1. Mixed lithium ion and electron conducting LiAlPO3.93F1.07-coated LiCoO2 cathode with improved electrochemical performance.
- Author
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Shen, Bin, Liu, Qianqian, Wang, Liguang, Yin, Geping, Zuo, Pengjian, Ma, Yulin, Cheng, Xinqun, Du, Chunyu, and Gao, Yunzhi
- Subjects
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LITHIUM ions , *ELECTROCHEMISTRY , *LITHIUM cobalt oxide , *ELECTRIC conductivity , *CHEMICAL stability , *SURFACE coatings - Abstract
LiCoO 2 (LCO) has been functionally modified by mixed lithium ion and electron conducting LiAlPO 3.93 F 1.07 (LAPF) for the first time. Due to the unique coating layer with accepted Li-ion diffusion rate and electronic conductivity, the LAPF-coated LCO exhibits outstanding rate capability and cycle stability in the voltage range of 2.75–4.55 V. This material delivered a specific capacity of 206 mAh·g − 1 up to 0.5C rate and the capacity retention was 91.7% after 50 cycles, which is a remarkable improvement comparing with uncoated LCO (34.8%). It also exhibited superior rate capability with a discharge capacity of 161.4 mAh·g − 1 at 4C. The functionalized LAPF coating technique is an efficient approach to improve the electrochemical performance of LCO and can also be referred for other layered oxide cathode materials. [ABSTRACT FROM AUTHOR]
- Published
- 2017
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