High Performance of Nano-sized LiFePO4 Positive Electrode Using etched Al Current Collector
2
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
The electrodes comprising nano-sized LiFePO4, carbon black and binder are prepared with two different Al current collectors. One is the generally used normal Al foil and the other is the chemically etched Al foil. Surface characteristics of each Al foil and electrochemical performance of the cathodes using each foil are investigated. The electrode from the etched Al foil exhibits better physical and electrochemical properties as compared to those of the normal Al foil because the etched Al foil has rough surface with sub-micron pores which improve the adhesion between the electrode materials and the substrate. The electrode on the etched Al foil has such a strong peel strength that the impedance is smaller than that of normal one. Indeed the LiFePO4 electrode from the etched Al foil exhibits a better rate capability and remains intact even after storage for 1 week at the charged state at the elevated temperature 60˚C.
Abstract
The electrodes comprising nano-sized LiFePO4, carbon black and binder are prepared with two different Al current collectors. One is the generally used normal Al foil and the other is the chemically etched Al foil. Surface characteristics of each Al foil and electrochemical performance of the cathodes using each foil are investigated. The electrode from the etched Al foil exhibits better physical and electrochemical properties as compared to those of the normal Al foil because the etched Al foil has rough surface with sub-micron pores which improve the adhesion between the electrode materials and the substrate. The electrode on the etched Al foil has such a strong peel strength that the impedance is smaller than that of normal one. Indeed the LiFePO4 electrode from the etched Al foil exhibits a better rate capability and remains intact even after storage for 1 week at the charged state at the elevated temperature 60˚C.
참고문헌 (15)
- A. K. Padhi, "Phospho-olivines as positive-electrode materials for rechargeable lithium batteries", J. Electrochem. Soc., 144, pp.1188~ (1997)
- A. Yamaha, "Optimized LiFePO4 for lithium battery cathodes", J. Electrochem. Soc., 148, pp.224~ (2001)
- V. Srinivasan, "Discharge model for the lithium iron-phosphate electrode", J. Electrochem. Soc., 151, pp.1517~ (2004)
- S. -Y. Chung, "Electronically conductive phospho-olivines as lithium storage electrodes", Nat. Mat., 1, pp.123~ (2002)
- H. Huang, "Approaching theoretical capacity of LiFePO4 at room temperature at high rates", Electrochem. Solid-State Lett., 4, pp.170~ (2001)
- D. Choi, "Surfactant based sol-gel approach to nanostructured LiFePO₄ for high rate Li-ion batteries", J. Power Sources, 163, pp.1064~ (2007)
- N. Ravet, "Electroactivity of natural and synthetic triphylite", J. Power Sources, 97, pp.503~ (2001)
- C. R. Sides, "A high-rate, nanocomposite LifePO₄", Carbon cathode, 2005, pp.8, 484~
- Y. Lin, "Effects of carbon coating and iron phosphides on the electrochemical properties of LiFePO₄", C, 2008, pp.184, 444~
- P. S. Herle, "Nanonetwork electronic conduction in iron and nickel olivine phosphates", Nat. Mat., 3, pp.147~ (2004)
- K. Striebel, "The development of low cost LiFePO₄-based high power lithium-ion batteries", J. Power Sources, 146, pp.33~ (2005)
- M. Yao, "LiFePO₄-based electrode using micro-porous current collector for high power lithium ion battery", J. Power Sources, 173, pp.545~ (2007)
- Battery test manual for plug-in hybrid electric vehicles, "Idaho National Laboratory", Idaho National Laboratory, 3~42, pp.INL (2008), EXT-07-12536
- A. Eftekhari, "Aluminum oxide as a multi-function agent for improving battery performance of LiMn₂O₄ cathode", Solid State Ionics, 167, pp.237~ (2004)
- J. -H. Lee, "Effect of poly(acrylic acid) on adhesion strength and electrochemical performance of natural graphite negative electrode for lithium-ion batteries", Journal of Power Sources, 161, pp.612~ (2006), 신에너지[DOI]