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Lithium ion battery composite anode pole piece, preparation method and lithium ion battery

A technology for lithium-ion batteries and negative pole pieces, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of processing performance deviation, general cycle life, high discharge voltage, etc., and achieve increased compaction density, excellent processing performance, The effect of increasing the magnification

Active Publication Date: 2014-04-02
LUOYANG YUEXING NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the anode materials used in the market are graphite materials, which have the advantages of excellent processing performance, high capacity, and low discharge voltage, but their general cycle life, poor rate performance, and poor safety performance limit their use. Materials are developing in a more excellent direction
Lithium titanate negative electrode material has the advantages of high safety performance, long cycle life (cycle life can reach 20,000 times), excellent low temperature performance, etc., but its low specific capacity, high discharge voltage, and deviation in processing performance limit its material widely used

Method used

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  • Lithium ion battery composite anode pole piece, preparation method and lithium ion battery
  • Lithium ion battery composite anode pole piece, preparation method and lithium ion battery
  • Lithium ion battery composite anode pole piece, preparation method and lithium ion battery

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Experimental program
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Embodiment 1

[0027] The lithium-ion battery composite negative electrode sheet of this embodiment includes a negative electrode current collector, and the two sides of the negative electrode current collector are respectively coated with a first coating layer and a second coating layer, and the coating of the first coating layer The slurry is graphite slurry, and the coating slurry of the second coating layer is lithium titanate slurry. The negative current collector is copper foil. The graphite slurry is prepared by adding graphite, binder, and conductive agent into deionized water in a mass ratio of 96:3:1 and mixing uniformly. The lithium titanate slurry is prepared by adding lithium titanate, a binder, and a conductive agent into deionized water at a mass ratio of 92:5:3 and mixing them uniformly. The LA132 water-based binder. The conductive agent is carbon black.

[0028] The preparation method of the lithium-ion battery composite negative pole piece of the present embodiment compr...

Embodiment 2

[0035] The lithium-ion battery composite negative electrode sheet of this embodiment includes a negative electrode current collector, and the two sides of the negative electrode current collector are respectively coated with a first coating layer and a second coating layer, and the coating of the first coating layer The slurry is graphite slurry, and the coating slurry of the second coating layer is lithium titanate slurry. The negative current collector is copper foil. The graphite slurry is prepared by adding graphite, binder, and conductive agent into deionized water at a mass ratio of 92:5:2 and mixing them uniformly. The lithium titanate slurry is prepared by adding lithium titanate, a binder, and a conductive agent into deionized water at a mass ratio of 90:7:2 and mixing them uniformly. The binder is a CMC / SBR water-based binder. The conductive agent is SP.

[0036] The preparation method of the lithium-ion battery composite negative pole piece of the present embodim...

Embodiment 3

[0043] The lithium-ion battery composite negative electrode sheet of this embodiment includes a negative electrode current collector, and the two sides of the negative electrode current collector are respectively coated with a first coating layer and a second coating layer, and the coating of the first coating layer The slurry is graphite slurry, and the coating slurry of the second coating layer is lithium titanate slurry. The negative current collector is copper foil. The graphite slurry is prepared by adding graphite, binder, and conductive agent into deionized water at a mass ratio of 94:1:3 and mixing uniformly. The lithium titanate slurry is prepared by adding lithium titanate, a binder, and a conductive agent into deionized water at a mass ratio of 94:4:2.5 and mixing them uniformly. The adhesive is LA132 water-based adhesive. The conductive agent is carbon black.

[0044] The preparation method of the lithium-ion battery composite negative pole piece of the present ...

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Abstract

The invention discloses a lithium ion battery composite anode pole piece which comprises an anode current collector; two sides of the anode current collector are coated with a first coating layer and a second coating layer respectively; the coating slurry of the first coating layer is graphite slurry, and the coating slurry of the second coating layer is lithium titanate slurry. According to the invention, two sides of the anode current collector are respectively coated with a first coating layer comprising graphite, a binder, and a conductive agent, and a second coating layer comprising lithium titanate, a binder, and a conductive agent; with the characteristics of high gram capacity, excellent processing property, and low voltage platform of the graphite anode material, the energy density of the battery is increased; with the characteristics of good rate capability, excellent cycle performance, and good low temperature performance of the lithium titanate anode material, the application scope of the battery is enlarged, and the electrochemical performance of the battery is improved. The invention also discloses a preparation method of the composite anode pole piece, and a lithium ion battery comprising the composite anode pole piece.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and specifically relates to a lithium ion battery composite negative pole piece, and also relates to a preparation method of the composite negative pole piece and a lithium ion battery using the composite negative pole piece. Background technique [0002] Lithium-ion batteries are a new type of energy storage power source developed in recent years, and are widely used in communications, electric vehicles, energy storage and other fields due to their characteristics of portability, high energy density, long cycle life, and environmental friendliness. At the same time, with the increasing energy density requirements of lithium-ion batteries for portable electronic products, lithium-ion batteries with high energy density, long cycle life, high rate performance, high safety performance and excellent low-temperature performance have attracted people's attention. [0003] Whether it is a ...

Claims

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Application Information

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IPC IPC(8): H01M4/133H01M4/131H01M4/1391H01M4/1393H01M10/0525
CPCY02E60/122H01M4/131H01M4/133H01M4/1391H01M4/1393H01M10/0525Y02E60/10
Inventor 徐军红陈和平
Owner LUOYANG YUEXING NEW ENERGY TECH
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