리튬이차전지용 정극활물질 LiMn2O4의 안정화(II) -수용액계에서 치환형 LiMn2O4의 안정성-

이진식; 이철태

Journal of the Korean Industrial and Engineering Chemistry, Vol.10, No.6, 832-837, October, 1999

리튬이차전지용 정극활물질 LiMn₂O₄의 안정화(II) -수용액계에서 치환형 LiMn₂O₄의 안정성-

Stabilization of LiMn₂O₄ Electrode for Lithium Secondary Bttery (II) -Stability of Substituted LiMn₂O₄ in Aqueous System-

이진식, 이철태

초록

수용애계에서 정극활물질의 안정성을 1 M LiOH 용액에서 Tafel plot를 통해서 측정하였으며, 이 때 LiM_xMn_2-xO₄(x=0.05∼0.1) 전극은 100 mA에서 0.13∼0.15 mV의 과전압으로 LiMn₂O₄ 전극보다 0.05 mV가 낮은 과전압을 나타냈다. 또한 전위변화에 따른 전해질의 전도도는 LiM_xMn_2-xO₄가 스피넬 구조의 LiMn₂O₄보다 높고 나타났으며, Mn⁺²의 용액에 의한 용액저항은 상대적으로 낮게 나타났다.

Stability of a cathode material was determined by Tafel plot in 1 M LiOH solution. The stabilized LiM_xMn_2-xO₄ (x=0.05∼0.1) electrode resulted in overpotential of 0.13∼0.15 mV at 100 mA. This overpotential was 0.05 mV lower than that of the spinel structured LiMn₂O₄ electrode. Conductivity test at various potentials showed that the conductivity of LiM_xMn_2-xO₄ was higher than that of the spinel structured LiMn₂O₄ and the bulk resistance of LiM_xMn_2-xO₄ due to the dissolution of Mn²⁺ was lowered.

Keywords:tafel plot;overpotential;Mn²⁺ dissolution

[References]

Shu ZX, McMillan RS, Murray JJ, J. Electrochem. Soc., 140, 922 (1993)
Macklin WJ, Neat RJ, Powell RJ, J. Power Sources, 34, 39 (1991)
Lubin F, Lecerf A, Broussely M, Labat J, J. Power Sources, 34, 161 (1991)
Barboux P, Tarascon JM, Shokoohi FK, J. Solid State Chem., 94, 185 (1991)
Lee CT, Lee JS, Kim HJ, J. Korean Ind. Eng. Chem., 9(2), 220 (1998)
Lee JS, Lee CT, J. Korean Ind. Eng. Chem., 9(5), 774 (1998)
Kanzaki Y, Taniguchi A, Abe M, J. Electrochem. Soc., 138, 333 (1991)
Dudley JT, Wilkinson DP, Thomas G, Levae R, Woo S, Blom H, Horvath C, Jukow MW, Denis B, Juric P, Aghakian P, Dahn JR, J. Power Sources, 35, 59 (1991)

[1] Shu ZX, McMillan RS, Murray JJ, J. Electrochem. Soc., 140, 922 (1993)

[2] Macklin WJ, Neat RJ, Powell RJ, J. Power Sources, 34, 39 (1991)

[3] Lubin F, Lecerf A, Broussely M, Labat J, J. Power Sources, 34, 161 (1991)

[4] Barboux P, Tarascon JM, Shokoohi FK, J. Solid State Chem., 94, 185 (1991)

[5] Lee CT, Lee JS, Kim HJ, J. Korean Ind. Eng. Chem., 9(2), 220 (1998)

[6] Lee JS, Lee CT, J. Korean Ind. Eng. Chem., 9(5), 774 (1998)

[7] Kanzaki Y, Taniguchi A, Abe M, J. Electrochem. Soc., 138, 333 (1991)

[8] Dudley JT, Wilkinson DP, Thomas G, Levae R, Woo S, Blom H, Horvath C, Jukow MW, Denis B, Juric P, Aghakian P, Dahn JR, J. Power Sources, 35, 59 (1991)