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Anode plate of lithium ion battery and its preparation method

A lithium-ion battery and anode technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve the problems of poor alloy-diaphragm interface, uneven stress distribution, uneven coating of anode active materials, etc. Achieving good buffering effect and ensuring stability

Inactive Publication Date: 2012-06-27
NINGDE AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method will not only lead to uneven coating of the anode active material on the anode current collector, but also reduce the strength of the anode current collector.
Uneven distribution of alloy active substances can easily lead to uneven stress distribution when the alloy deintercalates lithium, resulting in deterioration of the alloy-diaphragm interface and affecting the electrochemical performance of lithium-ion batteries

Method used

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  • Anode plate of lithium ion battery and its preparation method
  • Anode plate of lithium ion battery and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Preparation of the cathode: using lithium cobalt oxide (LiCoO 2 ) as the cathode active material, prepare the slurry containing lithium cobaltate cathode active material: by weight percentage, the solid content of slurry comprises 90% lithium cobaltate as the cathode active material, 5% polyvinylidene fluoride (PVDF) As an adhesive, 5% conductive carbon black (SP) is used as an electronic conductivity aid, and N-methylpyrrolidone (NMP) is used as a solvent, wherein the weight of the solvent accounts for 55% of the total slurry weight; high-speed stirring is uniformly dispersed After that, it is evenly coated on both sides of the aluminum foil, blown and dried, and then cold-pressed with a roller press, and the cathode electrode sheet is obtained after cutting and other processes.

[0027]Anode current collector treatment: copper foil is used as the anode current collector. In weight percentage, the treatment layer contains 45% conductive carbon black (SP), 30% alkali me...

Embodiment 2

[0031] In terms of dry weight percentage, the treatment layer slurry contains 45% conductive carbon black (40% SP+5% VGCF), 25% lithium polyacrylate (Li-PAA) and 30% styrene-butadiene latex (SBR), The solvent is deionized water, which accounts for 80% of the total weight of the slurry, and the others are the same as in Example 1.

Embodiment 3

[0033] In terms of dry weight percentage, the treatment layer slurry contains 40% conductive carbon black (30% SP+10% VGCF), 30% lithium polyacrylate (Li-PAA) and 30% styrene-butadiene latex (SBR), The solvent is deionized water, which accounts for 80% of the total weight of the slurry, and the others are the same as in Example 1.

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Abstract

The invention discloses an anode plate of a lithium ion battery, which comprises an anode current collector and an anode active substance layer, a processing layer is distributed between the anode current collector and the anode active substance layer, the processing layer contains 30-50% of conductive carbon black, 25-50% of alkali metal polyacrylates and 20-40% of aqueous latex by weight percentage. In the anode plate of the lithium ion battery, the conductive carbon black in the processing layer is capable of enhancing the conductivity between the anode current collector and the anode active substance layer; due to the existence of a carboxyl functional group, the alkali metal polyacrylates possess good bonding performance, and are capable of obviously enhancing the bonding among the anode current collector, the processing layer and the anode active substance layer; the aqueous latex possesses auxiliary bonding effect, and possesses high elasticity to provide the good flexibility to the processing layer, thereby the buffer effect can be acted at the processing layer interface when the alloy anode is expanded, and the alloy expansion stress release is performed. The invention also discloses a preparation method of the anode plate of the lithium ion battery.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and more specifically, the invention relates to a lithium ion battery anode pole piece and a preparation method thereof. Background technique [0002] Since Japan's Sony (Sony) took the lead in commercializing lithium-ion batteries in 1991, lithium-ion batteries have been widely used in various fields because of their advantages such as high energy density, high voltage, low self-discharge rate and light weight. [0003] With the continuous expansion of the application range of lithium-ion batteries, people's requirements for their performance are also increasing. For example, consumer electronics batteries and power batteries such as PHEV, HEV, and EV have higher and higher energy density requirements. Traditional anode materials can no longer meet the requirements of energy density. Now the commercialized graphite capacity (>360mAh / g) is very close to the theoretical capacity of graphite...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/62H01M4/139
CPCY02E60/122Y02E60/10
Inventor 许国成袁庆丰赵丰刚
Owner NINGDE AMPEREX TECH
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