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In Situ Constructing MoS 2 ‐C Nanospheres as Advanced Anode for Sodium‐Ion Battery
Author(s) -
Liu Lihuai,
Shi Rongjia,
Li Yanjuan,
Wu Yufen,
Ye Kun,
Yan Xiao,
Shi Yanhui,
Cao Changsheng
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201802331
Subject(s) - anode , materials science , gravimetric analysis , electrochemistry , chemical engineering , electrolyte , sodium ion battery , battery (electricity) , nanocomposite , carbon fibers , sodium , nanoparticle , raman spectroscopy , electrode , nanotechnology , composite material , chemistry , composite number , metallurgy , organic chemistry , power (physics) , physics , faraday efficiency , engineering , quantum mechanics , optics
Striving for achievements of anode materials with excellent rate capability and long cycle life is a key to the commercial progress of sodium‐ion batteries. In the present work, we report a spherical MoS 2 ‐C nanocomposite as anode for sodium‐ion batteries (SIBs) with high‐performance. The active materials were prepared via an in situ solvothermal reaction, in which carbon and MoS 2 were simultaneously formed in one pot using toluene, acetone and ethanol as solvents. SEM results show that the controlled morphology has relative to the solvents, and the thermal gravimetric (TG) and Raman spectrum results indicated that the carbon was in situ formed. The MoS 2 ‐C nano‐spheres were applied for sodium ion batteries. The results illustrate that MoS 2 ‐C harvested from ethanol demonstrates the best electrochemical performances with long cycling stability (430 mA h g −1 after 100th cycles at 0.2 A g −1 ) and high rate capability (248 mA h g −1 at 5 A g −1 ). The superior properties of MoS 2 ‐C nanocoposite benefits from several merits: (1) nanoscale size can short path of Na + diffusion, enlarge electrode/electrolyte contact area, (2) sphere structure possesses good stress–strain relief during Na + insertion/extraction reactions and consequently decreases huge volume variation, (3) the carbon in situ formed between MoS 2 particles can improve the intrinsically poor electronic conductivity leading to higher rate capability. The novel MoS 2 ‐C architectures provide a new avenue to fabricate carbon coupled with sulfides materials with excellent performances.