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A kind of positive electrode slurry for nickel-metal hydride power battery

A power battery and positive electrode slurry technology, which is applied to nickel storage batteries, battery electrodes, batteries, etc., can solve the problems of affecting the weight distribution of the positive electrode, pump blockage, and poor weight consistency of the positive electrode, so as to achieve smooth and stable sizing process of the positive electrode. Good filling uniformity and the effect of improving the overall performance

Active Publication Date: 2022-04-08
先进储能材料国家工程研究中心有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, spraying technology is generally used in the production of positive electrodes. The characteristics of the slurry directly affect the stability of the positive electrode filling and coating, thereby affecting the weight distribution of the positive electrode, and ultimately affecting the consistency of the battery.
At present, the existing conventional nickel-metal hydride power battery cathode slurry usually uses PTFE and other adhesives. The slurry obtained by kneading is prone to fibrosis such as PTFE when it is sprayed with a screw pump, which leads to blockage of the pump and finally fills the positive electrode sheet. The weight distribution is poor, and the weight consistency of the positive plate is poor, which cannot meet the requirements of automotive power batteries

Method used

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  • A kind of positive electrode slurry for nickel-metal hydride power battery
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  • A kind of positive electrode slurry for nickel-metal hydride power battery

Examples

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Effect test

Embodiment 1

[0018] A method for preparing a positive electrode slurry for a nickel-metal hydride power battery. First, weigh each material according to the mass ratio of the positive electrode active material, additives, first binder, and second binder, 100:3:0.1:0.8, and the positive electrode active material For cobalt-coated and zinc-coated nickel balls, the additive is cobalt powder, the first binder is CMC, the second binder is 30% to 38% AFLAS latex, and the amount of deionized water is calculated based on the solid content of the slurry at 75%. And ready for use, the first binder is prepared into a 3% CMC solution with deionized water for use, then the positive electrode active material and additives are placed in the mixing ax and mixed for 30min, and the remaining deionized water for use is mixed Part of it is added to the refining and mixing shaft twice for stirring - scraping, the total stirring time is controlled at 30 minutes, and the slurry is scraped once in the middle, then...

Embodiment 2

[0022] A method for preparing a positive electrode slurry for a nickel-metal hydride power battery, the steps of which are basically the same as the steps of the method for preparing a positive electrode slurry for a nickel-hydrogen power battery in Example 1, except that the positive electrode active material, additives, and The mass ratio of the first binder and the second binder is 110:5:0.3:1.2, the amount of deionized water is calculated according to the solid content of the slurry at 80%, the additive is yttrium oxide, the first binder is HPMC, and the The first binder is prepared into a 1% HPMC solution with deionized water to be used; the positive electrode active material and additives are placed in the mixing shaft and mixed for 40 minutes, and the remaining part of the deionized water to be used is added to the mixing shaft at one time. Stirring—scraping, the total stirring time is controlled to 45 minutes, and the middle is scraped twice. The stirring time after add...

Embodiment 3

[0026] A method for preparing a positive electrode slurry for a nickel-metal hydride power battery, the steps of which are basically the same as those of the method for preparing a positive electrode slurry for a nickel-hydrogen power battery in Example 1, except that:

[0027] 1. In step (1), the mass ratio of positive electrode active material, additive, first binder, and second binder is 105:4:0.25:0.08:1.0, and the deionized water is calculated based on the solid content of the slurry of 71%. The dosage, the additive is zinc oxide, and the binder is prepared into a 2% CMC solution with deionized water for use; the positive electrode active material and the additive are mixed in a mixing ax for 45 minutes, and the remaining part of the deionized water for use is once Add to the mixing ax for stirring-scraping, the total stirring time is controlled to 40min, the middle scraping is 2 times, the stirring time after adding the first binder is controlled to 4min, and the second b...

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Abstract

The invention provides a positive electrode slurry for a nickel-metal hydride power battery, including a positive electrode active material, an additive, a first binder and a second binder, and the positive electrode active material, the additive, the first binder, the second binder The mass ratio of the binder is 100-110: 3-5: 0.1-0.3: 0.8-1.2; the positive active material is cobalt-coated zinc spherical nickel, and the additives are cobalt powder, zinc oxide, yttrium oxide, ytterbium oxide One or more of them; the first binder is CMC or HPMC; the second binder is 30%-38% AFLAS latex, and the solid content of the slurry is 70%-80%. The invention also provides a method for preparing the positive electrode slurry of the nickel-metal hydride power battery. The anode slurry for a nickel-hydrogen power battery of the present invention has good stability and no material fibrosis, is more suitable for a screw pump coating system, and has a simple and feasible preparation method.

Description

technical field [0001] The invention relates to a positive electrode slurry of a nickel-hydrogen power battery. Background technique [0002] There are more and more application fields of nickel-metal hydride power batteries, and the consistency of positive and negative electrodes is the key to the consistency of performance of nickel-metal hydride power batteries, especially the positive electrode. At present, spraying technology is generally used for the production of positive electrodes. The characteristics of the slurry directly affect the stability of the positive electrode filling and coating, thereby affecting the weight distribution of the positive electrode, and ultimately affecting the consistency of the battery. At present, the existing conventional nickel-metal hydride power battery cathode slurry usually uses PTFE and other adhesives. The slurry obtained by kneading is prone to fibrosis such as PTFE when it is sprayed with a screw pump, which leads to blockage o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/42H01M4/62H01M10/30
CPCH01M4/38H01M4/42H01M4/623H01M4/626H01M4/628H01M10/30H01M2220/20H01M2004/028Y02E60/10
Inventor 钟发平宋婷柳立新匡德志周旺发万正坤黄明孙丽红裴建栋
Owner 先进储能材料国家工程研究中心有限责任公司
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