期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 13, 页码 7118-7128出版社
AMER CHEMICAL SOC
DOI: 10.1021/am507951x
关键词
Li-rich layered oxides; Li2RuO3; cathodes; cycle life; power density
资金
- MKE (The Ministry of Knowledge Economy), Korea, under the ITRC (Information Technology Research Center) support program [NIPA-2013-H0301-13-1009]
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology
- NRF through the Human Resource Training Project for Regional Innovation
Li-rich layered oxides are the most attractive cathodes for lithium-ion batteries due to their high capacity (>250 mAh g(-1)). However, their application in electric vehicles is hampered by low power density and poor cycle life. To address these, layered Li2Ru0.75Ti0.25O3 (LRTO) was synthesized and the influence of electroinactive Ti4+ on the electrochemical performance of Li2RuO3 was investigated. LRTO exhibited a reversible capacity of 240 mAh g(-1) under 14.3 mA g(-1) with 0.11 mol of Li loss after 100 cycles compared to 0.22 mol of Li for Li(2)Ru(0.75)Sn(0.2)5O(3). More Li+ can be extracted from LRTO (0.96 mol of Li) even after 250 cycles at 143 mA g(-1) than Li2RuO3 (0.79 mol of Li). High reversible Li extraction and long cycle life were attributed to structural stability of the LiM2 layer in the presence of Ti4+, facilitating the lithium diffusion kinetics. The versatility of the Li2MO3 structure may initiate exploration of Ti-based Li-rich layered oxides for vehicular applications.
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