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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 composed 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 consisted 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 content 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

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 Lani3.70Co0.2Mno.3om10.15Cuo.65 alloy to improve the overall electrochemical properties with the decrement of the cost. Microstructures and electrochemical characteristics of Lani3.70Co0.2-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 containing 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 corrosion 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 consisted 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 corrosion resistance.

关键词： hydrogen storage alloy VFe alloy phase structure electrochemical property ni/mh batteries rare earths

Electrochemical performance of nickel hydroxide doped with multi-wall carbon nanotubes

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Transactions of Nonferrous Metals Society of China 2010年第S1期20卷 249-252页

作者：李延伟尹周澜姚金环赵卫民刘长久钟胜奎 School of Chemistry and Chemical Engineering Central South University College of Chemistry and Bioengineering Guilin University of Technology

nickel hydroxide doped with multi-wall carbon nanotubes(MCNTs)was synthesized by chemical coprecipitation method. The MCNTs doped nickel hydroxide was used as the electrochemical active material in the positive electrodes of rechargeable alkaline *** powder X-ray diffraction(XRD)analysis shows that the addition of MCNTs induces more structural defect within the crystal lattice of the nickel *** cyclic voltammetry(CV)and electrochemical impedance spectroscopy(EIS) tests demonstrate the better reaction reversibility and lower electrochemical impedance of MCNTs doped nickel hydroxide as compared with the pure nickel *** charge/discharge tests show that MCNTs addition can improve the specific discharge capacity and increase the discharge voltage of the nickel hydroxide electrode.

关键词： nickel hydroxide carbon nanotube ni/mh batteries specific capacity electrochemical impedance spectroscopy

Effect of carbon coating on electrochemical properties of AB_(3.5)-type La-Y-ni-based hydrogen storage alloys

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Journal of Rare Earths 2022年第8期40卷 1264-1271页

作者： Ran Wu Huiping Yuan Yuru Liu Zhenyu Hou Zhinian Li Shumao Wang Lijun Jiang Lei Hao National Engineering Research Center of Nonferrous Metals Materials and Products for New Energy GRINM Group Co.Ltd.Beijing 100088China GRIMAT Engineering Institute Co. Ltd.Beijing 101407China General Research Institute for Nonferrous Metals Beijing 100088China Institute for Advanced Materials and Technology University of Science&Technology BeijingBeijing 100083China

The superlattice La-Y-ni-based hydrogen storage alloys have high discharge capacity and are easy to ***,there is still a gap in commercial applications because of the severe corrosion of the alloys in electrolyte and poor high-rate dischargeability(HRD).Therefore,(LaSmY)(niMnAl)_(3.5) alloy was prepared by magnetic levitation induction melting,and then the alloy was coated with different contents(0.1 wt%-1.0 wt%) of nano-carbons by low-temperature sintering with sucrose as the carbon source in this *** results show that the cyclic stability and HRD of the alloy first increase and then decrease with the increase of carbon *** kinetic results show that the electrocatalytic activity and conductivity of the alloy electrodes can be enhanced by carbon *** electrochemical properties of the alloy are the best when the carbon coating content is 0.3 wt%.Compared with the uncoated alloy,the maximum discharge capacity(C_(max)) improves from 354.5 to 359.0 mAh/g,the capacity retention rate after 300 cycles(S_(300)) enhances from 73.15% to 80.01%,and the HRD_(1200) of the alloy enhances from 74.39% to 74.39%.

关键词： La-Y-ni-based alloy Sucrose Carbon coating Electrochemical properties ni/mh batteries Rare earths

Experiment Study on the Ending Criteria of Charge and Discharge of nickel-Hydride Battery

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Journal of Beijing Institute of Technology 2002年第1期11卷 56-60页

作者：孙逢春陈勇何洪文张承宁北京理工大学车辆与交通工程学院北京100081

Charge and discharge characteristics of ni/mh batteries are investigated with experiments. During battery’s working, the voltage, capacity, temperature and internal resistance were recorded, corresponding curves were depicted. Variations of the aforementioned four parameters are differently obvious. Ending criteria of charge and discharge of ni/mh batteries are discussed on the basis of the curves. Voltage, capacity and temperature of a battery can be used as ending criteria during charge. When discharge takes place, voltage, capacity and internal resistance can be chosen as ending criteria. As a whole, capacity is more suitable for being used as ending criteria of charge and discharge than the other three parameters. At last, the capacity of a battery is recommended to be ending criteria of charge and discharge. The conclusions will provide references to different capacity ni/mh batteries for electric vehicles.

关键词： electric vehicles ni/mh batteries charge and discharge characteristics charge and discharge criteria

Effect of the La/Nd ratio on the electrochemical properties of the La0. 70-xNdxPr0.05Mg0.25ni3.3Al0.1(x=0.05-0.20) hydrogen storage alloys

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Effect of the La/Nd ratio on the electrochemical properties ...