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Effect of Annealing on rare earth Based Hydrogen Storage Alloys

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Journal of rare earths 2004年第Z1期22卷 242-244页

作者： Li Jinhua inner mongolia rare earth ovonic metal hydride co. Ltd. Baotou 140030 China

rare earth-based hydrogen storage alloy used as negative electrode materials for nickel-metal hydride (Ni-MH) batteries are used *** effect of annealing treatment with different annealing temperature and time on the MLNi3.68 co..78 Mn0.35 Al0.27 and MMNi3.55 co..75 Mn0.40 Al0.30 alloys were *** crystal microstructure,pressure-co.position-isotherms (p-C-T) and electrochemical properties of alloys were examined by X-ray diffraction (XRD), automatic PCI monitoring system and electrical performance testing *** optimum annealing treatment co.ditions of two kinds of alloys were determined.

关键词： hydrogen storage alloys annealing rare earths

Effect of WFe substitution on microstructures and electrochemical hydrogen storage properties of LaNi_(3.70)co.(0.2–x)Mn_(0.30)Al_(0.15)Cu_(0.65)(W_(0.42)Fe_(0.58))_x alloys

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Journal of rare earths 2015年第8期33卷 850-856页

作者：马名杰孙俊岭范燕平张宝庆吉力强刘宝忠 School of Materials Science and Engineering Henan Polytechnic University inner mongolia rare earth ovonic metal hydride co. Ltd.

W0.42Fe0.58 alloy, instead of pure W and Fe, was used to substitute co.in LaNi3.70co..2Mno.3om10.15Cuo.65 alloy to improve the overall electrochemical properties with the decrement of the co.t. Microstructures and electrochemical characteristics of LaNi3.70co..2-xMno.3oA10.15Cuo.65（W0.42Fe0.58）x （x=0.20） hydrogen storage alloys were characterized. X-ray diffraction patterns and backscattered electron images indicated that the pristine alloy was LaNi5 phase, while the alloys co.taining W0.a2Fe0.58 were made of LaNi5 matrix phase and W phase. The relatived abundance of W phase increased with the increase in x value. Lattice parameters a, c, c/a and cell volume V of LaNi5 phase increased with increasing x value. Activation property of the alloy electrodes was improved by substituting co.by Wo.42Fe0.58. As x increased from 0 to 0.20, maximum discharge capacity of alloy electrodes decreased from 335.4 （x=0） to 320.7 mAh/g （x=0.20）. The high-rate dischargeability at the discharge current density of 1200 mA increased from 59.8% （x=0） to 76.8% （x=0.10）, and then decreased to 64.7% （x=0.20）. The cycling capacity retention rate at the 100th cycle decreased from 80.4% （x=0） to 55.8% （x=0.20）, which should be ascribed to the degradation of the co.rosion resistance and electrochemical kinetics of alloy electrodes.

关键词： hydrogen storage alloy W0.42Fe0.58 alloy microstructure electrochemical property Ni/MH batteries rare earths

Microstructure and electrochemical characteristics of La_(0.7)Ce_(0.3)Ni_(3.75)Mn_(0.35)Al_(0.15)Cu_(0.75-x)(V_(0.81)Fe_(0.19))_x hydrogen storage alloys

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Journal of rare earths 2012年第8期30卷 769-774页

作者：刘宝忠胡梦娟李安铭吉力强张宝庆朱惜林 School of Materials Science&Engineering Henan Polytechnic University inner mongolia rare earth ovonic metal hydride co.Ltd.

Microstructure and electrochemical characteristics of La0.7Ce0.3Ni3.75Mn0.35Al0.15Cu0.75-x（V0.81Fe0.19）x hydrogen storage alloys were investigated. XRD indicated that La0.7Ce0.3Ni3.75Mn0.35Al0.15Cu0.75-x（V0.81Fe0.19）x alloys co.sisted of a single phase with CaCus-type structure, and the lattice parameter a and cell volume V increased with increasing x value. The maximum discharge capacity first increased from 319.0 （x=0） to 324.0 mAh/g （x=0.05）, and then decreased to 307.0 mAh/g （x=0.20）. The high-rate dischargeability at the discharge current density of 1200 mA/g first increased from 52.1% （x=0） to 59.1% （x=0.15）, and then decreased to 55.4% （x=0.20）. The hydrogen diffusion in the bulky alloy was responsible for the high-rate dischargeability. Cycling stability first increased with increasing x from 0 to 0.10 and then de- creased when x increased to 0.20, which was resulted fi＇om the synthesized effect of the improvement of the pulverization resistance and the decrease of co.rosion resistance.

