated copper foil, the thickness of the copper foil in...

Embodiment 2

[0035] The preparation method of described a kind of low-temperature energy type lithium-ion power battery negative plate comprises the following steps:

[0036] Add amorphous carbon-coated graphite and negative electrode conductive agent into the stirrer, mix and disperse, add negative electrode binder, mix at high speed until the viscosity is 8000mpa.s, and stir at low speed to obtain negative electrode slurry.

[0037] Wherein, the negative electrode binder is composed of CMC and SBR in a weight ratio of 1:1. Negative electrode conductive agent is made up of conductive carbon black and carbon fiber by weight ratio 1:1.5, and the weight ratio of amorphous carbon coated graphite, negative electrode conductive agent and negative electrode binder is 96.5:1.5:2;

[0038] The negative electrode slurry was coated on carbon-coated copper foil, the thickness of the copper foil was 6 μm, and the thickness of the carbon-coated layer was 0.5 μm. Rolling once after drying, the compacte...

Embodiment 3

[0040] The preparation method of described a kind of low-temperature energy type lithium-ion power battery negative plate comprises the following steps:

[0041] Add amorphous carbon-coated graphite and negative electrode conductive agent into the stirrer, mix and disperse, add an appropriate amount of SBR solution containing PVA, mix at high speed until the viscosity is 9000mpa.s, and stir at low speed to obtain negative electrode slurry.

[0042] Wherein, the negative electrode binder is composed of CMC and SBR in a weight ratio of 1:1. Negative electrode conductive agent is made up of conductive carbon black and carbon fiber by weight ratio 1:1.2, and the weight ratio of amorphous carbon-coated graphite, negative electrode conductive agent and negative electrode binder is 96.5:1.5:2;

[0043] The negative electrode slurry was coated on carbon-coated copper foil, the thickness of the copper foil was 6 μm, and the thickness of the carbon-coated layer was 0.8 μm. Rolling once...

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Abstract

The invention provides a method for preparing a low temperature energy type lithium ion power battery negative electrode sheet. Graphite coated with amorphous carbon is adopted and mixed with a negative electrode conductive agent / binder. The water system slurry mixing process is adopted and the negative electrode sheet adopts secondary roller pressing. After primary roller pressing, a layer of CMCgrafted acrylic coating is continuously coated on the surface of the electrode sheet, surface treatment is performed with low-temperature plasma and secondary roller pressing is performed. The surface of the electrode sheet is continuously coated with a layer of CMC graft acrylic coating and surface treatment is performed with the low-temperature plasma, the roughness of the electrode piece surface is microscopically increased, the surface activity is provided, the liquid retention performance of the negative electrode sheet at low temperature is increased and contact resistance between the electrode sheet and the surface of the diaphragm is reduced.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to the technical field of lithium-ion batteries, in particular to a method for preparing a low-temperature high-energy-density power cell. Background technique [0002] The development of power batteries in our country is basically synchronized with that of complete vehicles. At present, we are at a stage where we have basically mastered the key technologies of vehicle power batteries. Judging from the development trend and the situation around the world, lithium-ion batteries have become the main direction of power batteries. [0003] At present, most of the battery cells mass-produced in the market can only be charged above 0°C, and charging below 0°C requires a heating system to be heated before charging, which greatly wastes the energy density of the battery pack. Electric vehicle manufacturers have higher and higher requirements for low-temperature charging performance, req...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/1393H01M4/04H01M10/0525
CPCH01M4/366H01M4/583H01M4/62H01M4/625H01M4/628H01M4/1393H01M4/0404H01M4/043H01M10/0525Y02E60/10
Inventor 耿铁成胡琪卉张琦朱其峰文亚洲
Owner SHAANXI J&R FIRE FIGHTING CO LTD
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