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제114회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Synergistic effects of Li4Ti5O12 and Co3O4 for enhanced capacities in lithium ion batteries

등록일
2014년 8월 28일 16시 07분 43초
접수번호
1192
발표코드
ELEC.P-1240 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
10월 15일 (수요일) 16:00~19:00
발표형식
포스터
발표분야
전기화학
저자 및
공동저자
홍정의, 오례경, 류광선*
울산대학교 화학과, Korea

Spinel Li4Ti5O12 (LTO) material has an excellent reversibility of Li-ion intercalation and de-intercalation and exhibits zero strain volume change during charge and discharge cycles with an excellent safety performance. However, unfortunately LTO has a low electrical conductivity and also a theoretical capacity of 175 mAh g-1, which is lower than that of conversion-based anode materials such as Si or Sn. This disadvantage restricts its applications in high-power storage devices. In this work, we attempted to overcome the low theoretical capacity of LTO and the irreversible and poor cycling performance of metal oxides by synthesizing the LTO/Co3O4 composites. Composites comprised of LTO/Co3O4 were synthesized by solution combustion and solution precipitation methods. The diffraction patterns of LTO, Co3O4, and LTO/Co3O4 composite could be indexed as the cubic spinel structure corresponding to LTO with the Fd-3m space group and absence of any impurity-phase peaks. The surface and pores of LTO were covered with the Co3O4 particles. The Co3O4 particles existed in the composite are agglomerated less than pristine Co3O4. This structure is expected to prevent volume expansion and particle aggregation of Co3O4 particles in the pores of LTO. As expected, the LTO/Co3O4 composite had higher capacity than that of LTO, with a decreased slope and an extended plateau region over the voltage range of 0.01-3.0 V. Galvanostatic intermittent titration technique (GITT) and X-ray absorption near-edge structure (XANES) spectroscopy were also conducted to determine the relative contribution of LTO and Co3O4 to the characteristics of composite.


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