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

A technology for negative pole pieces and nickel-metal hydride batteries, which is applied in the manufacture of negative pole pieces for nickel-metal hydride batteries and in the field of nickel-metal hydride power batteries. The effect of extending storage life, suppressing self-discharge and hydrogen evolution, and improving the effect of high-current charge and discharge

Active Publication Date: 2012-11-14
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

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Effect test

Embodiment 1

[0030] A kind of manufacture method of nickel metal hydride battery negative pole sheet, its steps are:

[0031] In the first step, the negative electrode active material coating is mixed nano-metal hydrogen alloy (particle size is about 5-100nm), carbon nanotubes, and nano-graphite (particle size is about 5-35nm) in a mass ratio of 3:1:1. Active material mixture and PTFE emulsion (concentration about 60wt%) accounting for 1.5% of the mass ratio of nano-metal hydride alloy, carbon nanotubes, and nano-graphite mixture, and distilled water accounting for 15% of the mass ratio of nano-metal hydride alloy, carbon nanotubes, 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 the sizing process, then dried (temperature control 65-85°C), and pressed against the roller to make the active material slurry Form the active material coating (1) on the current colle...

Embodiment 2

[0036] A kind of manufacture method of nickel metal hydride battery negative pole sheet, its steps are:

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

[0038]In the second step, the slurry produced in the first step is coated on the negative electrode current collector (2) through the sizing process, then dried (temperature control 65-85°C), and pressed against the roller to make the active material slurry Form a very active material coating (1) on the current collector, go through processes such as slit...

Embodiment 3

[0042] A kind of manufacture method of nickel metal hydride battery negative pole sheet, its steps are:

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

[0044] In the second step, the slurry produced in the first step is coated on the negative electrode current collector (2) through the sizing process, then dried (temperature control 65-85°C), and pressed against the roller to make the active material slurry Form a very active material coating (1) on the current collector, go through processes s...

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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 negative pole piece of a nickel-metal hydride battery. A nickel-metal hydride battery negative pole piece produced by this technology can be used to manufacture various types of nickel-hydrogen batteries, and is especially suitable for manufacturing various types of nickel-hydrogen batteries. Background technique [0002] At present, the negative electrode sheet used in the nickel-metal hydride battery manufactured by the existing battery industry is mainly composed of three parts: negative electrode active material coating, nickel-plated stainless steel mesh negative electrode current collector, and nickel strip negative electrode tab. There are significant deficiencies in the Ni-MH battery manufactured by the negative pole piece of this structure: [0003] First, due to the use of ordinary metal-hydrogen alloys, the manufactured elec...

Claims

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Application Information

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Patent Type & Authority Applications(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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