文献类型：期刊文献

英文题名：Hollow-shell structured porous CoSe2 microspheres encapsulated by MXene nanosheets for advanced lithium storage

作者：Hong, Lin[1,2];Ju, Shunlong[2];Yang, Yunhe[1];Zheng, Jiening[2];Xia, Guanglin[2];Huang, Zhenguo[3];Liu, Xiaoyun[1];Yu, Xuebin[2]

机构：[1]East China Univ Sci & Technol, Minist Educ, Key Lab Specially Funct Polymer Mat & Related Tec, Shanghai 200237, Peoples R China;[2]Fudan Univ, Dept Mat Sci, Shanghai 200433, Peoples R China;[3]Univ Technol Sydney, Sch Civil & Environm Engn, Ultimo, NSW 2007, Australia

年份：2020

卷号：4

期号：5

起止页码：2352

外文期刊名：SUSTAINABLE ENERGY & FUELS

收录：;EI(收录号：20202008663708);WOS:【SCI-EXPANDED(收录号:WOS:000534220100022)】；

基金：This work was partially supported by the National Key Research and Development Program of China (2017YFA0204600), the National Natural Science Foundation of China (51971065, 51773060, and 51625102), the Innovation Program of Shanghai Municipal Education Commission (2019-01-07-00-07-E00028), the Fundamental Research Funds for the Central Universities (50321041917001), and the Science and Technology Commission of Shanghai Municipality (17XD1400700), the International Collaboration Research Program of Science and Technology Commission of Shanghai (16520722000) and Shanghai Natural Science Foundation (16ZR1407700). Zhenguo Huang is grateful for the financial support from ARC (DP170101773).

语种：英文

外文关键词：Anodes - Lithium-ion batteries - Transition metals - Chemical stability - Porous materials - Selenium compounds

摘要：Cobalt diselenide (CoSe2), a representative transition-metal chalcogenide (TMC), is attracting intensive interest as an anode material for lithium ion batteries (LIBs), in view of its high specific capacity based on the conversion reaction mechanism. However, the huge volume variation and low intrinsic electrical conductivity during the charge/discharge process lead to inferior rate performance and short cycle life of the CoSe2 electrode, which severely hinder its practical application. Herein, novel hollow-shell structured porous CoSe2 microspheres are constructed by selenization of Co-MOFs based on the Kirkendall effect. Furthermore, CoSe2@MXene robust structures, comprised of inner hollow CoSe2 microspheres and an outer MXene flake coating, are fabricated by a facile electrostatic self-assembly method. The as-obtained CoSe2@MXene hybrids possess the combined advantages of the high capacity of CoSe2 hollow spheres and high conductivity of MXene flakes. More importantly, strong chemical interactions (Co-O-Ti covalent bonds) between CoSe2 and oxygen functionalized Ti3C2 MXene are formed at the interface, which could boost the electron/ion transport kinetics and enhance the structural durability of CoSe2@MXene hybrids, resulting in the improvement of rate performance and cycling stability. Consequently, as anode materials for LIBs, the CoSe2@MXene hybrids deliver an admirable reversible capacity of 1051 mA h g(-1) at 200 mA g(-1), a superior rate capability of 465 mA h g(-1) at 5 A g(-1), and excellent long-term cycling properties at 1 A g(-1) with a capacity of 1279 mA h g(-1) after 1000 cycles. The hollow-shell structured porous materials coated by the MXene strategy provide an effective route for designing new anode materials with excellent electrochemical properties.