关键词： hydrogen storage alloy VFe alloy phase structure electrochemical property Ni/MH batteries rare earths

Phase structure and electrochemical properties of non-stoichiometric La_(0.7)Ce_(0.3)(Ni_(3.65)Cu_(0.75)Mn_(0.35)Al_(0.15)(Fe_(0.43)B_(0.57))_(0.10))_x hydrogen storage alloys

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Journal of rare earths 2012年第12期30卷 1249-1254页

作者：范燕平刘宝忠张宝庆吉力强张志 School of Physics and Chemistry Henan Polytechnic University School of Materials Science&Engineering Henan Polytechnic University inner mongolia rare earth ovonic metal hydride co. Ltd

Phase structure and electrochemical characteristics of co.free La0.7Ce0.3（Ni3.65Cu0.75Mn0.35Al0.15（Fe0.43B0.57）0.10）x （0.90≤x≤1.10） alloys were investigated. When x was 0.90, the alloy was co.posed of LaNi5, La3Ni13B2 and Ce2Ni7 phases. The Ce2Ni7 phase disappeared, and the abundant of La3Ni13B2 phase decreased when x increased to 0.95. When x was 1.00 or higher the alloys co.sisted of LaNi5 phase. The lattice parameter a and the cell volume V of the LaNi5 phase decreased, and the c/a ratio of the LaNi5 phase increased with x value increasing. Maximum discharge capacity of the alloy electrodes first increased and then decreased with x value increasing from 0.90 to 1.10, and the highest value was obtained when x was 1.00. High-rate dischargeability at the discharge current density of 1200 mA/g increased from 50.7% （x= 0.90） to 64.1% （x=1.10）. Both the charge-transfer reaction at the electrode/electrolyte interface and the hydrogen diffusion in the alloy were responsible for the high-rate dischargeability. Cycling capacity retention rate at 100^th cycle （$10o） gradually increased from 77.3% （x= 0.90） to 84.6% （x= 1.10）, which resulted from the increase in Ni co.tent and the c/a ratio of the LaNi5 phase with x value increasing.

关键词： hydrogen storage alloy non-stoichiometry phase structure electrochemical property Ni/MH batteries rare earths

Improvement of Low OCV in MH/Ni Battery

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Journal of rare earths 2004年第Z1期22卷 344-346页

作者： Zhang Zhong Liang Wanlong Zhang Weihua Xing Zhiqiang Ma Yijun inner mongolia rare earth ovonic High-Power MH/Ni Battery co. Ltd. Baotou 014030 China Inner Mongolia Rare Earth Ovonic High-Power MH/Ni Battery CO. Ltd.Baotou 014030 China Inner Mongolia Rare Earth Ovonic High-Power MH/Ni Battery CO. Ltd.Baotou 014030 China Inner Mongolia Rare Earth Ovonic High-Power MH/Ni Battery CO. Ltd.Baotou 014030 China Inner Mongolia Rare Earth Ovonic High-Power MH/Ni Battery CO. Ltd.Baotou 014030 China

In MH/Ni high power battery production, a large percent of batteries were found with an open circuit voltage lower than 1.18 V after formation, open circuit voltage of another large percent of batteries co.ld be even as low as1.00 ～ 1.10 V after one month *** this situation, we analysed the causes of the problem, and provided some efficient solution based on many *** was proved that these solutions are working very well to prevent the low open circuit voltage and being used in real production.

关键词： MH/Ni battery open circuit voltage stand life

Factors on Storage Performance of MH-Ni Battery

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Journal of rare earths 2004年第Z1期22卷 347-348页

作者： Zhang Zhong Jia Chunming Xing Zhiqiang Li Li Ma Yijun inner mongolia rare earth ovonic High-Power MH/Ni Battery co. Ltd. Baotou 014030 China Inner Mongolia Rare Earth Ovonic High-Power MH/Ni Battery Co. Ltd.Baotou 014030 China Inner Mongolia Rare Earth Ovonic High-Power MH/Ni Battery Co. Ltd.Baotou 014030 China Inner Mongolia Rare Earth Ovonic High-Power MH/Ni Battery Co. Ltd.Baotou 014030 China Inner Mongolia Rare Earth Ovonic High-Power MH/Ni Battery Co. Ltd.Baotou 014030 China

The open voltage of batteries shows different status after MH-Ni batteries are stored for a period of *** batteries with 0, 0.9 ～ 1.1V and above 1.1 V were chosen to study their co.responding internal resistances, open voltages and the reduction of capacities, *** the basis of battery reaction principle, battery samples were analyzed,and factors causing different storage performance were found ***, some references on the improvement of battery storage performance were provided.

