High-Rate Charge/Discharge Properties of Li Ion Secondary Battery Using V₂O₅/Carbon Composite Electrodes with Carbon Fiber

Abstract:

The charge/discharge properties of V2O5/carbon composites with controlled microstructures were investigated to achieve a high-rate lithium electrode performance. Composite electrodes were synthesized by mixing a V2O5 sol, carbon and a surfactant, followed by drying. V2O5/AB (acetylene black) and V2O5/VGCF (vapor-grown carbon fiber) composite electrodes showed high-rate charge/discharge properties only when they had very high carbon contents. V2O5/ (AB and VGCF) composite electrodes with controlled microstructures exhibited a discharge capacity of 245 mA·h·g-1 at a high current density of 40 A·g-1, which was approximately 70% of that at a low current density of 100 mA·g-1. The improvement in the high-rate charge/discharge properties was attributed to the short lithium ion diffusion distance, large reaction area and high electronic conductivity of those composite electrodes.

• Periodical: Key Engineering Materials (Volume 301)
• Pages: 159-162
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.301.159
• Online since: January 2006
• Authors: Akira Kuwahara, Shinya Suzuki, Masaru Miyayama
• Keywords: Carbon Fiber (CF), High Rate Charge Property, High Rate Discharge Property, Lithium Intercalation, Lithium Rechargeable Battery, V₂O₅

References

[1] J. Livage, Chem. Mater., 3 (1991), p.578.

[2] F. Coustier, J. M. Lee, S. Passerini, W. H. Smyrl, Solid State Ionics, 116 (1999), p.279.

[3] J. Desilvestro, O. Haas, J. Electrochem. Soc., 137 (1990), p. 5C.

[4] T. Kudo, Y. Ikeda, T. Watanabe, M. Hibino, M. Miyayama, H. Abe, K. Kajita, Solid State Ionics, 152-153 (2002), p.833.

[5] M. Ugaji, M. Hibino, T. Kudo, J. Electrochem. Soc., 142 (1995), p.3664.

[6] S. Suzuki, M. Hibino, M. Miyayama, J. Power Sources, 124 (2003).