Mesoporous Mo2C/N-doped carbon heteronanowires as high-rate and long-life anode materials for Li-ion batteries

标题

Mesoporous Mo2C/N-doped carbon heteronanowires as high-rate and long-life anode materials for Li-ion batteries

作者

作者:Yang, LC (Yang, Lichun)^[1 ]; Li, X (Li, Xiang)^[1 ]; He, S (He, Sina)^[2 ]; Du, GH (Du, Gaohui)^[3 ]; Yu, X (Yu, Xiang)^[2 ]; Liu, JW (Liu, Jiangwen)^[1 ]; Gao, QS (Gao, Qingsheng)^[2 ]; Hu, RZ (Hu, Renzong)^[1 ]; Zhu, M (Zhu, Min)^[1 ]

期刊信息

摘要

Transition metal carbides are an emerging class of anode materials for Li-ion batteries (LIBs), which have recently drawn attention because of their good conductivity and high capacity after rational nanoengineering. In this work, we have developed Mo2C/N-doped carbon mesoporous heteronanowires (Mo2C/N-C MHNWs) with enhanced capacitive behaviour as high-performance anode materials for LIBs. With the heterostructure, the Mo2C nanocrystallites offer short paths for Li+ diffusion, while the N-doped carbon matrix facilitates fast electron transportation and buffers the volume change of Mo2C during the discharge/charge cycles. When evaluated as anodes for LIBs, the Mo2C/N-C MHNWs exhibited high capacity and high rate capability, as well as a long-term cycle life. In particular, a reversible capacity of 744.6 mA h g(-1) was achieved in the first cycle, and 732.9 mA h g(-1) was preserved after 700 cycles at a current density of 2 A g(-1). The outstanding performance stems from fast kinetics enhanced by the pseudocapacitive effect, which was evidenced in the further analysis based on electrochemical impedance spectra and cyclic voltammetry. Our results elucidate the attractive Li+ storage performance of Mo2C-based nanocomposites, which may shed some light on the development of high-performance materials for energy storage and utilization.

关键词

KeyWords Plus:ELECTROCHEMICAL ENERGY-STORAGE; N-DOPED CARBON; RECHARGEABLE LITHIUM BATTERIES; HIGH-PERFORMANCE; MICROWAVE-ABSORPTION; MOLYBDENUM CARBIDE; INTERCALATION; CAPACITY; MXENE; NANOCOMPOSITES

作者信息

作者信息

通讯作者地址:Zhu, M (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

通讯作者地址:Gao, QS (通讯作者)

Jinan Univ, Dept Chem, Guangzhou 510632, Guangdong, Peoples R China.   增强组织信息的名称     Jinan 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 ] Jinan Univ, Dept Chem, Guangzhou 510632, Guangdong, Peoples R China   增强组织信息的名称     Jinan University
	[ 3 ] Zhejiang Normal Univ, Inst Phys Chem, Jinhua 321004, Peoples R China   增强组织信息的名称     Zhejiang Normal University

电子邮件地址:tqsgao@jnu.edu.cn; memzhu@scut.edu.cn

出版商

ROYAL SOC CHEMISTRY, THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND

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