Effect of amorphous carbon coating on low-purity natural graphite as an anode active material for lithium-ion batteries
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초록
Anode active materials that are low cost and have excellent capacity retention are suitable for large secondary battery systemssuch as energy saving systems (ESSs). In this study, inexpensive low-purity natural graphite was used as a matrix. This matrixwas coated with amorphous carbon to improve the cycle characteristics and inhibit dissolution of impurities. The naturalgraphite coated with amorphous carbon was prepared by the pyrolysis of sucrose during heat treatment. The shape and crystalstructure of the natural graphite powder were maintained even after a coating process that included heat treatment. Thethickness of the amorphous carbon layer measured by TEM was less 10 nm. After amorphous carbon coating, the coulombicefficiency during the first cycle decreased from 91.3 to 87.9%. On the other hand, the capacity retention rate during 50 cyclesincreased from 90.9 to 94.7%. Interestingly, impurities in the natural graphite such as Al, Fe, and Zn did not affect the stabilityof the electrolyte.
Abstract
Anode active materials that are low cost and have excellent capacity retention are suitable for large secondary battery systemssuch as energy saving systems (ESSs). In this study, inexpensive low-purity natural graphite was used as a matrix. This matrixwas coated with amorphous carbon to improve the cycle characteristics and inhibit dissolution of impurities. The naturalgraphite coated with amorphous carbon was prepared by the pyrolysis of sucrose during heat treatment. The shape and crystalstructure of the natural graphite powder were maintained even after a coating process that included heat treatment. Thethickness of the amorphous carbon layer measured by TEM was less 10 nm. After amorphous carbon coating, the coulombicefficiency during the first cycle decreased from 91.3 to 87.9%. On the other hand, the capacity retention rate during 50 cyclesincreased from 90.9 to 94.7%. Interestingly, impurities in the natural graphite such as Al, Fe, and Zn did not affect the stabilityof the electrolyte.
참고문헌 (22)
- J. Chen, , Materials, 6, pp.156~183 (2013)
- S. Goriparti, , Journal of Power Sources, 257, pp.421~443 (2014)
- Y.P. Wu, , Journal of Power Sources, 114, pp.228~236 (2003)
- Y. Sato, , Journal of Power Sources, 97-98, pp.165~170 (2001)
- T. Nakajima, , Journal of Power Sources, 168(1), pp.265~271 (2007)
- T. Takamura, , Journal of Power Sources, 81-82, pp.368~372 (1999)
- J. Drofenik, , Journal of Power Sources, 94(1), pp.97~101 (2001)
- M. Bele, , Carbon, 40(7), pp.1117~1122 (2002)
- H. Sun, , Electrochimica Acta, 52, pp.4312~4316 (2007)
- K. Y. Sheem, , Electrochimica Acta, 78, pp.223~228 (2012)
- E. Buiel, , Electrochimica Acta, 45, pp.121~130 (1999)
- M. Gaberscek, , Journal of Power Sources, 97-98, pp.67~69 (2001)
- L. Ji, , Carbon, 47, pp.3346~3354 (2009)
- 임영근, "Hard Carbon-coated Natural Graphite Electrodes for High-Energy and Power Lithium-Ion Capacitors", Bulletin of the Korean Chemical Society, 36(1), pp.150~155 (2015), 대한화학회[DOI]
- M. Yoshio, , Journal of Materials Chemistry, 14, pp.1754~1758 (2004)
- H.A. Wilhelm, , Carbon, 45, pp.2356~2364 (2007)
- H. Huang, , Solid State Ionics, 110, pp.173~178 (1998)
- J. Qing, , Carbon, 116, pp.456~469 (2017)
- X.Y. Chuan, , International Nano Letters, 3, pp.6~ (2013)
- A. Sadezky, , Carbon, 43, pp.1731~1742 (2005)
- H.L. Zhang, , Carbon, 44, pp.2212~2218 (2006)
- H. Wang, , Journal of the Electrochemical Society, 149, pp.A499~A503 (2002)