이성분계 전도성물질을 이용한 리튬이온전지의 전기화학적 성능 향상에 관한 연구

이창우; 이미숙; 김현수; 문성인; Chang Woo Lee; Mi Sook Lee; Hyun Soo Kim; Seong In Moon

Journal of the Korean Industrial and Engineering Chemistry, Vol.16, No.5, 689-692, October, 2005

Export Citation

이성분계 전도성물질을 이용한 리튬이온전지의 전기화학적 성능 향상에 관한 연구

Improvement on Electrochemical Performances of Lithium-Ion Batteries Using Binary Conductive Agents

이창우^†, 이미숙, 김현수, 문성인

한국전기연구원 재료응용연구단 전지연구그룹

Chang Woo Lee^†, Mi Sook Lee, Hyun Soo Kim, and Seong In Moon

Battery Research Group, Korea Electrotechnology Research Institute (KERI), Seongju-Dong, Chang Won 641-120, Korea

E-mail:

초록

스피넬계 LiMn2O4를 양극 활물질로 사용하는 리튬이온전지의 전기화학적 성능을 향상시키기 위하여 서로 상이한 입자크기를 가지는 Super P Black 및 Vulcan® XC-72R을 사용한 이성분계 전도성물질을 제조하였다. 이렇게 이성분계 전도성물질을 사용하여 제조되어진 LiMn2O4 전지 시스템은 충ㆍ방전 동안의 비용량 및 사이클 수명의 관점에서 특성 평가되었다. 결과적으로 Super P Black 및 Vulcan® XC-72R이 3:7의 비율로 구성되어진 이성분계 전도성물질을 사용하였을 때의 전지가 우수한 전기화학적 성능을 보여주었으며 이는 적절한 조합의 ionic diffusion rate와 electric contact에 의해 제어되어졌기 때문인 것으로 여겨진다.

In order to improve the electrochemical performances of Li-ion batteries when spinel LiMn2O4 is employed as a cathode active material, binary conductive agents were prepared using two different particle-sized carbons like Super P Black and Vulcan® XC-72R. The electrochemical performances of the LiMn2O4 cell system using binary conductive agents were evaluated in terms of specific charge and discharge capacities and cycle life. The cell with binary conductive agent in the 3:7 weight ratios of Super P Black and Vulcan® XC-72R showed better electrochemical performances due to the proper combination of ionic diffusion rate and electric contact.

Keywords:binary conductive agent;spinel LiMn2O4;Li-ion batteries;A.C. impedance

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[1] Appetecchi GB, Scrosati B, Electrochim. Acta, 43(9), 1105 (1998)

[2] Abraham KM, Pasquariello DM, Willstaedt EM, J. Electrochem. Soc., 145(2), 482 (1998)

[3] Ohzuku T, Ueda A, J. Electrochem. Soc., 141(11), 2972 (1994)

[4] Sun X, Lee HS, Yang XQ, McBreen J, Electrochem. Solid State Lett., 4, A184 (2001)

[5] Kannan AM, Manthiram A, Electrochem. Solid State Lett., 5, A167 (2002)

[6] Yamane H, Saitoh M, Sano M, Fujita M, Sakata M, Takada M, Nishibori E, Tanaka N, J. Electrochem. Soc., 149(12), A1514 (2002)

[7] Cheon SE, Kwon CW, Kim DB, Hong SJ, Kim HT, Kim SW, Electrochim. Acta, 46(4), 599 (2000)

[8] Hong JK, Lee JH, Oh SM, J. Power Sources, 111(1), 90 (2002)

[9] Kinoshita K, Carbon: Electrochemical and Physical Properties, Chap. 7, Wiley, NY (1998)

[10] Lahaye J, Wtterwald MJ, Messit J, J. Appl. Electrochem., 14, 117 (1984)

[11] Kadowaki M, Inoki M, Toyokazu T, Oishi A, Proceedings of the 42nd Battery Symposium, 1A01, Japan, 86 (2001)

[12] Fan J, Fedkiw PS, J. Power Sources, 72(2), 165 (1998)

[13] Park SC, Han YS, Kang YS, Lee PS, Ahn S, Lee HM, Lee JY, J. Electrochem. Soc., 148(7), A680 (2001)