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Improved Electrochemical Performance of Ultrathin MoS 2 Nanosheet/Co Composites for Lithium‐Ion Battery Anodes
Author(s) -
Bai Jin,
Zhao Bangchuan,
Zhou Jiafeng,
Fang Zhitang,
Li Kunzhen,
Ma Hongyang,
Dai Jianming,
Zhu Xuebin,
Sun Yuping
Publication year - 2019
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201801891
Subject(s) - nanosheet , anode , materials science , electrochemistry , composite number , lithium (medication) , chemical engineering , nanotechnology , cobalt , lithium ion battery , battery (electricity) , electrode , composite material , metallurgy , chemistry , medicine , power (physics) , physics , quantum mechanics , endocrinology , engineering
Ultrathin MoS 2 nanosheets are promising anode materials for high energy‐density Li‐ion batteries. However, their practical applications suffer from problems of lower capacity and poor cycling performance. In this work, the electrochemical performance of ultrathin MoS 2 nanosheets is improved by the synergistic effect of the MoS 2 nanosheet structure and cobalt compositing. The morphological characteristics show that the MoS 2 /Co composite has a more dispersed ultrathin nanosheet structure with a more uniform size distribution. When it is used as an anode material for lithium‐ion batteries, the MoS 2 /Co composite exhibits excellent lithium storage performance compared with the MoS 2 . It delivers a much higher initial discharge specific capacity of 1130 mAh g −1 at 100 mA g −1 and still retains 766 mAh g −1 even at 2 A g −1 , exhibiting an excellent rate capability. Besides, it also shows a good cycling performance with a slowly capacity increase to 1340 mAh g −1 after 50 cycles at 100 mA g −1 . The MoS 2 /Co composite structure enhances the conductivity of ultrathin MoS 2 nanosheets, shortens diffusion path of Li + , and accelerates Li + and electron transfer, improving the corresponding electrochemical performance.