졸-겔법에 의해 합성된 Li4/3Ti5/3O4의 전기화학적 특성

이진식; 이철태

Journal of the Korean Industrial and Engineering Chemistry, Vol.10, No.1, 73-79, February, 1999

Export Citation

졸-겔법에 의해 합성된 Li_4/3Ti_5/3O₄의 전기화학적 특성

The Electrochemical Properties of Li_4/3Ti_5/3O₄ Synthesized by Sol-Gel Process

이진식, 이철태

초록

초격자 구조의 Li_4/3Ti_{5/3O₄를 lithium acetate (LA)와 titanium n-butoxide (TNB)의 혼합 용액을 이용한 졸겔법으로 합성하였다. 이때 얻어진 겔상은 TNB/LA 몰비 5/4에 AA/TNB의 몰비 0.125를 혼합한 clear sol 용액에 NH₄OH/TNB 몰비 0.35와 H₂O/TNH 몰비 3.5를 첨가하여 얻었으며, Li_4/3Ti_5/3O₄는 xerogel을 600℃에서 30시간 동안 열처리하여 제조하였다. 그리고 합성된 Li_4/3Ti_5/3O₄는 0.5∼3.0 V의 전위 영역에서 0.15 mA/cm²의 전류밀도로 Li/1M LiClO₄(in PC)/Li_4/3Ti_5/3O₄를 구성하여 실험한 결과 174 mAh/g의 초기 용량을 나타냈으며, 25 cycle 동안 27.3%의 용량 감소를 나타냈다.}

The superstructured Li_4/3Ti_5/3O₄ was prepared by sol-gel process using a mixed solution of lithium acetate (LA) and titanium n-butoxide (TNB). The gel phase was obtained by adding ammonia water (NH₄OH/TNB mole ratio of 0.35) and water (H₂O/TNH mole ratio of 3.5) into the clear sol that was prepared after mixing TNB/LA mole ratio of 5/4 with AA/TNB mole raio of 0.125. It was found that the most suitable Li_4/3Ti_5/3O₄ was obtained by heat treatment of xerogel at 600℃ for 30 hrs. The synthesized Li_4/3Ti_5/3O₄ showed an initial discharge capacity of 174 mAh/g and the capacity loss of about 27.3% during 25 cycles in Li/1M LiClO₄(in PC)/Li_4/3Ti_5/3O₄ at current density of 0.15 mA/cm² and the voltage range of 0.5∼3.0V.

Keywords:Xerogel;Li_4/3Ti_5/3O₄;Cathode Material

[References]

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[1] Faul I, Knight J, Chem. Ind., Dec., 18 (1989)

[2] Ruetschi P, J. Power Sources, 42, 1 (1993)

[3] Miura K, Yamada A, Tanaka M, Electrochim. Acta, 41(2), 249 (1996)

[4] Terasaki M, Yoshda H, Tukamoto H, Mizutani M, Yamachi M, J. Electrochem. Soc. Jpn., 12, 1471 (1993)

[5] Ohzuku T, Ueda A, Yamamoto N, J. Electrochem. Soc., 142(5), 1431 (1995)

[6] Ozuku T, Ueda A, Nagayama M, J. Electrochem. Soc., 140, 1862 (1993)

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

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

[9] Johnston DC, Prakash H, Zachariasen WH, Viswanathan R, Mater. Res. Bull., 8, 777 (1973)

[10] Nyquist RA, Kagel RO, "Infrared Spectra of Inorganic Compounds," pp. 99, Academic Press, New York (1995)