Pomegranate-like MoC@C composites as stable anode materials for lithium-ion batteries

作者:Qi, J (Qi, Jun)^[1 ]; Shi, ZP (Shi, Zhangping)^[2,3 ]; Li, X (Li, Xiang)^[1 ]; Gao, BX (Gao, Boxu)^[2 ]; Wang, H (Wang, Hui)^[1 ]; Yang, LC (Yang, Lichun)^[1 ]; Tang, Y (Tang, Yi)^[2 ]; Zhu, M (Zhu, Min)^[1 ]

Transition metal carbides serving as anode materials for lithium-ion batteries attract increasing attention owing to their high capacity and excellent conductivity. In this article, pomegranate-like granules assembled by carbon coated molybdenum carbide nanocrystallites (MoC@C) are fabricated through facile carburization of metal-organic framework precursor of trimesic acid Molybdenum (Mo-3(BTC)(2)). The pomegranate-like structure not only offers short diffusion paths for Li+, but also relieves the volume variations during the Li+ insertion/extraction process. The size of MoC nanocrystallites and the content of carbon coating can be optimized by adjusting the carburization temperature. The optimal MoC@C-700 sample exhibits superior cycle stability and high-rate performance. At 200 mA g(-1), it shows reversible capacity of 647.3 mAh g(-1). Even when the current density increases to 1 A g(-1), it still delivers 570.6 mAh g(-1) in the first cycle and maintains 509.8 mAh g(-1) after 500 cycles. The high capacity and stable cycling performance indicate the pomegranate-like MoC@C composites may be promising for high-performance lithium-ion batteries anode. (C) 2019 Published by Elsevier B.V.

作者关键词:Transition metal carbide; Lithium-ion battery; Anode material; Carbon coating; Pomegranate-like structure

KeyWords Plus:HYDROGEN EVOLUTION; LIFE ANODES; CARBON; PERFORMANCE; CARBIDE; STORAGE; NANOPARTICLES; MICROSPHERES; TRANSITION; NANOSHEETS

通讯作者地址:Yang, LC (通讯作者)

South China Univ Technol, Sch Mat Sci & Engn, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510641, Guangdong, Peoples R China.   增强组织信息的名称     South China University of Technology

Fudan Univ, Lab Adv Mat & Collaborat Innovat Ctr Chem Energy, Dept Chem, Shanghai Key Lab Mol Catalysis & Innovat Mat, Shanghai 200433, Peoples R China.   增强组织信息的名称     Fudan University

地址:

	[ 1 ] South China Univ Technol, Sch Mat Sci & Engn, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510641, Guangdong, Peoples R China   增强组织信息的名称     South China University of Technology
	[ 2 ] Fudan Univ, Lab Adv Mat & Collaborat Innovat Ctr Chem Energy, Dept Chem, Shanghai Key Lab Mol Catalysis & Innovat Mat, Shanghai 200433, Peoples R China   增强组织信息的名称     Fudan University
	[ 3 ] Shanghai Res Inst Petrochem Technol, State Key Lab Green Chem Engn & Ind Catalysis SIN, Shanghai 201208, Peoples R China

电子邮件地址:mslcyang@scut.edu.cn; yitang@fudan.edu.cn

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