Rational Design of NiCoO2@SnO2 Heterostructure Attached on Amorphous Carbon Nanotubes with Improved Lithium Storage Properties

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• 作者：Xin Xu ; Sheng Chen ; Chunhui Xiao ; Kai Xi ; Chaowei Guo ; Shengwu Guo ; Shujiang Ding ; Demei Yu ; R. Vasant Kumar
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：March 9, 2016
• 年：2016
• 卷：8
• 期：9
• 页码：6004-6010
• 全文大小：490K
• ISSN：1944-8252

文摘

It still remains very challenging to design proper heterostructures to enhance the electrochemical performance of transition metal oxide-based anode materials for lithium-ion batteries. Here, we synthesized the NiCoO₂ nanosheets@SnO₂ layer heterostructure supported by amorphous carbon nanotubes (ACNTs) which is derived from polymeric nanotubes (PNTs) by a stepwise method. The inner SnO₂ layer not only provides a considerable capacity contribution but also produces the extra Li₂O to promote the charge process of NiCoO₂ and thus results in a rising cycling performance. Combining with the contribution of ACNTs backbone and ultrathin NiCoO₂ nanosheets, the specific capacities of these one-dimensional nanostructures show an interesting gradually increasing trend even after 100 cycles at 400 mA g^–1 with a final result of 1166 mAh g^–1. This approach can be an efficient general strategy for the preparation of mixed-metal-oxide one-dimensional nanostructures and this innovative design of hybrid electrode materials provides a promising approach for batteries with improved electrochemical performance.