Porous hollow composites assembled by NixCo1-xSe2 nanosheets rooted on carbon polyhedra for superior lithium storage capability

作者:Xu, HB (Xu, Hongbin)^[1 ]; Wu, RB (Wu, Renbing)^[1,2 ]

Transition metal chalcogenides (TMCs) have attracted considerable interest owing to their satisfied theoretical capacity, good safety and environmentally benign nature in lithium-ion batteries (LIBs). However, the poor conductivity as well as the severe volume changes during the discharge-charge process cause capacity fading rapidly, which severely impede the practical applications of TMCs. To address this challenge, a hollow hybrid architecture assembled by NixCo1-xSe2 nanosheets and strongly coupled porous carbon have been rational designed. Within this structure, the integration of nanosheets rooted on the surface of porous carbon not only provide three-dimensional conductive network but also offer plentiful pathways and active sites for electrolyte penetration and Li storage, and buffer a large volume expansion/contraction caused by lithium intercalation/deintercalation. As evidenced by electrochemical measurements, the NixCo1-xSe2/C composites used as anodes in LIBs exhibit a superior reversible high capacity of 1667 mA h g(-1) at current density of 2.0 A g(-1) over 600 cycles and an outstanding rate capability (1580 and 1093 mA h g(-1) at 3.2 and 6.4 A g(-1), respectively). (C) 2018 Elsevier Inc. All rights reserved.

作者关键词:NixCo1-xSe2/C; Composites; Hollow; Anodes; Lithium-ion batteries

KeyWords Plus:METAL-ORGANIC FRAMEWORK; IN-SITU FORMATION; ELECTROCHEMICAL PROPERTIES; ION BATTERIES; FACILE SYNTHESIS; ENERGY-STORAGE; ANODE MATERIAL; GRAPHENE FOAM; EFFICIENT; PERFORMANCE

通讯作者地址:Wu, RB (通讯作者)

Fudan Univ, Dept Mat Sci, Shanghai 200433, Peoples R China.   增强组织信息的名称     Fudan University

地址:

	[ 1 ] Fudan Univ, Dept Mat, Shanghai 200433, Peoples R China   增强组织信息的名称     Fudan University
	[ 2 ] South China Univ Technol, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510640, Guangdong, Peoples R China   增强组织信息的名称     South China University of Technology

电子邮件地址:rbwu@fudan.edu.cn

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