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제125회 대한화학회 학술발표회 및 총회 The formation mechanism of Li4Ti5O12-y solid solutions prepared by carbonthermal reduction and the effect of Ti3+ on electrochemical performance

등록일
2020년 2월 6일 11시 00분 40초
접수번호
0728
발표코드
ELEC.P-909 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
온라인 PDF 제출
발표형식
포스터
발표분야
Electrochemistry
저자 및
공동저자
Guijun Yang, Soo-Jin Park1,*
Department of Chemistry, Inha University, China
1Department of Chemistry, Inha University, Korea
Samples of Li4Ti5O12-y solid solutions are synthesized by one-step solid-state carbonthermal reduction reaction using Li2CO3, anatase, and carbon black under a nitrogen atmosphere. The underlying formation mechanism that leads to Li4Ti5O12-y solid solutions is proposed. The formation mechanism of the Li4Ti5O12-y solid solution is investigated by in situ variable temperature X-Ray diffraction (VT-XRD) and thermogravimetric analysis/differential scanning calorimetry system (TGA-DSC). First, some Ti4+ centers are converted to Ti3+ (TiO2-TiO2-x) because of the presence of carbon black. Secondly, Li2CO3 reacts with TiO2-x (anatase) to form Li2TiO3. Thirdly, Li2TiO3 reacts with TiO2-x to form the Li4Ti5O12-y solid solution, while anatase starts to transform into rutile at the same time. Rutile reacts with Li2TiO3 to form Li4Ti5O12-y at higher temperatures. The presence of Ti3+ not only improves the electrical conductivity but also improves the ionic conductivity. As a result, the as-prepared material exhibits good rate capability and cycling stability with 99.3% capacity retention after 200 cycles.

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