이차전지용 탄소재의 흑연화 분위기에 따른 표면미세구조와 전지성능에 미치는 영향

허윤; 이정용; 윤상영; Yoon Huh; Jeong-Yong Lee; Sang-Young Yoon

Korean Journal of Materials Research, Vol.10, No.11, 743-748, November, 2000

The Surface Micro-structures with the Atmospheres in Graphitizing the Carboneous Materials for Rechargeable Batteries and Their Effects on the Cell Performances

허윤, 이정용, 윤상영¹

한국과학기술원 재료공학과
¹(주)삼성SDI 기술본부 에너지 Lab.

Yoon Huh, Jeong-Yong Lee, and Sang-Young Yoon¹

Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Taejeon 305-701, Korea
¹Energy Lab. Corperate R&D Center, Samsung SDI CO., Ltd., Chonan 330-300, Korea

초록

리튬이온이차전지의 부극재로 사용되는 탄소재인 비정질 탄소(needle cokes)에 B 2 O 3 를 첨가하여 공기중의 질소 분위기와 Ar 분위기에서 고온으로 흑연화 열처리를 하였을 때의 표면미세구조의 변화와 제 2상의 분포를 투과전자현미경으로 분석하였다. 또한 전지용량, 전지효율과 같은 전지성능이 탄소재의 표면미세구조와 관련되어 있음을 고찰하였다.

Amorphous carbons(neddle cokes), which are used as anode materials for lithium ion secondary batteries, were graphitized or heat-treated at high temperature in N 2 atmosphere and in Ar atmosphere, after adding B 2 O 3 . After then, using transmission eletron microscopy, their surface micro-structures and the formations and distributions of the second phases were analyzed. It was studied that such analyzed results were related to the cell capacities and efficiencies.

Keywords:Graphitizaton;Lithium ion secondary batteries;Surface micro-strutures;Hexagonal born nitride;Cell performances

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[1] Abraham KM, Electrochim. Acta., 38(9), 1233 (1993)

[2] Brummer SB, Abraham KM, Koch VR, Holleck GL, Final Report, Contract 4503510/ Lawrence Berkeley Lab. by EIC Lab. Inc., 1980 (1980)

[3] Scrosati B, J. Electrochem. Soc., 139, 2776 (1992)

[4] JSPS, 학술진흥회법/ JSPS, 1963 (1963)

[5] JP3-144547/ Sharp

[6] Sogabe T, Matsuda T, Kuroda K, Hirohata Y, Hino T, Yamashina T, Carbon, 33, 1783 (1995)

[7] Sogabe T, Nakajima K, Inagaki M, J. Mater. Sci., 31(24), 6469 (1996)

[8] Sogabe T, Okada O, Kuroda K, Inagaki M, Carbon, 35, 67 (1997)

[9] Lowell CE, J. Am. Ceram. Soc., 50, 142 (1967)

[10] Jones LE, Thrower PA, Carbon, 28, 239 (1990)

[11] Willianm C, Thomas EP, Cariva O, Garlo GP, Carbon, 33, 367 (1995)

[12] Hagio T, Nakamizo M, Kobayashi K, Carbon, 27, 259 (1989)

[13] Yata S, Synthetic Met., 38, 185 (1990)

[14] Dahn JR, Zheng T, Liu YH, Xue JS, Science, 270(5236), 590 (1995)

[15] Liu Y, Carbon, 34, 193 (1996)

[16] Wilson AM, Dahn JR, J. Electrochem. Soc., 142(2), 326 (1995)

[17] 윤상영, 류재율, 심규윤, 김상진, 최완욱, 한국재료학회춘계발표회 (1998)

[18] 일본학술진흥회117위원회 (日本學術振興會117委員會)Tanso(炭素)/ v.36, no.25, pp.1063

[19] Massalski TB, Subramanian PR, Okamoto H, Kacprzak L, Binary Alloy Phase Diagrams(2nd ed.)/ APDIC

[20] Robie RA, Waldbaum DR, Thermodynamic Properties of Minerals and Related Substances at 298.15K and One Atmosphere Pressure and at Higher Temperatures/ U. S. Government Printing Office, 1968 (1968)

[21] Dahn JR, et al., Phys. Rev. B, 45, 3773 (1992)