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J. Korean Ceram. Soc. > Volume 49(6); 2012 > Article
Journal of the Korean Ceramic Society 2012;49(6): 659.
doi: https://doi.org/10.4191/kcers.2012.49.6.659
리튬이온이차전지용 구형 Li4Ti5O12 음극 합성 및 Y와 Nb 도핑에 따른 전기화학적 특성
지미정, 권용진, 김은경, 박태진, 정성헌, 최병현
한국세라믹기술원 전자소재팀
Preparation of Spherical Li4Ti5O12 and the Effect of Y and Nb Doping on the Electrochemical Properties as Anode Material for Lithium Secondary Batteries
Mi-Jung Ji, Yong-Jin Kwon, Eun-Kyung Kim, Tae-Jin Park, Sung-Hun Jung, Byung-Hyun Choi
Electronic Materials Laboratory, Korea Institute of Ceramic Engineering & Technology
Yttrium (Y) and niobium (Nb) doped spherical $Li_4Ti_5O_{12}$ were synthesized to improve the energy density and electrochemical properties of anode material. The synthesized crystal was $Li_4Ti_5O_{12}$, the particle size was less than $1{mu}m$ and the morphology was spherical and well dispersed. The Y and Nb optimal doping amounts were 1 mol% and 0.5 mol%, respectively. The initial capacity of the dopant discharge and charge capacity were respectively 149mAh/g and 143 mAh/g and were significantly improved compared to the undoped condition at 129 mAh/g. Also, the capacity retention of 0.2 C/5 C was 74% for each was improved to 94% and 89%. It was consequently found that Y and Nb doping into the $Li_4Ti_5O_{12}$ matrix reduces the polarization and resistance of the solid electrolyte interface (SEI) layer during the electrochemical reaction.
Key words: Spherical $Li_4Ti_5O_{12}$, Doping, Li-ion battery
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