Influence of over-stoichiometry on hydrogen storage and electrochemical properties of Sm-doped low-Co AB(5)-type alloys as negative electrode materials in nickel-metal hydride batteries

时间:2022-01-04作者:浏览量:75


Influence of over-stoichiometry on hydrogen storage and electrochemical properties of Sm-doped low-Co AB(5)-type alloys as negative electrode materials in nickel-metal hydride batteries

作者

Chen, M (Chen, Min) 1

Tan, C (Tan, Cheng) 1

Jiang, WB (Jiang, Wenbin) 1

Huang, JL (Huang, Jianling) 1

Min, D (Min, De) 2

Liao, CH (Liao, Canhui) 2

Wang, H (Wang, Hui) 1

Liu, JW (Liu, Jiangwen) 1

Ouyang, LZ (Ouyang, Liuzhang) 1

Zhu, M (Zhu, Min) 1

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卷867

文献号159111

DOI10.1016/j.jallcom.2021.159111

出版时间JUN 25 2021

文献类型Article

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.


关键词

作者关键词Ni-MH batteryHydrogen storage alloyOver-stoichiometrySamarium doping

作者信息

通讯作者地址

Ouyang, Liuzhang

(通讯作者)

South China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510641, Peoples R China

地址

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

电子邮件地址meouyang@scut.edu.cn

类别/分类

研究方向ChemistryMaterials ScienceMetallurgy & Metallurgical Engineering