文献类型：期刊文献

英文题名：Construction of nanoporous Mo2C shell/MoO3 core composite by converting MoO3 and its superior performance in lithium sulfur battery

作者：Zhao, Chongjun[1]; Xu, Sijia[1]; Zhang, Xu[1]; Wang, Yixuan[1]; Rui, Pengfei[1]; Zheng, Jiexin[1]; Zhao, Chunhua[1]

机构：[1] Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, China

年份：2022

卷号：922

外文期刊名：Journal of Electroanalytical Chemistry

收录：EI(收录号：20223912784784)

语种：英文

外文关键词：Carbonization - Decay (organic) - Lithium batteries - Lithium compounds - Polysulfides - Separators - Sulfur compounds

摘要：The lithium-sulfur (Li-S) battery is a promising energy storage device in the future. However, its performance is strongly affected by the shuttle effect and inherent sluggish kinetics. Herein, Mo2C/MoO3-modified separator is constructed, in which MoO3 particles are derived by the decomposition of Mo source and simultaneously their surfaces are converted (reduced and carbonized) into Mo2C, i.e., Mo2C shell/MoO3 core. In addition, the resin matrix of the waste CFRP (Carbon fiber reinforced polymer) acts as the carbon source for the change from MoO3 to Mo2C, while CF is claimed from CFRP. The synergistic effect of conductive Mo2C-shell and polar MoO3-core anchors lithium polysulfide to promote the conversion of sulfur. Benefited from block effect on the soluble lithium polysulfide (LiPS) and catalytic effect on sulfur, Li-S battery with Mo2C/MoO3-modified separator owns excellent electrochemical performance: A high initial discharge specific capacity of 1288 mAh g?1 at 0.2C and an initial capacity of 670 mAh g?1 at 4C, as well as the average decay rate per cycle of 0.039% over 250 times. ? 2022 Elsevier B.V.