Designing high-voltage and high-rate Li1-xNaxCoO2 by enlarging Li layer spacing

doi:10.1016/j.electacta.2018.04.043

ISL OpenIR > 青海盐湖研究所知识仓储

	Designing high-voltage and high-rate Li1-xNaxCoO2 by enlarging Li layer spacing
	Li, Qi; Wu, Kang; Chen, Minmin; Lee, Yu Lin; Chen, Dongfeng; Wu, Meimei; Li, Faqiang; Xiao, Xiaoling; Hu, Zhongbo
	2018-05-20
发表期刊	ELECTROCHIMICA ACTA
ISSN	0013-4686
卷号	273 页码:145-153
关键词	Na-doped Licoo2 High-voltage Performance High-rate Performance Li Layer Spacing Li++ Migration
摘要	In our work, a series of Li1-xMxCoO2 (M = Na, x = 0-0.05) samples are synthesized by the solid-state calcination route. Electrochemical measurements show that high-rate capacities and high-voltage performances receive obvious improvements with an appropriate content of Na-doping. Specially, the capacity retentions of Li0.97Na0.03CoO2 and LiCoO2 are 65.6% and 62.7% after the 100th cycle at 3.0-4.5 V, respectively. The discharge capacity of Li-0.97 Na0.03CoO2 compared with the pristine electrode LiCoO2 is greatly enhanced from 125 to 135 mAh.g-(1) at the rate of 5 C and 98 to 120 mAh.g(-1) at the rate of 10 C (1C = 140 mA g(-1)) respectively. With the larger radius of Na+ substituted for the smaller radius of Lithorn, it is found that the bond length of Li-O is reduced from 2.0801 angstrom to 2.0781 angstrom, which is helpful for stabilizing the structure of LiCoO2 and improving the cycle capability at high voltages. At the same time, the interplanar distance of Li slabs is expanded from 2.5904 angstrom to 2.59511 angstrom which can accelerate the diffusion of Lithorn and improve the rate capacity. Therefore, Na doped LiCoO2 shows outstanding high-voltage and high-rate performances, and the strategy can also be popularized and applied to other layered cathodes. (c) 2018 Published by Elsevier Ltd.
DOI	10.1016/j.electacta.2018.04.043
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/6466
专题	青海盐湖研究所知识仓储盐湖资源与化学实验室
推荐引用方式 GB/T 7714	Li, Qi,Wu, Kang,Chen, Minmin,et al. Designing high-voltage and high-rate Li1-xNaxCoO2 by enlarging Li layer spacing[J]. ELECTROCHIMICA ACTA,2018,273:145-153.
APA	Li, Qi.,Wu, Kang.,Chen, Minmin.,Lee, Yu Lin.,Chen, Dongfeng.,...&Hu, Zhongbo.(2018).Designing high-voltage and high-rate Li1-xNaxCoO2 by enlarging Li layer spacing.ELECTROCHIMICA ACTA,273,145-153.
MLA	Li, Qi,et al."Designing high-voltage and high-rate Li1-xNaxCoO2 by enlarging Li layer spacing".ELECTROCHIMICA ACTA 273(2018):145-153.

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