졸-겔법에 의한 Li4/3Mn5/3O4 의 합성 및 전기화학적 특성

이진식; 이철태

Journal of the Korean Industrial and Engineering Chemistry, Vol.10, No.1, 80-84, February, 1999

Export Citation

졸-겔법에 의한 Li_4/3Mn_5/3O₄ 의 합성 및 전기화학적 특성

Synthesis of Li_4/3Mn_5/3O₄ by Sol-Gel Process and its Electrochemical Properties

이진식, 이철태

초록

출발 물질로 lithium acetate와 manganese acetate를 이용하여 졸겔법으로 결함 스피넬 구조인 Li_4/3Mn_5/3O₄를 합성하였으며, 리튬이차전지용 전극물질로 이용하기 위한 전극 특성을 조사하였다. AA/Mn(OAc)₂의 몰비를 0.2, H₂O/Mn(OAc)₂에 대한 NH₄OH/Mn(OAc)₂의 혼합 몰비를 0.4로 혼합하여 xerogel을 합성하고 이를 산소 분위기하에서 150℃에서 12시간 동안 1차 열처리한 다음 350℃에서 12시간 동안 2차 열처리하여 합성하였다. 2.0∼3.2V의 전위 영역에서 충·방전 실험한 결과 Li/Li_4/3Mn_5/3O₄ cell은 84.23 mAh/g의 방전용량을 나타내었으며, 좋은 cycleability을 나타내었다.

Li_4/3Mn_5/3O₄ having a defect structure was prepared by sol-gel process using lithium acetate and manganese acetate as starting materials, and their electrode characteristics in the lithium secondary battery was investigated. The reaction mole ratio was determined as AA/Mn(OAc)₂ of 0.2 and NH₄OH/Mn(OAc)₂ to H₂O/Mn(OAc)₂ of 0.4. The product was obtained through heat treatment at 350℃ for 12hrs after 1'st heat treatment at 150℃ of xerogel under oxygen atmosphere. When the charge and discharge cycles were performed between 2.0 V and 3.2 V, Li/Li_4/3Mn_5/3O₄ cell showed the dicharge capacity of 84.23 mAh/g and the good cycleability was obtained in the plateau region.

Keywords:Sol-gel Process;Li_4/3Mn_5/3O₄;Lithium Secondary Battery

[References]

Thackeray MM, de Kock A, Rossouw MH, Liles D, J. Electrochem. Soc., 139, 363 (1992)
Gummow RJ, Dekock A, Thackeray MM, Solid State Ion., 69(1), 59 (1994)
Yamada A, Miura K, Hinokuma K, Tanaka M, J. Electrochem. Soc., 142(7), 2149 (1995)
Tarascon JM, Mckinnon WR, Coowar F, Bowmer TN, Amatucci G, Guyomard D, J. Electrochem. Soc., 141(6), 1421 (1994)
Endres P, Fuchs B, Kemmlersack S, Brandt K, Faustbecker G, Praas HW, Solid State Ion., 89(3-4), 221 (1996)
Takada T, Akiba E, J. Solid State Chem., 130, 74 (1997)
Gao Y, Richard MN, Dahn JR, J. Appl. Phys., 80, 4141 (1996)
Gao Y, Dahn JR, J. Electrochem. Soc., 143(6), 1783 (1996)
Nyquist RA, Kagel RO, "Infrared Spectra of Inorganic Compounds," Academic Press, New York (1995)
Thackeray MM, Mansuetto MF, Dees DW, Vissers DR, Mater. Res. Bull., 31(2), 133 (1996)

[1] Thackeray MM, de Kock A, Rossouw MH, Liles D, J. Electrochem. Soc., 139, 363 (1992)

[2] Gummow RJ, Dekock A, Thackeray MM, Solid State Ion., 69(1), 59 (1994)

[3] Yamada A, Miura K, Hinokuma K, Tanaka M, J. Electrochem. Soc., 142(7), 2149 (1995)

[4] Tarascon JM, Mckinnon WR, Coowar F, Bowmer TN, Amatucci G, Guyomard D, J. Electrochem. Soc., 141(6), 1421 (1994)

[5] Endres P, Fuchs B, Kemmlersack S, Brandt K, Faustbecker G, Praas HW, Solid State Ion., 89(3-4), 221 (1996)

[6] Takada T, Akiba E, J. Solid State Chem., 130, 74 (1997)

[7] Gao Y, Richard MN, Dahn JR, J. Appl. Phys., 80, 4141 (1996)

[8] Gao Y, Dahn JR, J. Electrochem. Soc., 143(6), 1783 (1996)

[9] Nyquist RA, Kagel RO, "Infrared Spectra of Inorganic Compounds," Academic Press, New York (1995)

[10] Thackeray MM, Mansuetto MF, Dees DW, Vissers DR, Mater. Res. Bull., 31(2), 133 (1996)