Multi-layer film electrode for nickle-hydrogen cell and preparation method thereof

A multi-layer film, nickel-metal hydride battery technology, applied in the direction of alkaline battery electrodes, etc., can solve the problems of single film breakage, poor high-power discharge capacity, etc., achieve flexible control of size and composition, increase charge and discharge rate, overcome composition uneven effect

Inactive Publication Date: 2006-11-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the shortcomings in the above-mentioned prior art, to provide a multilayer thin film electrode for a nickel-metal hydride battery and a preparation method thereof, in which the surface of the electrode is covered with a multilayer protective layer. The enhancement effect and the role of nano-catalysis solve the shortcomings of poor high-power discharge capability and easy damage of a single film, and further extend the cycle life of the film electrode

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The block 44% magnesium, 55% nickel and 1% zirconium (weight percentage, the same below) is smelted into an alloy casting by induction melting method. First, a 10nm Pt layer is evaporated, and then a base film is evaporated, with a thickness of 100nm, and a Pt target is replaced, a 10nm Pt layer is evaporated on the base film, and the above steps are repeated to obtain 10 layers of Mg-Ni-Zr base film A multi-layer film alternately arranged with 11 layers of Pt catalytic protective films.

Embodiment 2

[0014] Melt blocky 45% magnesium, 54% nickel and 1% aluminum into alloy castings by induction melting method, after high temperature annealing, process it into target material by wire cutting method, and sputter on glass sheet by magnetron sputtering, firstly, vapor-deposit 10nm Pd layer, the thickness of each base film is 50nm, replace the Pd target, vapor-deposit a 10nm Pd layer on this film, repeat the above steps, get 10 layers of Mg-Ni-Al base film and 11 layers of Pd catalytic protective film Alternately arranged multi-layer films, followed by evaporation of a base film with a thickness of 100nm, replaced with a Pt target, and a 10nm Pt layer was evaporated on the base film, and the above steps were repeated to obtain 10 layers of Mg-Ni-A1 base film and 10 layers of The Pt catalytic protective film is alternately arranged as a multi-layer film, and the film as a whole is 20 layers of base film and 21 layers of protective catalytic film.

Embodiment 3

[0016] The block 54% magnesium, 44% nickel, 1% vanadium and 1% manganese are smelted into alloy castings by induction melting method. After high temperature annealing, they are processed into target materials by wire cutting method. on nickel sheet. First, vapor-deposit a 20nm Pd layer, then vapor-deposit a substrate film with a thickness of 20nm, replace it with a Pd target, vapor-deposit a 20nm Pd layer on this film, and repeat the above steps to obtain 20 layers of Mg-Ni-V-Mn substrate A multilayer film with alternately arranged thin films and 21 layers of Pd catalytic protective films, followed by evaporation of a base film with a thickness of 20nm, replaced by MmNi 3.5 co 1.2 al 0.2 mn 0.1 target, 50nm MmNi was evaporated on this film 3.5 co 1.2 al 0.2 mn 0.1 Layer, repeat the above steps to get 20 layers of Mg-Ni-V-Mn matrix film and 20 layers of MmNi 3.5 co 1.2 al 0.2 mn 0.1 A multilayer film with alternately arranged catalytic protective films, the total fil...

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Abstract

This invention is a nickel hydrogen battery using multilayer electrode and manufacturing method, the film electrode is composed of matrix film and safety film, the components of the matrix film are magnesium and nickel, the chemical composing is Mg[p-x]A[x]Ni[1-y]B[y],the safety film is single or binary or complex alloy in the catalyst safety film of Pd, Pt, Ag, Au, Co, C[1-r]Mg[r]Ni[t-q]D[q]. This preparation method first uses induction melting or powder smelting methods to pre-manufacture the alloy target, then adopts the physical gaseous deposition method to make the matrix film on the base plate, deposit the catalyzing safety film on the surface of the matrix film, and repeat the above processes to get the multilayer film. This film can be used to the negative pole of nickel hydrogen battery, and its characteristics are that the film crystal particle is small, the specific surface is large, the discharging performance is fine, the nanometer multilayer complex has complex reinforcing effect and multilayer catalyzing function, the service life of the electrode is long; it can be integrated in the micro machinery and provides the power support to the micro apparatus.

Description

technical field [0001] The invention relates to the technical field of physical vapor deposition synthetic thin film materials, in particular to a multilayer thin film electrode for a nickel-hydrogen battery and a preparation method thereof. Background technique [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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/24H01M4/32H01M4/26
CPCY02E60/10
Inventor 欧阳柳章王辉彭成红朱敏
Owner SOUTH CHINA UNIV OF TECH
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