La-Mg-Ni negative hydrogen storage material for nickel-hydrogen batteries
A technology for hydrogen storage materials and nickel-metal hydride batteries, applied in battery electrodes, nickel storage batteries, alkaline storage battery electrodes, etc.
Inactive Publication Date: 2010-01-13
北京宏福源科技有限公司
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For this reason, people have done a lot of work, such as coating cobalt on the positive electrode powder, improving the separator and electrolyte, adding some stability additives to the positive and negative electrodes, etc. These works have indeed played a role in improving the self-discharge characteristics of Ni-MH batteries. , but still did not fundamentally solve the problem
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[0048] The present invention will be further described below in combination with specific embodiments. However, it should be understood that the following embodiments are only used to illustrate the present invention rather than limit the scope of the present invention.
[0049] According to the weight percentages of the alloy elements in Table 1, the prepared alloy raw materials are smelted and cast in an induction furnace protected by argon after vacuuming, and then the ingot is passed into an argon-protected induction furnace after vacuuming. The homogenization treatment is carried out in a gas-protected heat treatment furnace, the treatment temperature is 1020 ° C, the holding time is 8 hours, and the ingot is taken out after the furnace is cooled to room temperature.
[0050] Table 1 The embodiment of the present invention and the composition comparison (wt%) of prior art
[0051]
[0052] X-ray diffraction results show that the compound is mainly composed of Pr 5 co...
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Abstract
The invention provides an La-Mg-Ni negative hydrogen storage material for nickel-hydrogen batteries with ultra-low self discharge and durable memory property. The La-Mg-Ni negative hydrogen storage material comprises constituents in an atomic ratio: La (0.65-x-y) Ndx, Dyy Ce0.1 Mg0.25, Ni3.27 and Al0.13, wherein x is larger than or equal to 0.1 and smaller than or equal to 0.3; and y is larger than or equal to 0.01 and smaller than or equal to 0.05. The La-Mg-Ni negative hydrogen storage material is a compound in a complex-phase structure, and the phase composition mainly comprises two different A5B19 type compounds in different structures with different space groups, wherein one compound is in a Pr6Co19 structure in a space group of P63 / mmc, the other compound is in a Ce5Co19 structure in a space group of R-3m, and a ratio of the two compounds is about 6:4. In addition, the La-Mg-Ni negative hydrogen storage material also comprises a small amount of Ce2Ni7 type and PuNi3 type structural compounds and can be used as a negative electrode material for preparing the nickel-hydrogen batteries with ultra-low self discharge and durable memory property.
Description
technical field [0001] The invention relates to a negative electrode hydrogen storage material of a nickel-hydrogen battery, in particular to a La-Mg-Ni type nickel-hydrogen battery negative electrode hydrogen storage material. technical background [0002] Since the metal hydride-nickel battery was put into the market in the 1990s, due to its high capacity, long life, no memory effect, and no environmental pollution, it has been widely welcomed and its market share is increasing. The type of batteries has also developed from AA and AAA ordinary batteries to other types. The products are widely used in electric tools, household appliances, computers, aerospace, communications and mopeds, etc., and the development is very rapid. With the increase in the application fields of metal hydride-nickel batteries, the requirements for battery performance are also getting higher and higher. Especially in recent years, people have gradually realized that the storage performance and se...
Claims
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IPC IPC(8): H01M4/38C22C19/03H01M4/26H01M10/30
CPCY02E60/12Y02E60/124Y02E60/10
Inventor 刘华福李蓉吴建民
Owner 北京宏福源科技有限公司