Enhanced Cycling Performance of LiNi0.9Co0.08Al0.02O2 via Co-Rich Surface

High-capacity LiNi 0.90 Co 0.08 Al 0.02 O 2 with a Co-rich surface has been synthesized by a coprecipitation technique. The results of elemental, morphology, and structure analyses suggest that Co(OH) 2 was uniformly coated on the nickel-cobalt-aluminum hydroxide precursor, providing a Co-rich surfa...

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Bibliographic Details
Published in:JOM (1989) 2020-02, Vol.72 (2), p.738-744
Main Authors: Huang, Jinlong, Duan, Jianguo, Du, Ke, Cao, Yanbing, Peng, Zhongdong, Hu, Guorong
Format: Article
Language:English
Subjects:
Advances in Surface Engineering
Aluminum hydroxide
Cathodes
Chemistry/Food Science
Cobalt
Decomposition
Earth Sciences
Electrode materials
Electrolytes
Engineering
Environment
Morphology
Nickel
Physics
Scanning electron microscopy
Spectrum analysis
Storage stability
Surface layers
Surface stability
Temperature
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Summary:High-capacity LiNi 0.90 Co 0.08 Al 0.02 O 2 with a Co-rich surface has been synthesized by a coprecipitation technique. The results of elemental, morphology, and structure analyses suggest that Co(OH) 2 was uniformly coated on the nickel-cobalt-aluminum hydroxide precursor, providing a Co-rich surface layer on the Ni-based cathode material. Electrochemical tests and pH measurements demonstrated that the Co-rich coating increased the Li storage ability of the cathode. The cathode displayed high discharge capacity of ~ 207 mAh g −1 and 194 mAh g −1 at rates of 0.2°C and 1°C, respectively, and high-capacity retention of 90.2% after 100 cycles at rate of 1°C, representing better performance than that of the reference sample. The Co surface enrichment also decreased the pH of the material and restrained the formation of high-resistance Li-based residues during air exposure, illustrating that such a Co-rich surface can improve the storage stability of LiNi 0.90 Co 0.08 Al 0.02 O 2 .
ISSN:1047-4838
1543-1851
DOI:10.1007/s11837-019-03734-y