Effect of the Sm content on the structure and electrochemical properties of La1.3 ? xSmxCaMg0.7Ni9 (x = 0–0.3) hydrogen storage alloys |
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| Affiliation: | 1. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an, 710049, China;2. School of Electronic and Information Engineering, Xi’an Jiaotong University, Xi’an, 710049, China;1. Fujian Provincial Key Laboratory of Functional Materials and Applications, Xiamen University of Technology, Xiamen, 361024, China;2. School of Materials Science and Engineering, Xiamen University of Technology, Xiamen, 361024, China;3. Institute of Advanced Wear & Corrosion Resistance and Functional Materials, Jinan University, Guangzhou, 510632, China;1. School of Materials Science and Engineering, South China University of Technology, Key Laboratory of Advanced Energy Storage Materials of Guangdong Province, Guangzhou 510640, PR China;2. National Center for Electron Microscopy, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States;3. Department of Physics, South China University of Technology, Guangzhou 510640, PR China;4. Institute of Physics, Chinese Academy of Sciences, Beijing 100080, PR China;5. Center of Electron Microscopy and State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, PR China;1. Stanford University School of Medicine, Stanford, California;2. National Bureau of Economic Research, Cambridge, Massachusetts;3. Division of Research, Kaiser Permanente Northern California, Oakland, California;1. School of Materials Science and Engineering, Key Laboratory of Nonferrous Materials and New Processing Technology of Ministry of Education, Guilin University of Technology, Guilin 541004, China;2. The State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China;3. Nano and Ceramic Materials Research Center, Wuhan Institute of Technology, Wuhan 430073 China |
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| Abstract: | La1.3 ? xSmxCaMg0.7Ni9 (x = 0–0.3) hydrogen storage alloys were prepared by inductive melting and the effect of the Sm content on the structure and electrochemical properties was investigated in the paper. The Sm substitution for La in La1.3 ? xSmxCaMg0.7Ni9 (x = 0–0.3) alloys does not change the main phase structure (the rhombohedral PuNi3-type structure), but leads to a shrinkage of unit cell and a decrease of hydrogen storage capacity. With the increase of the Sm content in the alloys, the maximum discharge capacity of electrode decreases from 400.2 (x = 0) to 346.6 mAh g?1 (x = 0.3), but the high-rate dischargeability and cycling stability is improved. After 100 cycles, the capacity retention rate increases from 75 (x = 0) to 85% (x = 0.3). |
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