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Secondary battery anode piece and preparation method thereof

A secondary battery and positive electrode technology, which is applied in the field of secondary battery positive electrodes and its preparation, can solve the problems of low high-current discharge capacity of secondary batteries, improve service life and high-current discharge capacity, improve utilization rate, Reduce the effect of oxygen evolution reaction

Inactive Publication Date: 2011-08-10
SHENZHEN HIGHPOWER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional secondary batteries have low high-current discharge capacity

Method used

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  • Secondary battery anode piece and preparation method thereof
  • Secondary battery anode piece and preparation method thereof
  • Secondary battery anode piece and preparation method thereof

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Experimental program
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Effect test

preparation example Construction

[0026] Such as figure 1 The preparation method of the above-mentioned secondary battery positive plate shown includes the following steps:

[0027] S10. Mix 100 parts of spherical nickel, 0.5-5 parts of binder and 0.1-10 parts of additives according to the mass ratio to obtain positive electrode slurry.

[0028] The positive electrode slurry may also include 0.1-10 parts of CoO.

[0029] The adhesive can be CMC, PTFE or HPMC.

[0030] S20, uniformly disperse the positive electrode slurry on the substrate, and obtain the positive electrode sheet of the secondary battery after drying, rolling, cutting and welding.

[0031] The base material can be bubble nickel, copper mesh or steel mesh.

[0032] A secondary battery using the above-mentioned positive electrode sheet is provided below to illustrate the contribution of the above-mentioned positive electrode sheet to the high-current discharge capacity of the secondary battery.

Embodiment

[0034] Make the positive plate

[0035] Mix 100 parts of spherical nickel, 4 parts of CoO, 2 parts of CMC and 2 parts of additives according to the mass ratio, add an appropriate amount of water, mix and stir to obtain the positive electrode slurry, and evenly coat the positive electrode slurry on the substrate made of foamed nickel , and then go through drying, rolling, cutting, welding and other processes to make the positive electrode sheet.

[0036] For spherical nickel, choose Ni(OH) with a particle size of about 500nm 2 , the additives are LiOH and Li with a mass ratio of 1:1 2 CO 3 .

[0037] Making Negative Plates

[0038] According to the mass ratio, 100 parts AB 5 Mix hydrogen storage alloy powder, 0.5 parts of acetylene black and 0.5 parts of nickel powder, add an appropriate amount of adhesive SBR (styrene-butadiene rubber) and water, mix and stir to obtain negative electrode slurry, and evenly coat the negative electrode slurry on the nickel-plated surface. ...

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Abstract

The invention discloses a secondary battery anode piece, comprising a substrate layer and an active layer covering the substrate layer, wherein the active layer contains the following components in parts by weight: 100 parts of spherical nickel, 0.5 to 5 parts of bonding agent and 0.1 to 10 parts of additive which is at least one of LiOH, Li2CO3 and Na3PO4. As the anode piece is added with at least one additive of LiOH, Li2CO3 and Na3PO4, the advantages of raising the utilization rate of active substances, increasing the overpotential of an oxygen evolution reaction, reducing the occurrence of the oxygen evolution reaction and improving charging efficiency are achieved, and thus, the service life of the secondary battery of the anode piece is obviously prolonged and the high-current discharging capacity of the same is obviously improved. The invention further provides a preparation method of the secondary battery anode piece.

Description

【Technical field】 [0001] The invention relates to the field of energy storage devices, in particular to a secondary battery positive plate and a preparation method thereof. 【Background technique】 [0002] Secondary batteries, also known as rechargeable batteries, use the reversibility of chemical reactions, that is, after a chemical reaction is converted into electrical energy, the chemical system can be repaired with electrical energy, and then the chemical reaction is converted into electrical energy for recycling. [0003] Traditional secondary batteries have low high-current discharge capacity. 【Content of invention】 [0004] Based on this, it is necessary to provide a secondary battery positive plate capable of improving the high-current discharge capacity of the secondary battery and a preparation method thereof. [0005] A positive electrode sheet for a secondary battery, comprising a base layer and an active layer coated on the base layer; the active layer include...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/74H01M4/04
CPCY02E60/12Y02E60/10
Inventor 周志雄孔令坤李文良
Owner SHENZHEN HIGHPOWER TECH CO LTD
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