首页|Efficient Ni2V2O7 catalyst for high-performance Li-S batteries
Efficient Ni2V2O7 catalyst for high-performance Li-S batteries
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Although Li-S batteries have a high theoretical capacity,their application are significantly hindered by the com-plex shuttle effect of polysulfides.To address the issues,in this paper,Ni2V2O7 prepared by a simple method is proposed as an efficient catalyst for S cathodes.Ni2V2O7 composed of Ni-O octahedra and V-O tetrahedra has a specific electronic structure.The Ni and V atoms interacted,enabling a fast kinetics of polysulfide redox.Moreover,Ni2V2O7 contains metal sites(Ni and V)and oxygen vacancies,providing a high adsorption capacity and abundant active sites for polysulfide redox.Therefore,Li-S batteries consisting of Ni2V2O7-based cathodes exhibit an excellent cycling stability with a capacity of 1061 mAh g-1 and capacity retention of 87.6％after 150 cycles at 0.2 C.Moreover,at 1 C rate,the batteries exhibit a capacity of 706 mAh g-1 after 300 cycles with a minimal capacity decay of only 0.08％per cycle.
Ni2V2O7Li-S batteriesCatalystAdsorption
Hengxue Zhou、Jialiang Wang、Yeba Yan、Yue Fang、Yi Long、Bo Liang、Yingbang Yao、Shengguo Lu、Tao Tao
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School of Materials and Energy,Guangdong University of Technology,Guangzhou 510006,China
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