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리튬2차전지용 LiCoO2/LiNi1/3Mn1/3Co1/3O2계 복합정극의 전기화학적 특성 연구

A Study on Electrochemical Characteristics of LiCoO2/LiNi1/3Mn1/3Co1/3O2 Mixed Cathode for Li Secondary Battery

  • 김현수 (한국전기연구원 전지연구그룹) ;
  • 김성일 (한국전기연구원 전지연구그룹) ;
  • 엄승욱 (한국전기연구원 전지연구그룹) ;
  • 김우성 (대정화금(주) 중앙연구소)
  • 발행 : 2006.01.01

초록

In this study, the $LiCoO_2/LiNi_{1/3}Mn_{1/3}Co_{1/3}O_2$ mixed cathode electrodes were prepared and their electrochemical performances were measured in a high cut-off voltage. As the content of $LiNi_{1/3}Mn_{1/3}Co_{1/3}O_2$ increased in a mixed cathode, the reversible specific capacity and cycleability of the electrode enhanced, but the rate capability was deteriorated. On the contrary the rate capability of the cathode enhanced, but the reversible specific capacity and cycleability were deteriorated, increasing the content of $LiCoO_2$ in the mixed cathode. The cell of $LiCoO_2/LiNi_{1/3}Mn_{1/3}Co_{1/3}O_2$ ($50:50 wt\%$) mixed cathode delivered a discharge capacity of ca. 168 mAh/g at a 0.2 C rate. The capacity of the cell decreased with the current rate and a useful capacity of ca. 152 mAh/g was obtained at a 2.0 C rate. However, the cell showed very stable cycleability: the discharge capacity of the cell after 20th charge/discharge cycling maintains ca. 163 mAh/g.

키워드

참고문헌

  1. 김현수, 신정한, 나성환, 엄승욱, 문성인, 김상필, 'PMMA IPN계 겔폴리머전해질을 채용한 리튬이온폴리머전지의 전기화학적 특성', 전기전자재료학회논문지, 16권, 11호, p. 994, 2003
  2. 김현수, 김성일, 최관영, 문성인, 김상필, '리튬이온전지용 Urethane계 겔폴리머전해질에 관한 연구', 전기전자재료학회논문지, 15권, 12호, p. 1033, 2002
  3. 김종욱, 문성인, 진봉수, 구할본, 윤문수, '이온전도성 Poly(ethylene oxide) 고분자전해질의 전도특성', 전기전자재료학회지, 8권, 4호, p. 412, 1995
  4. M. M. Thackeray, 'Structural considerations of layered and spinel lithiated oxides for lithium ion batteries', J. Electrochem. Soc., Vol. 142, No.8, p. 2558, 1995
  5. M. N. Obrovac, O. Mao, and J. R. Dahn, 'Structure and electrochemistry of $LiMO_{2}$ (M =Ti, Mn, Fe, Co, Ni) prepared by mechanochemical synthesis', Solid State Ionics, Vol. 112, No. 1-2, p. 9, 1998 https://doi.org/10.1016/S0167-2738(98)00228-8
  6. M. K. Mizushima, P. C. Jones, P. J. Wiseman, and J. B. Goodenough, 'A new cathode material for batteries of high energy density', Mater. Res. Bull., Vol. 15, No.6, p. 783, 1980
  7. M. N. Obrovac, O. Mao, and J. R. Dahn, 'Structure and electrochemistry of $LiMO_{2}$ (M=Ti, Mn, Fe, Co, Ni) prepared by mechanochemical synthesis', Solid State Ionics, Vol. 112, No. 1-2, p. 9, 1998 https://doi.org/10.1016/S0167-2738(98)00228-8
  8. K. Mizushima, P. C. Jones, P. J. Wiseman, and J. B. Goodenough, '$LixCoO_{2}$ (O https://doi.org/10.1016/0025-5408(80)90012-4
  9. K. Brandt, 'Practical batteries based on the SWING system', J. Power Sources, Vol. 54, No.1, p. 151, 1995
  10. T. Ohzuku, A. Ueda, and M. Nagayama, 'Electrochemistry and structural chemistry of $LiNiO_{2}$ (R3m) for 4 volt secondary lithium cells', J. Electrochem. Soc., Vol. 140, No.7, p. 1862, 1993
  11. Y. Jang, N. Dudney, D. A. Blom, and L. F. Allard, 'High-voltage cycling behavior of thin-film $LiCoO_{2}$ cathodes', J. Electrochem. Soc., Vol. 149, No. 11, p. A1442, 2002 https://doi.org/10.1149/1.1511751
  12. G. G. Amatucci, J. M. Tarascon, and L. C. Klein, 'Cobalt dissolution in $LiCoO_{2}$-based non-aqueous rechargeable batteries', Solid State Ionics, Vol. 83, No. 1-2, p. 167, 1996 https://doi.org/10.1016/0167-2738(95)00229-4
  13. J. Cho, J. Lee, B. Kim, T. Kim, J. Kim, and B. Kim, 'Control of AlPO4-nanoparticle coating on $LiCoO_{2}$ by using water or ethanol', Electrochim. Acta, Vol. 50, p. 4182, 2005 https://doi.org/10.1016/j.electacta.2005.01.039
  14. H. Wang, Y-I. Jang, B. Huang, D. R. Sadowa, and Y. -M. Chiang, 'Factors that affect cycle-life and possible degradation mechanism of a Li-ion cell based $LiCoO_{2}$', J. Electrochem. Soc., Vol. 146, p. 473, 1999 https://doi.org/10.1149/1.1391631
  15. S. Myung, M. Lee, S. Komaba, N. Kumagai, and Y. Sun, 'Hydrothermal synthesis of layered Li$[Ni_{1/3}Co_{1/3}Mn_{1/3}]O_{2}$ as positive electrode material for lithium secondary battery', Electrochim. Acta, Vol. 50, p, 4800, 2005 https://doi.org/10.1016/j.electacta.2005.02.034
  16. J. Choi and A. Manthiram, 'Role of chemical and structural stabilities on the electrochemical properties of layered $LiNi_{1/3}Mn_{1/3}Co_{1/3}O_{2}$cathodes', J. Electrochem. Soc., Vol. 152, No.9, p. A1714, 2005 https://doi.org/10.1149/1.1954927
  17. Y. Kim, K. Kim, and D. Moon, 'Characteristics of layered $LiNi_{1/2}Mn_{1/2}O_{2}$synthesized by PV A -assisted sol-gel and molten-salt method for lithium secondary battery', Appl. Chem., Vol. 7, No.2, p. 651, 2003