期刊
CERAMICS INTERNATIONAL
卷 42, 期 13, 页码 14587-14594出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2016.06.074
关键词
Lithium-ion batteries; Cathode; Surface coating; High voltage
资金
- National Natural Science Foundation of China [51372060, 31501576]
A facile chemical deposition method has been adopted to prepare cerium fluoride (CeF3) surface modified LiNi1/3Co1/3Mn1/3O2 as cathode material for lithium-ion batteries. Structure analyses reveal that the surface of LiNi1/3Co1/3Mn1/3O2 particles is uniformly coated by CeF3. Electrochemical tests indicate that the optimal CeF3 content is 1 wt%. The 1 wt% CeF3-coated LiNi1/3Co1/3Mn1/3O2 can deliver a discharge capacity of 107.1 mA h g(-1) even at 5 degrees C rate, while the pristine does only 57.3 mA h g(-1). Compared to the pristine, the 1 wt% CeF3-coated LiNi1/3Co1/3Mn1/3O2 exhibits the greatly enhanced capacity and cycling stability in the voltage range of 3.0-4.5 V, which suggests that the CeF3 coating has the positive effect on the high-voltage application of LiNi1/3Co1/3Mn1/3O2. According to the analyses from electrochemical impedance spectra, enhanced electrochemical performance is mainly because the stable CeF3 coating layer can prevent the HF-containing electrolyte from continuously attacking the LiNi1/3Co1/3Mn1/3O2 cathode and retard the passivating layer growth on the cathode. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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