침전법으로 제조된 전구체 성질에 의한 LiCoO2의 특성에 관한 연구

정명국; 황치석; 최청송; Myoung Kuk Jeong; Chi Seok Hwang; Cheong Song Choi

Clean Technology, Vol.12, No.2, 101-106, June, 2006

Characterization of LiCoO2 Synthesized via Structural and Compositional Variations of Precursors Prepared by Precipitation

정명국, 황치석, 최청송 ^†

서강대학교 화공생명공학부, 121-742 서울시 마포구 신수동 1번지

Myoung Kuk Jeong, Chi Seok Hwang, and Cheong Song Choi^†

Department of Chemical and Biomolecular Engineering, Sogang University, 1 Sinsoo-dong, Mapo-gu, Seoul 121-742, Korea

E-mail:

초록

본 연구에서는 수산화물 전구체로부터 HT-LiCoO2 분말을 제조하였다. 사용된 Co(OH)2는 α상 및, 또는 β상의 수산화물이며 여러 조건에서 침전법으로 제조되었다. 제조시에 [OH-]/[Co2+] 농도 비와 숙성시간을 조절함으로써 원하는 특성을 지닌 Co(OH)2 제조가 가능하였다. 침전법으로 합성한 Co(OH)2와 LiOH를 메탄올 수용액을 이용하여 혼합한 후 이어서 증발, 건조 그리고 숙성 조작에 의하여 HT-LiCoO2의 전구체를 합성하였다. 숙성기간에 tailor-made β-phase Co(OH)2는 CoOOH로 변환되면서 고용체를 형성한다. 이 같은 결과로 HT-LiCoO2가 낮은 온도(600℃), 짧은 시간(10분)에 합성이 가능하게 된다.

HT-LiCoO2 powders were synthesized from hydroxide precursors in this study. The cobalt hydroxide compounds with hydrotalcite-like(α-phase) and/or brucite-like(β-phase) structures as a component of the precursor were prepared in various PH conditions using precipitation method. It was found that various phase and compositions of cobalt hydroxides could be tailor-prepared via a careful control of preparation parameters such as the concentration ratio of [OH-]/[Co2+] and aging time. The hydroxides Co(OH)2 and LiOH were mixed with aqueous methyl-alcohol. The precursor of a HT-LiCoO2 was synthesized via subsequent processes including evaporation, drying and aging. The transformation of tailor-made β-phase Co(OH)2 to CoOOH and formation of solid solution in the precursor were achieved during aging. These results cause HT-LiCoO2 to be synthesized at low temperature(600℃) for a short time(10min).

Keywords:Cathode material;Precipitation;Precursor;LiCoO2

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[Related Articles]

[1] Nishi Y, J. Power Sources, 100(1-2), 101 (2001)

[2] Kang SG, Kang SY, Ryu KS, Chang SH, Solid State Ion., 120(1-4), 155 (1999)

[3] Kamath PV, Vasanthacharya NY, J. Appl. Electrochem., 22, 483 (1992)

[4] Faure C, Delmas C, Fouassier M, J. Power Sources, 35, 279 (1991)

[5] Bish DL, Livingstone A, J. Solid State Inorg. Chem., 31, 823 (1994)

[6] Xu ZP, Zeng HC, Int. J. Inorg. Mater, 2, 187 (2000)

[7] Fernandez-Rodriguez JM, Morales J, Tilado JL, Reactivity of Solids, 4, 163 (1987)

[8] Jeong WT, Lee KS, J. Alloys. Compounds, 322, 205 (2001)

[9] Kosova NV, Anufrienko VF, Larina TV, Rougier A, Aymard L, Tarascon JM, J. Solid State Chem., 165, 56 (2002)

[10] Kamath PV, Therese GHA, J. Solid State Chem., 128, 38 (1997)

[11] Ramesh TN, Rajamathi M, Kamath PV, Solid State Ion., 5, 751 (2003)

[12] Rajamathi M, Kamath PV, Seshadri R, Mater. Res. Bull., 35(2), 271 (2000)

[13] Jayashree RS, Kamath PV, J. Mater. Chem., 9, 961 (1999)

[14] Pralong V, Delahaye-Vidal A, Beaudoin B,Gerand B, Tarascon JM, J. Mater. Chem., 9, 955 (1999)

[15] Chiang YM, Jang YI, Wang HF, Huang BY, Sadoway DR, Ye PX, J. Electrochem. Soc., 145(3), 887 (1998)

[16] Rao KJ, Benqlilou-Moudden H, Desbat B, J. Solid State Chem., 165, 42 (2002)

[17] Choi YM, Pyun SI, Bae JS, Moon SI, J. Power Sources, 56, 25 (1995)