期刊
ADVANCED SCIENCE
卷 7, 期 3, 页码 -出版社
WILEY
DOI: 10.1002/advs.201902538
关键词
electrochemical performance; interfacial engineering; Li-rich cathodes; lithium ion batteries (LIBs); piezoelectric LiTaO3 coating layer
资金
- National Natural Science Foundation of China (NSFC) [50902044, 51672069]
- Program for Innovative Research Team in Science and Technology in Universities of Henan Province (IRTSTHN) [20IRTSTHN012]
- Foundation of Henan Educational Committee [18A140001]
- Science and Technology Development Project of Henan Province [192102210235]
As one of the most promising cathodes for next-generation lithium ion batteries (LIBs), Li-rich materials have been extensively investigated for their high energy densities. However, the practical application of Li-rich cathodes is extremely retarded by the sluggish electrode-electrolyte interface kinetics and structure instability. In this context, piezoelectric LiTaO3 is employed to functionalize the surface of Li1.2Ni0.17Mn0.56Co0.07O2 (LNMCO), aiming to boost the interfacial Li+ transport process in LIBs. The results demonstrate that the 2 wt% LiTaO3-LNMCO electrode exhibits a stable capacity of 209.2 mAh g(-1) at 0.1 C after 200 cycles and 172.4 mAh g(-1) at 3 C. Further investigation reveals that such superior electrochemical performances of the LiTaO3 modified electrode results from the additional driving force from the piezoelectric LiTaO3 layer in promoting Li+ diffusion at the interface, as well as the stabilized bulk structure of LNMCO. The supplemented LiTaO3 layer on the LNMCO surface herein, sheds new light on the development of better Li-rich cathodes toward high energy density applications.
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