摘要
The rational synthesis of transition metal sulfides with long cycle life and good rate performance is essential for building superior electrochemical energy storage devices. In this work, the MnS nanoparticles/N,S-codoping carbon nanotubes (MnS@N,S-C NTs) with double-layer carbon have been synthesized through a facile in situ transformation method. The synergetic coupling effects benefited from the advantages of double N,S-C layers, and porous structures are effective to allow fast electrons/lithium ions transport and keep good structural integrity during the charging/discharging process. Owing to the large surface area, the MnS@N,S-C NTs electrode is mainly pseudocapacitive in nature during the charge-discharge process, which is beneficial to enhance the electrochemical transfer kinetics. When used as anodes for lithium ion batteries, the MnS@N,S-C NTs exhibit a high specific capacity of 796 mAh g(-1) during the 200th cycle at 1.0 A g(-1). Even at 10.0 A g(-1), the discharge specific capacity of the MnS@N,S-C NTs can still reach about 400 mAh g(-1) during the 9000th cycle with superior rate capability. The proposed approach may promote rational creation of other hybrid functional materials for energy storage and conversion.
- 出版日期2018-9
- 单位广东工业大学