Porous V2O5-SnO2/CNTs composites as high performance cathode materials for lithium-ion batteries

能源化学(英文) ›› 2013, Vol. 22 ›› Issue (2): 347-355.

• Articles • 上一篇

Porous V₂O₅-SnO₂/CNTs composites as high performance cathode materials for lithium-ion batteries

Qi Guo, Zhenhua Sun, Man Gao, Zhi Tan, Bingsen Zhang, Dang Sheng Su

Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Liaoning, China

收稿日期:2012-12-13 修回日期:2013-01-29 出版日期:2013-03-20 发布日期:2013-04-04
通讯作者: Zhenhua Sun, Dang Sheng Su
基金资助:
This work was supported by the National Natural Science Foundation of China (No. 51001098) and the Institute of Metal Research of CAS (No. 09NBA211A1).

Porous V₂O₅-SnO₂/CNTs composites as high performance cathode materials for lithium-ion batteries

Qi Guo, Zhenhua Sun, Man Gao, Zhi Tan, Bingsen Zhang, Dang Sheng Su

Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Liaoning, China

Received:2012-12-13 Revised:2013-01-29 Online:2013-03-20 Published:2013-04-04
Supported by:
This work was supported by the National Natural Science Foundation of China (No. 51001098) and the Institute of Metal Research of CAS (No. 09NBA211A1).

摘要/Abstract

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穏^-1 at the voltage range of 2.05-4.0 V, measured at a current rate of 200 mA穏^-1, while that of the commercial V₂O₅ was only 88 mAh穏^-1, demonstrating that the porous V₂O₅-SnO₂/CNTs composite is a promising candidate for high-performance lithium secondary batteries.

关键词: lithium-ion battery, cathode, vanadium oxide, carbon nanotube, electrochemical energy storage

Abstract: 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穏^-1 at the voltage range of 2.05-4.0 V, measured at a current rate of 200 mA穏^-1, while that of the commercial V₂O₅ was only 88 mAh穏^-1, demonstrating that the porous V₂O₅-SnO₂/CNTs composite is a promising candidate for high-performance lithium secondary batteries.

Key words: lithium-ion battery, cathode, vanadium oxide, carbon nanotube, electrochemical energy storage

Qi Guo, Zhenhua Sun, Man Gao, Zhi Tan, Bingsen Zhang, Dang Sheng Su. Porous V₂O₅-SnO₂/CNTs composites as high performance cathode materials for lithium-ion batteries[J]. 能源化学(英文), 2013, 22(2): 347-355.

Qi Guo, Zhenhua Sun, Man Gao, Zhi Tan, Bingsen Zhang, Dang Sheng Su. Porous V₂O₅-SnO₂/CNTs composites as high performance cathode materials for lithium-ion batteries[J]. Journal of Energy Chemistry, 2013, 22(2): 347-355.

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Porous V₂O₅-SnO₂/CNTs composites as high performance cathode materials for lithium-ion batteries

Porous V₂O₅-SnO₂/CNTs composites as high performance cathode materials for lithium-ion batteries

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