Porous 伪-MoO3/MWCNT Nanocomposite Synthesized via a Surfactant-Assisted Solvothermal Route as a Lithium-Ion-Battery High-Capacity Anode Material with Excellent Rate Capability and Cyclabili
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- 作者：Feng Ma ; Anbao Yuan ; Jiaqiang Xu ; Pengfei Hu
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2015
- 出版时间：July 22, 2015
- 年：2015
- 卷：7
- 期：28
- 页码：15531-15541
- 全文大小：805K
- ISSN：1944-8252
文摘
A high-performance 伪-MoO3/multiwalled carbon nanotube (MWCNT) nanocomposite material is synthesized via a novel surfactant-assisted solvothermal process followed by low-temperature calcination. Its structure, composition, and morphology are characterized by X-ray diffraction, X-ray photoelectron spectroscopy, energy-dispersive X-ray spectroscopy, carbon element analysis, nitrogen adsorption鈥揹esorption determination, scanning electron microscopy, and transmission electron microscopy techniques. Its electrochemical performance as a high-capacity lithium-ion-battery anode material is investigated by cyclic voltammetry, electrochemical impedance spectroscopy, and galvanostatic discharge/recharge methods. This composite material exhibits not only high capacity but also excellent rate capability and cyclability. For example, when the discharge/charge current density is increased from 0.1 to 2 A g鈥?, the reversible charge capacity is only decreased from 1138.3 to 941.4 mAh g鈥?, giving a capacity retention of 82.7%. Even if it is cycled at a high current density of 20 A g鈥?, a reversible charge capacity of 490.2 mAh g鈥? is still retained, showing a capacity retention of 43.1%. When it is repeatedly cycled at a current of 0.5 A g鈥?, the initial reversible charge capacity is 1041.1 mAh g鈥?. A maximum charge capacity of 1392.2 mAh g鈥? is achieved at the 292th cycle. After 300 cycles, a high charge capacity of 1350.3 mAh g鈥? is maintained. Enhancement of the electrical conduction contributed by the MWCNT composite component as well as the loose and porous texture of the MoO3/MWCNT composite is suggested to be responsible for the excellent performance.