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Li(Ni, Co, Mn)$O_2$ has been known as one of the most promising cathode materials for lithium secondary batteries. However, it has some problems to overcome for commercialization such as inferior rate capability and unstable thermal stability. In order to address these problems, surface modification of cathode materials by coating has been investigated. In the coating techniques, selection of coating material is a key factor of obtaining enhanced properties of cathode materials. In this work, we introduced solid electrolyte (Li-La-Ti-O) as a coating material on the surface of $Li[Ni_{0.3}Co_{0.4}Mn_{0.3}]O_2$ cathode. Specially, we focused on a rate performance of Li-La-Ti-O coated $Li[Ni_{0.3}Co_{0.4}Mn_{0.3}]O_2$ cathode. Both bare and Li-La-Ti-O 2 wt.% coated sample showed similar discharge capacity at 0.5C rate. However, as the increase of charge-discharge rate to 3C, the coated samples displayed better discharge capacity and cyclic performance than those of bare sample.

참고문헌 (15)

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  3. Y. J. Park, "High rate performance of $Li[Co_{0.5}Li_{0.17}Mn_{0.33}]O_{2}$ cathode", J. of KIEEME (in Korean), Vol. 19, No. 8, p. 737, 2006. 
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  5. H. B. Kim, B. C. Park, S. T. Myung, K. Amine, J. Prakash, and Y. K. Sun, "Electrochemical and thermal characterization of $AlF_{3}$-coated $Li[Ni_{0.8}Co_{0.15}Al_{0.55}]O_{2}$ cathode in lithium-ion cells", J. Power Sources, Vol. 179, p. 347, 2008. 
  6. S. H. Lee, B. K. Koo, J. C. Kim, and K. M. Kim, "Effect of $Co_{3}(PO_{4})_{2}$ coating on $Li[Co_{0.1}Ni_{0.15}Li_{0.2}Mn_{0.55}]O_{2}$ cathode material for lithium rechargeable batteries", J. Power Sources, Vol. 184, p. 276, 2008. 
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  12. A. D. Robertson and P. G. Bruce, “Mechanism of electrochemical activity in $Li_{2}MnO_{3}$”, Chem. Mater., Vol. 15, p. 1984, 2003. 
  13. S. T. Myung, K. Izumi, S. Komaba, H. Yashiro, H. J. Bang, Y. K. Sun, and Naoaki Kumagai, "Funtionality of oxide coating for $Li[Co_{0.05}Ni_{0.4}Co_{0.15}Mn_{0.4}]O_{2}$" as positive electrode materials for litium-ion secondary batteries", J. Phys. Chem., Vol. 111, p. 4061, 2007. 
  14. J. Choi and A. Manthiram, "Role of chemical and structural stabilties on the electrochemical properties of layered $LiNi_{1/3}Mn_{1/3}Co_{1/3}O_{2}$ cathodes", J. Electrochemical Society, Vol. 152, p. A1714, 2005. 
  15. J. H. Ryu, S. B. Kim, and Y. J. Park, "Ag doping effect on $Li[Ni_{0.2}Li_{0.2}Mn_{0.6}]O_{2}$ cathode material", J. of KIEEME(in Korean), Vol. 21, No. 3, p. 249, 2008. 

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