Synthesis and lithium storage properties of vanadium oxide nanotubes (VOxNTs)-Polyaniline nanocomposite as cathode material for lithium ion batteries
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A novel VOxNTs-Polyaniline nanocomposite was prepared by hydrothermal treatment and a wet-chemistry method. When this VOxNTs-Polyaniline was used as cathode material for lithium ion batteries (LIBs), it displayed much higher specific capacity and better cycling stability compared with the pristine VOxNTs. The improvement of electrochemical performance could be attributed to the effective removal of a large part of organic template without any electrochemical activity by cationic exchange process and the incorporation of polyaniline with good conductivity as well as lithium storage property in itself via chemical oxidative polymerization. Moreover, the polyaniline could also behave as a useful structural buffer, alleviating the strain during repeated Li+ intercalation/deintercalation and contributing to cyclic stability. It is hopeful to further improve its performance through the complete elimination of useless soft-template and increasing the crystallinity of active VOx, making this novel VOxNTs-Polyaniline a promising cathode candidate with high performance for LIBs.
KeywordsPolyaniline Cathode Material LiFePO4 Vanadium Oxide Organic Template
It is appreciated for the financial support from the Youth Project of Applied basic research of Yunnan Science and Technology Department (Grant No. 2015FD001) and the Young/Middle-aged Backbone Teacher Cultivating Scheme of Yunnan University. This work is also funded in part by the National Natural Science Foundation of China (Grant Nos. 61366002, 61664009) and the High-end Scientific and Technological Talents Introduction Project of Yunnan Province (Grant No. 2013HA019).