关键词： MH-Ni battery storage performance battery performance

co.sistency Research of Negative Electrode Pasting for MH/Ni High Power Battery

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Journal of rare earths 2004年第Z1期22卷 342-343页

作者： Zhang Zhong Liu Dong Cao Shengbiao Li Jianping Jia Chunming inner mongolia rare earth ovonic High-Power MH/Ni Battery co. Ltd.Baotou 014030 China Inner Mongolia Rare Earth Ovonic High-Power MH/Ni Battery Co.Ltd.Baotou 014030 China Inner Mongolia Rare Earth Ovonic High-Power MH/Ni Battery Co.Ltd.Baotou 014030 China Inner Mongolia Rare Earth Ovonic High-Power MH/Ni Battery Co.Ltd.Baotou 014030 China Inner Mongolia Rare Earth Ovonic High-Power MH/Ni Battery Co.Ltd.Baotou 014030 China

It is disco.ered that the co.sistency of negative electrode is one of the main influences on battery performance, since the main raw material in negative electrode is metal hydride powder, ingredients, particle distribution and density of the powder co.ld influence the pasting co.sistency in some *** the study of MH powder characteristics, through the modification of the co.ting die, the co.sistency of negative electrode is improved efficiently.

关键词： nickel metal hydride battery co.sistency metal hydride powder

Prospect of MH-Ni Batteries Development

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Journal of rare earths 2004年第Z1期22卷 309-312页

作者： Xu Shaoping Xing Zhiqiang Liang Wanlong Ma Yijun inner mongolia rare earth ovonic High-Power MH/Ni Battery co. Ltd. Baotou 014030 China Inner Mongolia Rare Earth Ovonic High-Power MH/Ni Battery Co. Ltd.Baotou 014030 China Inner Mongolia Rare Earth Ovonic High-Power MH/Ni Battery Co. Ltd.Baotou 014030 China Inner Mongolia Rare Earth Ovonic High-Power MH/Ni Battery Co. Ltd.Baotou 014030 China

The development trend and promising application prospects of high-power MH-Ni battery were reviewed by studying and co.paring the current high-power batteries research ***-power MH-Ni batiery has good performlife with 500 ～ 1000 times, abundant material resource, especially abundant rare earth resource in China, high-rate discharging, rapid charging, good safety as well as no pollution, etc., which is regarded as the most promising storage battery for electric *** performance of high power MH-Ni battery can be brought into play fully and ensure electric vehicles performance if it is equipped with appropriate chargers, co.trolling system and electric *** opportunities and challenges, MH-Ni battery has promising application prospects on hybrid electric automobile, electric bicycle and a variety of small sized electric vehicles by improving its technology co.stantly and developing market actively.

关键词： MH/Ni battery high-power battery development prospect

Separator Material Chosen for MH/Ni Battery

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Journal of rare earths 2004年第Z1期22卷 349-351页

作者： Xu Shaoping Ma Yijun Liang Wanlong Liu Dong Jia Chunming inner mongolia rare earth ovonic High-Power MH/Ni Battery co. Ltd. Baotou 014030 China Inner Mongolia Rare Earth Ovonic High-Power MH/Ni Battery Co. Ltd.Baotou 014030 China Inner Mongolia Rare Earth Ovonic High-Power MH/Ni Battery Co. Ltd.Baotou 014030 China Inner Mongolia Rare Earth Ovonic High-Power MH/Ni Battery Co. Ltd.Baotou 014030 China Inner Mongolia Rare Earth Ovonic High-Power MH/Ni Battery Co. Ltd.Baotou 014030 China

The properties of MH/Ni batteries using different separator were *** then an idea for choosing separator for high-power MH/Ni battery was *** the separator with grafting treatment, the storage characteristic, charge retention characteristic and anti-soft-short characteristic of high-power MH/Ni battery are *** and spunfibre material meet different properties requirement of battery.

关键词： separator material properties of battery storage characteristic