ISSN : 1225-0112(Print)
ISSN : 2288-4505(Online)
ISSN : 2288-4505(Online)
Research Papers : The Electrochemical Properties of L4/3Ti5/3O4 Synthesized by Sol-Gel Process
Abstract
The superstructured Li4/3Ti5/3O4was 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 Li4/3Ti5/3O4was obtained by heat treatment of xerogel at 600℃ for 30 hrs. The synthesized Li4/3Ti5/3O4showed 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)/Li4/3Ti5/3O4at current density of 0.15 mA/cm2and the voltage range of 0.5∼3.0V.
연구논문 : 졸 - 겔법에 의해 합성된 Li4/3Ti5/3O4 의 전기화학적 특성
초록
초격자 구조의 Li4/3Ti5/3O4를 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, Li4/3Ti5/3O4는 xerogel을 600℃에서 30시간 동안 열처리하여 제조하였다. 그리고 합성된 Li4/3Ti5/3O4는 0.5∼3.0 V의 전위 영역에서 0.15 mA/cm2의 전류밀도로 Li/1M LiClO4(in PC)/Li4/3Ti5/3O4를 구성하여 실험한 결과 174 mAh/g의 초기 용량을 나타냈으며, 25 cycle 동안 27.3%의 용량 감소를 나타냈다.