Reducing the electrochemical capacity decay of milled Mg-Ni alloys: The role of stabilizing amorphous phase by Ti-substitution

Reducing the electrochemical capacity decay of milled Mg-Ni alloys: The role of stabilizing amorphous phase by Ti-substitution

作者:Huang, JL (Huang, Jianling)[ 1 ] ; Wang, H (Wang, Hui)[ 1 ] ; Ouyang, LZ (Ouyang, Liuzhang)[ 1 ] ; Liu, JW (Liu, Jiangwen)[ 1 ] ; Zhu, M (Zhu, Min)[ 1 ]

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JOURNAL OF POWER SOURCES

卷: 438

文献号: 226984

DOI: 10.1016/j.jpowsour.2019.226984

出版年: OCT 31 2019

文献类型:Article

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摘要

MgNi-based alloys have high electrochemical capacity as anode of nickel-metal hydride (Ni/MH) battery (>= 500 mAh g(-1)). However the capacity decay seriously in charge-discharge cycling, which is previously ascribed to the corrosion of Mg. To solve this problem and reveal the related mechanism, the electrochemcial properties of Mg0.50Ni0.50, Mg0.45Ti0.05Ni0.05 and Mg0.40Ti0.10Ni0.50 alloys are studied in combination with their hydrogen storage properties and microstuctural evolution during cycling. This work demonstrates the amorphous phase in milled Mg0.45Ti0.05Ni0.50 and Mg0.40Ti0.10Ni0.50 alloys has higher resistance to hydrogenation-induced crystallization than milled Mg0.50Ni0.50 alloy. Thus, they show better hydrogen absorption/desorption reversibility and contribute to the reversible electrochemical capacity. Therefore, the cycle performance of the Mg0.50Ni0.50 alloy electrodes shows obvious improvement after partially substituting Mg by Ti. The capacity retention rate increases from 24.0% (Mg0.50Ni0.50) to 55.7% (Mg0.40Ti0.10Ni0.50) after 30 cycles. In addition, the Ti addition results in the formation of TiNi phase, and thus, the alloys show better electrochemical reaction kinetics and their high-rate dischargeability (HRD) is significantly improved. At 300 mA g(-1), the HRD values of Mg0.50Ni0.50, Mg0.45Ti0.05Ni0.50 and Mg0.40Ti0.10Ni0.50 alloys are 41.7%, 83.7% and 90.3%, respectively. At higher discharge current density of 1200 mA g(-1), the HRD values are 26.7%, 34.8% and 46.2%, respectively.

关键词

作者关键词:Mg-based alloy; Amorphous phase; Crystallization; Electrochemical performances

KeyWords Plus:HYDROGEN STORAGE ALLOYS; SURFACE MODIFICATION; LOW-TEMPERATURE; CYCLE LIFE; ELECTRODES; PERFORMANCE; MECHANISM; IMPEDANCE; BEHAVIOR; ZR

作者信息

通讯作者地址: Zhu, M (通讯作者)

显示更多South China Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510641, Guangdong, Peoples R China.

地址:

显示更多[ 1 ] South China Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510641, Guangdong, Peoples R China

电子邮件地址:memzhu@scut.edu.cn

基金资助致谢

基金资助机构显示详情授权号

National Natural Science Foundation of China

51621001

National Natural Science Foundation of China

51471070

51431001

51727801

51571091

National Natural Science Foundation of Guangdong Province

2014A030311004

Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme (2014)  

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出版商

ELSEVIER, RADARWEG 29, 1043 NX AMSTERDAM, NETHERLANDS

期刊信息

Impact Factor (影响因子): Journal Citation Reports

类别 / 分类

研究方向:Chemistry; Electrochemistry; Energy & Fuels; Materials Science

Web of Science 类别:Chemistry, Physical; Electrochemistry; Energy & Fuels; Materials Science, Multidisciplinary