Premium
An Advanced MoS 2 /Carbon Anode for High‐Performance Sodium‐Ion Batteries
Author(s) -
Wang Jingjing,
Luo Chao,
Gao Tao,
Langrock Alex,
Mignerey Alice C.,
Wang Chunsheng
Publication year - 2015
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201401521
Subject(s) - anode , faraday efficiency , electrolyte , materials science , molybdenum disulfide , electrochemistry , fourier transform infrared spectroscopy , chemical engineering , sodium ion battery , polarization (electrochemistry) , electrode , chemistry , metallurgy , engineering
Molybdenum disulfide (MoS 2 ) is a promising anode for high performance sodium‐ion batteries due to high specific capacity, abundance, and low cost. However, poor cycling stability, low rate capability and unclear electrochemical reaction mechanism are the main challenges for MoS 2 anode in Na‐ion batteries. In this study, molybdenum disulfide/carbon (MoS 2 /C) nanospheres are fabricated and used for Na‐ion battery anodes. MoS 2 /C nanospheres deliver a reversible capacity of 520 mAh g −1 at 0.1 C and maintain at 400 mAh g −1 for 300 cycles at a high current density of 1 C, demonstrating the best cycling performance of MoS 2 for Na‐ion batteries to date. The high capacity is attributed to the short ion and electron diffusion pathway, which enables fast charge transfer and low concentration polarization. The stable cycling performance and high coulombic efficiency (∼100%) of MoS 2 /C nanospheres are ascribed to (1) highly reversible conversion reaction of MoS 2 during sodiation/desodiation as evidenced by ex‐situ X‐ray diffraction (XRD) and (2) the formation of a stable solid electrolyte interface (SEI) layer in fluoroethylene carbonate (FEC) based electrolyte as demonstrated by fourier transform infrared spectroscopy (FTIR) measurements.