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Preparation method of negative electrode plate of nickel-metal hydride battery

A technology of negative pole piece and nickel-metal hydride battery, which is applied in the direction of alkaline battery electrode, etc., can solve the problems of waste of negative electrode active material, serious self-discharge, battery explosion, etc., and achieves extended cycle life and storage life, high current charge and discharge. Effect enhancement, self-discharge and hydrogen evolution suppression effect

Active Publication Date: 2014-06-25
广州云通锂电池股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Second, the negative electrode sheet of the nickel-hydrogen battery produced by the prior art has a large specific capacity and greatly exceeds the specific capacity of the positive electrode sheet. Therefore, in the case of matching external dimensions, the negative active material is seriously wasted, which invisibly improves and wastes the battery capacity. manufacturing cost
[0005] Third, since most of the negative electrode active materials are pure metal-hydrogen alloys, their self-discharge is serious, which seriously affects the capacity and cycle life of Ni-MH batteries.
[0006] Fourth, due to the serious self-discharge or hydrogen precipitation of the negative electrode, the battery bulges, which affects the discharge capacity and service life of the Ni-MH battery, but also poses a great safety hazard, such as causing battery explosion, fire, etc.

Method used

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  • Preparation method of negative electrode plate of nickel-metal hydride battery
  • Preparation method of negative electrode plate of nickel-metal hydride battery
  • Preparation method of negative electrode plate of nickel-metal hydride battery

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A method for manufacturing the negative pole piece of a nickel-hydrogen battery, the steps are:

[0031] In the first step, the negative electrode active material coating is a mixture of nano-metal hydrogen alloy (particle size of about 5-100nm), carbon nanotubes, and nanographite (particle size of about 5-35nm) with a mass ratio of 3:1:1. Active material mixture and PTFE emulsion (with a concentration of about 60wt%) accounting for 1.5% by weight of nano-metal hydrogen alloy, carbon nanotube, and nano-graphite mixture, and distilled water accounting for 15% by weight of nano-metal hydrogen alloy, carbon nanotube, and nano-graphite mixture Made into slurry;

[0032] In the second step, the slurry produced in the first step is coated on the negative electrode current collector (2) through a sizing process, and then dried (temperature controlled at 65~85°C) and pressed by a roller to make the active material slurry The polar active material coating (1) is formed on the curren...

Embodiment 2

[0036] A method for manufacturing the negative pole piece of a nickel-hydrogen battery, the steps are:

[0037] In the first step, the negative electrode active material coating is a mixture of nano-metal hydrogen alloy (particle size about 5-100nm), carbon nanotubes, and nano-graphite (particle size about 5-35nm) with a mass ratio of 3:0.6:0.6. The active material mixture and PTFE which accounts for 1.8% of the mass ratio of nano metal hydrogen alloy, carbon nanotube, and nano graphite mixture, and distilled water which accounts for 20% of the mass ratio of nano metal hydrogen alloy, carbon nanotube, and nano graphite mixture to form a slurry;

[0038] In the second step, the slurry produced in the first step is coated on the negative electrode current collector (2) through a sizing process, and then dried (temperature control 65~85℃) and pressed by a roller to make the active material slurry Form a very active material coating (1) on the current collector, after cutting and other...

Embodiment 3

[0042] A method for manufacturing the negative pole piece of a nickel-hydrogen battery, the steps are:

[0043] In the first step, the negative electrode active material coating is a mixture of nano-metal hydrogen alloy (particle size about 5-100nm), carbon nanotubes, and nanographite (particle size about 5-35nm) with a mass ratio of 3:0.75:0.75. The active material mixture, PTFE with a mass ratio of 2% of the nano-metal hydrogen alloy, carbon nanotube, and nano-graphite mixture, and distilled water with a mass ratio of 25% of the nano-metal hydrogen alloy, carbon nanotube, and nano-graphite mixture are made into a slurry;

[0044] In the second step, the slurry produced in the first step is coated on the negative electrode current collector (2) through a sizing process, and then dried (temperature control 65~85℃) and pressed by a roller to make the active material slurry Form a very active material coating (1) on the current collector, after cutting and other processes, and then u...

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Abstract

The invention discloses a preparation method of negative electrode plate of a nickel-metal hydride battery. The preparation method comprises: (1) mixing nano metal hydride alloy, carbon nanotubes and nanographite with a particle size of 5 to 100 nm, and an active substance mixture with a particle size of 5 to 35nm according to a mass ratio of 3:1:1 to 3:0.5:0.5 to obtain a mixture, and preparing a slurry from the mixture, polytetrafluoroethylene (emulsion), and distilled water, wherein polytetrafluoroethylene (emulsion) and distilled water respectively account for 1.5% to 3% and 15% to 30% the mass of the mixture of nano metal hydride alloy, carbon nanotubes and nanographite; and (2) coating the slurry prepared in step (1) on a negative current collector, oven-drying, pressing by a roll crusher, so that the active substance slurry forms an electrode active substance coating on the current collector, cutting, and ultrasonic or laser welding 1 to 5 negative electrode lugs at the reserved blank positions of the current collector. The battery provided by the invention has the advantages of high cycling capacity, long service life and storage life, good large-current discharge effect, and high safety performance.

Description

Technical field [0001] The invention relates to the technical field of chemical power sources, in particular to a method for manufacturing a nickel-hydrogen battery negative pole piece. The negative pole piece of a nickel-hydrogen battery manufactured by this technology can be used to manufacture various types of nickel-hydrogen batteries, and is particularly suitable for manufacturing various types of nickel-hydrogen power batteries. Background technique [0002] At present, the negative pole piece used in the nickel-hydrogen battery manufactured by the existing battery industry is mainly composed of three parts: the negative electrode active material coating, the nickel-plated stainless steel mesh negative current collector, and the nickel belt negative electrode tab. The nickel-hydrogen battery manufactured by the negative pole piece of this structure has significant shortcomings: [0003] First, due to the use of ordinary metal-hydrogen alloys, the manufactured electrode pole ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/26
CPCY02E60/124Y02E60/10
Inventor 詹炳然罗社科詹金俊唐帮助王建红
Owner 广州云通锂电池股份有限公司
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