Unraveling the synergistic effects and mechanisms of nano-carbon modification on metal hydride alloys for enhanced electrochemical performance in energy storage applications

被引:4
作者
Li, Jinchi [1 ,3 ]
Yu, Shuqi [1 ,3 ]
Zhu, Ding [1 ,3 ]
Zhou, Wanhai [1 ,3 ]
He, Jian [1 ,3 ]
Zeng, Liang [1 ,3 ]
Chen, Shiqi [1 ,3 ]
Ma, Bihua [1 ,3 ]
Xi, Haonan [1 ,3 ]
Wu, Chaoling [2 ,3 ]
Cen, Wanglai [1 ,3 ]
Wang, Yao [1 ,3 ]
Chen, Yungui [1 ,3 ]
机构
[1] Sichuan Univ, Inst New Energy & Low Carbon Technol, Chengdu 610065, Peoples R China
[2] Sichuan Univ, Coll Mat Sci & Engn, Dept Adv Energy Mat, Chengdu 610065, Peoples R China
[3] Minist Educ, Engn Res Ctr Alternat Energy Mat & Devices, Chengdu 610065, Peoples R China
关键词
Metal hydride nickel battery; High rate discharge ability; Low-temperature electrochemical performance; Hydrogen storage alloy; N-doped nano carbon; SITU GROWN CO3O4; LOW-TEMPERATURE; CAPACITY DEGRADATION; HYDROGEN; BATTERIES; ELECTRODE; GRAPHENE; ELECTROCATALYSTS; COORDINATION; NANOSHEETS;
D O I
10.1016/j.cej.2023.145985
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The conflicting relationship between anti-corrosion ability and electrochemical kinetics significantly hinders the comprehensive performance of hydrogen storage alloys in nickel-metal hydride batteries. In this study, we successfully coated a nano carbon layer on the AB5-type hydrogen storage alloy to achieve exceptional peak power, high-rate discharge capability, low-temperature performance, and cycling stability simultaneously as the MH electrodes. The surface carbon layer could not only enhance the surface conductivity, but also result in a reduced state of the alloy to mitigate the oxidation of alloy owing to the electronic transfer from the carbon layer to metal. The carbon-coated alloy electrode thus exhibits superior electrochemical properties compared to the pure alloy electrodes. The discharge capacity of the carbon-coated electrode at a discharge current density of 4.5 A g-1 is 247.21 mAh/g, which is 2.37 times that of the master electrode (104.12 mAh/g). Additionally, the discharge capacity of the carbon-coated electrode at-40 degrees C reaches an impressive 250.85 mAh/g. More importantly, these carbon-coated alloy electrodes exhibit outstanding cycle performance. This technology offers a promising solution for high-power, low-temperature, and long-cycling Ni-MH batteries.
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页数:13
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