Glucose‐Induced Synthesis of 1T‐MoS2/C Hybrid for High‐Rate Lithium‐Ion Batteries. Issue 14 (8th March 2019)

• Record Type: Journal Article
• Authors: Bai, Jin; Zhao, Bangchuan; Zhou, Jiafeng; Si, Jianguo; Fang, Zhitang; Li, Kunzhen; Ma, Hongyang; Dai, Jianming; Zhu, Xuebin; Sun, Yuping
• Is Part Of: Small. Volume 15:Issue 14(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-03-08
• Subjects: 1T‐MoS2/C hybrid -- glucose additive -- high rate performance -- lithium‐ion batteries -- nanosheets; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.201805420
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: 1T phase MoS2 possesses higher conductivity than the 2H phase, which is a key parameter of electrochemical performance for lithium ion batteries (LIBs). Herein, a 1T‐MoS2 /C hybrid is successfully synthesized through facile hydrothermal method with a proper glucose additive. The synthesized hybrid material is composed of smaller and fewer‐layer 1T‐MoS2 nanosheets covered by thin carbon layers with an enlarged interlayer spacing of 0.94 nm. When it is used as an anode material for LIBs, the enlarged interlayer spacing facilitates rapid intercalating and deintercalating of lithium ions and accommodates volume change during cycling. The high intrinsic conductivity of 1T‐MoS2 also contributes to a faster transfer of lithium ions and electrons. Moreover, much smaller and fewer‐layer nanosheets can shorten the diffusion path of lithium ions and accelerate reaction kinetics, leading to an improved electrochemical performance. It delivers a high initial capacity of 920.6 mAh g −1 at 1 A g −1 and the capacity can maintain 870 mAh g −1 even after 300 cycles, showing a superior cycling stability. The electrode presents a high rate performance as well with a reversible capacity of 600 mAh g −1 at 10 A g −1 . These results show that the 1T‐MoS2 /C hybrid shows potential for use in high‐performance lithium‐ion batteries. Abstract : 1T‐MoS2 nanosheets covered by thin carbon layers possess several advantages. Expanded interlayer spacing can effectively release volume variation, high electrical conductivity can accelerate fast transfer of lithium ions and electrons, and the much smaller and fewer‐layer nanosheet structure can shorten the diffusion path of the lithium ions. Benefitting from the synergistic effect of these advantages, a 1T‐MoS2 /C hybrid demonstrates excellent electrochemical performance.