Porous V_2O_5-SnO_2 /CNTs composites as high performance cathode materials for lithium-ion batteries

查看全文 作　　者：Qi [1]Guo;Zhenhua [1]Sun;Man [1]Gao;Zhi [1]Tan;Bingsen [1]Zhang;Dang Sheng [1]Su

机构地区：[1]Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences

出　　处：《Journal of Energy Chemistry》索引2013年第22卷第2期,共9页

基　　金：supported by the National Natural Science Foundation of China (No. 51001098);the Institute of Metal Research of CAS (No. 09NBA211A1) 摘　　要：Vanadium pentoxide (V2O5 ) exhibits high theoretical capacities when used as a cathode in lithium ion batteries (LIBs), but its application is limited by its structural instability as well as its low lithium and electronic conductivities. A porous composite of V2O5 -SnO2 /carbon nanotubes (CNTs) was prepared by a hydrothermal method and followed by thermal treatment. The small particles of V2O5 , their porous structure and the coexistence of SnO2 and CNTs can all facilitate the diffusion rates of the electrons and lithium ions. Electrochemical impedance spectra indicated higher ionic and electric conductivities, as compared to commercial V2O5 . The V2O5 -SnO2 /CNTs composite gave a reversible discharge capacity of 198 mAh g-1 at the voltage range of 2.05 4.0 V, measured at a current rate of 200 mA g-1 , while that of the commercial V2O5 was only 88 mAh g-1 , demonstrating that the porous V2O5 -SnO2 /CNTs composite is a promising candidate for high-performance lithium secondary batteries. 关键词：锂离子电池复合材料多孔结构正极材料性能电子电导率结构不稳定性碳纳米管

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Porous V_2O_5-SnO_2 /CNTs composites as high performance cathode materials for lithium-ion batteries

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