In situ formation of LiF decoration on a Li-rich material for long-cycle life and superb low-temperature performance

The electrochemical properties of layered Li-rich oxide Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 (LLO) can be enhanced by coating various materials. This paper demonstrates, for the first time, that an in situ formation of an ultrathin and uniform LiF coating layer on LLO is realized via the decomposition...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2019, Vol.7 (18), p.11513-11519
Main Authors: Ding, Xiang, Li, Yi-Xuan, Chen, Fei, He, Xiao-Dong, Yasmin, Aqsa, Hu, Qiao, Wen, Zhao-Yin, Chen, Chun-Hua
Format: Article
Language:English
Subjects:
Coatings
Decay
Decay rate
Diffusion coating
Diffusion rate
Electric potential
Electrochemical analysis
Electrochemistry
Energy storage
Ion diffusion
Kinetics
Lithium
Lithium fluoride
Lithium ions
Low temperature
Product design
Protective coatings
Structural stability
Voltage
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Summary:The electrochemical properties of layered Li-rich oxide Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 (LLO) can be enhanced by coating various materials. This paper demonstrates, for the first time, that an in situ formation of an ultrathin and uniform LiF coating layer on LLO is realized via the decomposition of LiPF 6 , which can effectively protect the surface of the LLO electrode, resulting in much enhanced structural stability and faster lithium ion diffusion kinetics. Such LiF coated LLO shows markedly improved cycle life, rate capability, low-temperature performance and suppressed voltage decay. It exhibits a capacity retention of 93% beyond 1000 cycles at 10C, a capacity of 112 mA h g −1 at −30 °C and a negligible voltage decay of 0.0023 V per cycle, displaying great application prospects in such energy storage materials.
ISSN:2050-7488
2050-7496
DOI:10.1039/C9TA02461A