상세정보
학술지
Superior Charge-Transfer Kinetics of NASICON-Type Li3V 2(PO4)3 Cathodes by Multivalent Al3+ and Cl- Substitutions
- 저자
- 손주남, 김신호, 김민철, 김광진, V. Aravindan, 이영기, 이윤성
- 발행일
- 201305
- 출처
- Electrochimica Acta, v.97, pp.210-215
- ISSN
- 0013-4686
- 출판사
- Elsevier
- 협약과제
- 12MB4100, 중대형 전고체 리튬이차전지용 유무기 하이브리드 고체전해질, 이영기
- 초록
- The kinetic properties of Li insertion in NASICON-type Li3V 2(PO4)3 cathodes were enhanced substantially by Al3+ and Cl- multivalent substitutions of various concentrations. Pristine and carbon coated, Al-doped Li3V 2(PO4)3 were also prepared by a conventional solid-state approach under optimized conditions. Samples phase purity was investigated through X-ray diffractometry. Li insertion was studied in half-cells at 3-4.8 V vs. Li for the removal of 3 mol of Li. Carbon-coated Li3V1.98Al0.02(PO4) 2.99Cl0.01 showed the highest reversible insertion of 2.71 mol of Li (178 mAh g-1) at a current density of 0.2 mA cm -2. It showed a capacity retention of over 80% after 100 cycles. Cl- substitution led to improved performance under harsh conditions of 15 C rate and high temperature (50 °C). The enhancement of Li ion kinetics was demonstrated through cyclic voltammetry in a two-electrode configuration and electrochemical impedance spectroscopy confirmed the enhanced conductivity. © 2013 Elsevier Ltd. All rights reserved.
- KSP 제안 키워드
- Al-doped, Carbon coated, Charge-transfer kinetics, Cyclic voltammetry, Enhanced conductivity, Half-cells, High Temperature, Impedance spectroscopy(IS), Kinetic properties, Li insertion, Li ion kinetics