| 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 |
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| ABSTRACT |
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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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