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We demonstrate a direct growth of carbon nanotubes (CNTs) on the surface of LiFePO4 (LFP) powders for use in lithium-ion batteries (LIB). LFP has been widely used as a cathode material due to its low cost and high stability. However, there is a still enough room for development to overcome its low energy density and electrical conductivity.
In this study, we fabricated novel structured composites of LFP and CNTs (LFP-CNTs) and characterized the electrochemical properties of LIB. The composites were prepared by direct growth of CNTs on the surface of LFP using a rotary chemical vapor deposition. The growth temperature and rotation speed of the chamber were optimized at 600 ℃ and 5 rpm, respectively. For the LIB cell fabrication, a half-cell was fabricated using polytetrafluoroethylene (PTFE) and carbon black as binder and conductive additives, respectively. The electrochemical properties of LIBs using commercial carbon-coated LFP (LFP/C), LFP with CNTs grown for 10 (LFP/CNTs-10m) and 30 min(LFP/CNTs-30m) are comparatively investigated. For example, after the formation cycle, we obtained 149.3, 160.1, and 175.0 ㎃h/g for LFP/C, LFP/CNTs-10m, and LFP/CNTs-30m, respectively. In addition, the improved rate performance and 111.9 ㎃h/g capacity at 2C rate were achieved from the LFP/CNTs-30m sample compared to the LFP/CNTs-10m and LFP/C samples. We believe that the approach using direct growth of CNTs on LFP particles provides straightforward solution to improve the conductivity in the LFPbased electrode by constructing conduction pathways.
In this study, we fabricated novel structured composites of LFP and CNTs (LFP-CNTs) and characterized the electrochemical properties of LIB. The composites were prepared by direct growth of CNTs on the surface of LFP using a rotary chemical vapor deposition. The growth temperature and rotation speed of the chamber were optimized at 600 ℃ and 5 rpm, respectively. For the LIB cell fabrication, a half-cell was fabricated using polytetrafluoroethylene (PTFE) and carbon black as binder and conductive additives, respectively. The electrochemical properties of LIBs using commercial carbon-coated LFP (LFP/C), LFP with CNTs grown for 10 (LFP/CNTs-10m) and 30 min(LFP/CNTs-30m) are comparatively investigated. For example, after the formation cycle, we obtained 149.3, 160.1, and 175.0 ㎃h/g for LFP/C, LFP/CNTs-10m, and LFP/CNTs-30m, respectively. In addition, the improved rate performance and 111.9 ㎃h/g capacity at 2C rate were achieved from the LFP/CNTs-30m sample compared to the LFP/CNTs-10m and LFP/C samples. We believe that the approach using direct growth of CNTs on LFP particles provides straightforward solution to improve the conductivity in the LFPbased electrode by constructing conduction pathways.
목차
Abstract
1. 서론
2. 실험 방법
3. 결과 및 고찰
4. 결론
References
참고문헌 (26)
참고문헌 신청
J.B. Goodenough, Y. Kim, Challenges for rechargeable Li batteries, Chemistry of Materials, 22 (2010) 587-603.
J. Xu, H.R. Thomas, R.W. Francis, K.R. Lum, J. Wang, B. Liang, A review of processes and technologies for the recycling of lithium-ion secondary batteries, Journal of Power Sources, 177 (2008) 512-527.
M. Wentker, M. Greenwood, J. Leker, A bottom-up approach to lithium-ion battery cost modeling with a focus on cathode active materials, Energies, 12 (2019) 504.
S.P. Chen, D. Lv, J. Chen, Y.H. Zhang, F.N. Shi, Review on defects and modification methods of LiFePO4 cathode material for lithium-ion batteries, Energy & Fuels, 36 (2022) 1232-1251.
X. Zhou, F. Wang, Y. Zhu, Z. Liu, Graphene modified LiFePO4 cathode materials for high power lithium ion batteries, Journal of Materials Chemistry, 21 (2011) 3353-3358.
J. Xu, H.R. Thomas, R.W. Francis, K.R. Lum, J. Wang, B. Liang, A review of processes and technologies for the recycling of lithium-ion secondary batteries, Journal of Power Sources, 177 (2008) 512-527.
M. Wentker, M. Greenwood, J. Leker, A bottom-up approach to lithium-ion battery cost modeling with a focus on cathode active materials, Energies, 12 (2019) 504.
S.P. Chen, D. Lv, J. Chen, Y.H. Zhang, F.N. Shi, Review on defects and modification methods of LiFePO4 cathode material for lithium-ion batteries, Energy & Fuels, 36 (2022) 1232-1251.
X. Zhou, F. Wang, Y. Zhu, Z. Liu, Graphene modified LiFePO4 cathode materials for high power lithium ion batteries, Journal of Materials Chemistry, 21 (2011) 3353-3358.
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