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Influence of over-stoichiometry on hydrogen storage and electrochemical properties of Sm-doped low-Co AB5-type alloys as negative electrode materials in nickel-metal hydride batteries
被引:25
作者:

Chen, Min
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South China Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510641, Peoples R China South China Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510641, Peoples R China

Tan, Cheng
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South China Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510641, Peoples R China South China Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510641, Peoples R China

Jiang, Wenbin
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South China Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510641, Peoples R China South China Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510641, Peoples R China

Huang, Jianling
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South China Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510641, Peoples R China South China Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510641, Peoples R China

Min, De
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机构:
Sihui City Double Win Ind CO LTD, Sihui, Peoples R China South China Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510641, Peoples R China

Liao, Canhui
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Sihui City Double Win Ind CO LTD, Sihui, Peoples R China South China Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510641, Peoples R China

Wang, Hui
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机构:
South China Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510641, Peoples R China South China Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510641, Peoples R China

Liu, Jiangwen
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机构:
South China Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510641, Peoples R China South China Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510641, Peoples R China

Ouyang, Liuzhang
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机构:
South China Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510641, Peoples R China South China Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510641, Peoples R China

Zhu, Min
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h-index: 0
机构:
South China Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510641, Peoples R China South China Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510641, Peoples R China
机构:
[1] South China Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510641, Peoples R China
[2] Sihui City Double Win Ind CO LTD, Sihui, Peoples R China
基金:
国家重点研发计划;
中国国家自然科学基金;
关键词:
Ni-MH battery;
Hydrogen storage alloy;
Over-stoichiometry;
Samarium doping;
D O I:
10.1016/j.jallcom.2021.159111
中图分类号:
O64 [物理化学(理论化学)、化学物理学];
学科分类号:
070304 ;
081704 ;
摘要:
The La0.582Ce0.191Zr0.025Sm0.202(Ni0.849Co0.032Mn0.05Al0.069)(5+x) (x = 0.00, 0.10, 0.20, 0.35 or 0.47) hydrogen storage alloys are firstly synthesized to explore the influence of over-stoichiometry on crystal structure and electrochemical performance for nickel-metal hydride (Ni-MH) battery anodes. These alloys possess major CaCu5-type AB(5) and minor BiF3-type Ni2MnAl phases. The decreasing of cell volume and charge acceptance ability of the alloy electrodes reduces capacity and peak power density. Meanwhile, the decreasing of MH stability results in the poorer charge retention rate. The enhanced anti-pulverization property of larger anisotropic factor (c/a) and the weakened electrode polarization promote the cycle stability. Moreover, the higher discharge plateau potential is beneficial to the discharge capacity at - 20 and - 40 degrees C. The high rate discharge ability (HRD) and initial voltage drop decrease at first and then increase because of the changing rate-determining factor of HRD with the shifted x. (C) 2021 Elsevier B.V. All rights reserved.
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