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Film electrode for nickel-hydrogen battery and its prepn

A thin-film electrode and nickel-metal hydride battery technology, applied in the direction of alkaline storage battery electrodes, etc., can solve the problems of difficult control of composition, unsuitable for mass production, poor repeatability, etc., to overcome uneven composition, flexible control of size and composition, and good The effect of corrosion resistance

Inactive Publication Date: 2004-11-03
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Not only that, the current films prepared by co-sputtering or co-deposition of magnesium targets and nickel targets are difficult to control the composition, have poor repeatability, and are not suitable for mass production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The block 45wt% magnesium and 55%wt nickel are smelted into alloy castings by induction melting method. After high temperature annealing, they are processed into target materials by wire cutting method. They are deposited on silicon wafers by laser evaporation with a film thickness of 1 μm and replaced with Pt target, a 20nm Pt layer was vapor-deposited on this film.

Embodiment 2

[0014] The block 45wt% magnesium and 55%wt nickel are smelted into alloy castings by induction melting method. After high temperature annealing, they are processed into target materials by wire cutting method. They are sputtered on the glass sheet by magnetron sputtering with a film thickness of 3 μm and replaced with Pd target, a 50nm Pd layer was vapor-deposited on this film.

Embodiment 3

[0016] Melt blocky 55%wt magnesium and 45wt% nickel into alloy castings by induction melting method, after high temperature annealing, process them into targets by wire cutting method, and sputter on 2.5mm thick nickel sheet by magnetron sputtering, the film thickness is 20μm , replace the Pd target, and vapor-deposit a 100nm Pd layer on the film.

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PUM

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Abstract

A film electrode is composed of a basis film with the main composition of magnesium (Mg) and nickel (Ni) whose chemistry component is Mg[p-x]A[x]Ni[1-y]B[y] and a protecting film consisting of Pd Pt Ag Au, Co or two elements or mere alloy. The preparation is to pre-prepare an alloy target with induced smelting or powder metallurgical method first and then to process the basis film on a basis chip with physical gas phase sedimentation to be covered by a layer of protecting film, which can be used as the negative pole of fine film crystal particle (a bout50nm) with big specific surface area, high sensing film to hydrogen, good dynamic performance, therefore to save the space occupied by the foam Ni in the traditional cells to raise the energy density of the NiH cells.

Description

(1) Technical field [0001] The invention relates to the technical field of physical vapor deposition synthesis thin film materials, in particular to a thin film electrode for a nickel-hydrogen battery and a preparation method thereof. (2) Background technology [0002] At present, the global annual output of Ni-MH batteries has reached more than one billion, but the specific energy density and high-rate discharge capacity of Ni-MH batteries still need to be improved. To this end, the development of nickel metal hydride battery anode materials is a key technology. Among the several types of hydrogen storage electrode alloys currently being studied for nickel-hydrogen batteries, Mg-based alloys have excellent prospects, among which Mg 2 The theoretical electrochemical capacity of Ni reaches 1000mAh / g, which is much higher than other types of hydrogen storage alloys, and the price is much lower than other alloy systems. Therefore, the development of Mg-based alloys has very a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/26H01M4/32
CPCY02E60/124Y02E60/10
Inventor 朱敏钟志源欧阳柳章曾美琴王辉
Owner SOUTH CHINA UNIV OF TECH