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A kind of deep-discharge resistant nickel-metal hydride battery and its preparation method

A nickel-metal hydride battery, deep discharge technology, applied in nickel storage battery, alkaline storage battery manufacturing, battery, etc., can solve the problem of battery capacity drop and so on

Active Publication Date: 2019-03-22
LIAONING JIUYI ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems existing in the prior art, the present invention provides a deep-discharge-resistant nickel-metal hydride battery and a preparation method thereof. The positive electrode adopts cobalt oxyhydroxide-coated spherical nickel with an oxidation degree of 8-12%, and the negative electrode adopts nickel with low hydrogen absorption and desorption. The platform pressure hydrogen storage alloy effectively solves the problem that the battery capacity of the current nickel-metal hydride battery drops significantly after deep discharge, and prolongs the storage period of the nickel-metal hydride battery

Method used

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  • A kind of deep-discharge resistant nickel-metal hydride battery and its preparation method
  • A kind of deep-discharge resistant nickel-metal hydride battery and its preparation method
  • A kind of deep-discharge resistant nickel-metal hydride battery and its preparation method

Examples

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Effect test

Embodiment 1

[0029] Embodiment 1 A kind of deep discharge resistant Ni-MH battery (AA1200mAh)

[0030] Its preparation method is as follows:

[0031] 1) Preparation of positive electrode sheet

[0032] Cobalt oxyhydroxide spherical nickel (the degree of oxidation is 10%), ytterbium oxide (Yb 2 o 3 ) and carboxymethyl cellulose (CMC) are uniformly mixed in proportions of 98%, 1.5%, and 0.5% by weight, then add water of 0.2 times the weight of the mixture to make a slurry, coat it on foamed nickel, and dry dried, cut into a size of 95mm×42mm×0.6mm, and made into a positive electrode sheet.

[0033] 2) Preparation of negative electrode sheet

[0034] A hydrogen storage alloy (P (H / M＝0～0.1) 0.008Mpa, 40℃, P (H / M＝0.5) 0.018Mpa, 40°C), conductive agent (acetylene black), carboxymethylcellulose (CMC), hydroxypropylmethylcellulose (HPMC) and styrene-butadiene rubber (SBR) are 97.7% by weight, 0.3% , 0.2%, 0.3%, and 1.5% are mixed evenly, then add 0.13 times the weight of the mixture to make...

Embodiment 2

[0037] Example 2 AA1200mAh

[0038] Only replace the outer-coated cobalt oxyhydroxide spherical nickel of the positive electrode with conventional cobalt-coated spherical nickel, and replace the hydrogen storage alloy of the low absorption and desorption platform of the negative electrode with a conventional hydrogen storage alloy; the rest of the steps are the same as in Example 1, and finally prepared Finished battery.

Embodiment 3

[0039] Example 3 AA1200mAh

[0040] Only the outer-coated cobalt oxyhydroxide spherical nickel of the positive electrode was replaced with conventional cobalt-coated spherical nickel; the rest of the steps were the same as in Example 1, and finally a finished battery was prepared.

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Abstract

The invention discloses a deep-discharge-resistant nickel-hydrogen battery, which has a positive electrode and a negative electrode. The positive electrode is coated with cobalt oxyhydroxide spherical nickel, and the oxidation degree of the coated cobalt oxyhydroxide spherical nickel is 8-12%; the negative electrode A hydrogen storage alloy with a low hydrogen absorption and desorption platform is adopted, and the P of the hydrogen storage alloy of the low hydrogen absorption and desorption platform is (H / M＝0～0.1) 0.005~0.008Mpa, 40℃, P (H / M＝0.5) 0.01-0.02Mpa, 40°C. The invention adopts the nickel-metal hydride battery produced by the above materials. After the battery is deeply discharged or placed for a long time, the battery can recover to more than 95% of its original capacity after charging.

Description

technical field [0001] The invention relates to the field of nickel-hydrogen batteries, in particular to a deep-discharge-resistant nickel-hydrogen battery and a preparation method thereof. Background technique [0002] Ni-MH batteries have high energy density, power density, long cycle life and environmental friendliness, and have become an ideal alternative power source for Ni-Cd batteries. They have been widely used in mobile communications, notebook computers, power tools, Personal care products and electric vehicles, etc. Most electrical appliances have no voltage cut-off device during battery use or the battery is stored for a long time after the discharge voltage is cut off, and the battery capacity will drop a lot, especially at higher temperatures. Contents of the invention [0003] Aiming at the problems existing in the prior art, the present invention provides a deep-discharge-resistant nickel-metal hydride battery and a preparation method thereof. The positive...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/60H01M10/30H01M10/28
CPCH01M4/38H01M4/383H01M4/60H01M10/28H01M10/30H01M2220/20H01M2220/30Y02E60/10Y02P70/50
Inventor 成鹏庞柳萍
Owner LIAONING JIUYI ENERGY TECH