Citation: TANG Zheng-Yao, ZHOU Wan-Hai, ZHU Ding, WU Chao-Ling, HUANG Li-Wu, LIU Kun, CHEN Yun-Gui. Effects of Al Content on Low-Temperature and High-Rate Performance of MmNi_4.0-xCo_0.7Mn_0.3Al_x Alloys[J]. Chinese Journal of Inorganic Chemistry, ;2017, 33(10): 1881-1888. doi: 10.11862/CJIC.2017.228 shu

Effects of Al Content on Low-Temperature and High-Rate Performance of MmNi_4.0-xCo_0.7Mn_0.3Al_x Alloys

1.
College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China
2.
Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610065, China

Corresponding author: CHEN Yun-Gui, ygchen60@aliyun.com
Received Date: 26 May 2017
Revised Date: 4 September 2017

Figures(5)

Effects of Al content on the comprehensive electrochemical performance of Ce-rich MmNi_4-xCo_0.7Mn_0.3Al_x (x=0, 0.1, 0.2, 0.3) hydrogen storage alloys, particularly the low-temperature and high-rate capacity have been systematically investigated. At room temperature, both the discharge capacity and cycling stability of the electrode increase with the Al content increases, but the high-rate dischargeability seriously deteriorates. The discharge capacity still increases with the increase of Al content at -20℃, but gradually deteriorates when the temperature drops down to -40℃. Electrochemical kinetics results demonstrate that the high-rate capacity recession of the high-Al alloy at room temperature is contributed to the deterioration of the charge-transfer process. When the temperature drops down to -40℃, Al deteriorates both the surface catalytic ability and the bulk hydrogen diffusion ability, leading to the severe drop of discharge capacity and potential of the high-Al alloy. Based on the comprehensive electrochemical properties of the electrodes, the optimal composition of MmNi_4-xCo_0.7Mn_0.3Al_x is obtained when x=0.2.
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Effects of Al Content on Low-Temperature and High-Rate Performance of MmNi4.0-xCo0.7Mn0.3Alx Alloys

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通讯作者: 陈斌, bchen63@163.com

Effects of Al Content on Low-Temperature and High-Rate Performance of MmNi_4.0-xCo_0.7Mn_0.3Al_x Alloys