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

Abstract

The electrochemical properties of layered Li-rich oxide Li1.2Ni0.13Co0.13Mn0.54O2 (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 LiPF6, which can effectively protect the surface of 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 10 C, 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.

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Publication details

The article was received on 06 Mar 2019, accepted on 09 Apr 2019 and first published on 09 Apr 2019


Article type: Paper
DOI: 10.1039/C9TA02461A
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript

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

    X. Ding, Y. Li, F. Chen, X. D. He, A. Yasmin, Q. Hu, Z. Wen and C. Chen, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA02461A

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