Towards improved structural stability and electrochemical properties of a Li-rich material by a strategy of double gradient surface modification

doi:10.1016/j.nanoen.2019.04.078

SIC OpenIR

	Towards improved structural stability and electrochemical properties of a Li-rich material by a strategy of double gradient surface modification
	Ding, Xiang; Li, Yi-Xuan; Wang, Shuo; Dong, Jie-Min; Yasmin, Aqsa; Hu, Qiao; Wen, Zhao-Yin; Chen, Chun-Hua
	2019-07-01
Source Publication	NANO ENERGY
ISSN	2211-2855
Volume	61 Pages:411
Subtype	Article
Abstract	The electrochemical properties of layered Li-rich oxide Li1.2Ni0.13Co0.13Mn0.54O2 (LLO) can be enhanced by a facile NaF surface modification. We have clarified by XPS, HR-TEM and HAADF-STEM analyses that the mechanism is the formations of a gradient coating layer Na1-xLixF and a gradient LLO surface Li1.2-xNaxNi0.13Co0.13Mn0.54O2 via a Li+/Na+ exchange reaction. The exchange reaction occurs at the Li-slabs of LLO down to a depth of less than 15 nm. After such a double gradient surface modification, the LLO displays markedly improved cycle life and rate capability as well as suppressed voltage decay. It exhibits a capacity retention of 85% beyond 1000 cycles at 10 C and a voltage decay of only 0.0021 V per cycle at 0.5 C, revealing great application prospects in energy storage materials.
Keyword	Li-rich cathode Sodium fluoride Double gradient Interface Long-cycle life
DOI	10.1016/j.nanoen.2019.04.078
Language	英语
WOS Research Area	Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics
Publisher	ELSEVIER SCIENCE BV
Citation statistics	Cited Times:10[WOS] [WOS Record] [Related Records in WOS]
Document Type	期刊论文
Identifier	http://ir.sic.ac.cn/handle/331005/27012
Collection	中国科学院上海硅酸盐研究所
Recommended Citation GB/T 7714	Ding, Xiang,Li, Yi-Xuan,Wang, Shuo,et al. Towards improved structural stability and electrochemical properties of a Li-rich material by a strategy of double gradient surface modification[J]. NANO ENERGY,2019,61:411.
APA	Ding, Xiang.,Li, Yi-Xuan.,Wang, Shuo.,Dong, Jie-Min.,Yasmin, Aqsa.,...&Chen, Chun-Hua.(2019).Towards improved structural stability and electrochemical properties of a Li-rich material by a strategy of double gradient surface modification.NANO ENERGY,61,411.
MLA	Ding, Xiang,et al."Towards improved structural stability and electrochemical properties of a Li-rich material by a strategy of double gradient surface modification".NANO ENERGY 61(2019):411.

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