Improving the structural stability of Li-rich cathode materials via reservation of cations in the Li-slab for Li-ion batteries

doi:10.1007/s12274-017-1489-3

CORC > 化学研究所 > 中国科学院化学研究所

	Improving the structural stability of Li-rich cathode materials via reservation of cations in the Li-slab for Li-ion batteries
	Shi, Ji-Lei 1,3; Xiao, Dong-Dong 2; Zhang, Xu-Dong 1,3; Yin, Ya-Xia 1; Guo, Yu-Guo1,3 ; Gu, Lin 2; Wan, Li-Jun 1
刊名	NANO RESEARCH
	2017-12-01
卷号	10 期号:12 页码:4201-4209
关键词	Li-ion Batteries Cathode Materials Lithium-rich Voltage Decay
ISSN号	1998-0124
DOI	10.1007/s12274-017-1489-3
英文摘要	High-capacity Li-rich cathode materials can significantly improve the energy density of lithium-ion batteries, which is the key limitation to miniaturization of electronic devices and further improvement of electrical-vehicle mileage. However, severe voltage decay hinders the further commercialization of these materials. Insights into the relationship between the inherent structural stability and external appearance of the voltage decay in high-energy Li-rich cathode materials are critical to solve this problem. Here, we demonstrate that structural evolution can be significantly inhibited by the intentional introduction of certain adventive cations (such as Ni2+) or by premeditated reservation of some of the original Li+ ions in the Li slab in the delithiated state. The voltage decay of Li-rich cathode materials over 100 cycles decreased from 500 to 90 or 40 mV upon introducing Ni2+ or retaining some Li+ ions in the Li slab, respectively. The cations in the Li slab can serve as stabilizers to reduce the repulsion between the two neighboring oxygen layers, leading to improved thermodynamic stability. Meanwhile, the cations also suppress transition metal ion migration into the Li slab, thereby inhibiting structural evolution and mitigating voltage decay. These findings provide insights into the origin of voltage decay in Li-rich cathode materials and set new guidelines for designing these materials for high-energy-density Li-ion batteries.
语种	英语
出版者	TSINGHUA UNIV PRESS
WOS记录号	WOS:000417196000011
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/45253]
专题	中国科学院化学研究所
通讯作者	Guo, Yu-Guo; Gu, Lin; Wan, Li-Jun
作者单位	1.Chinese Acad Sci, Inst Chem, CAS Res Educ Ctr Excellence Mol Sci, CAS Key Lab Mol Nanostruct & Nanotechnol, Beijing 100190, Peoples R China 2.Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Inst Phys, Beijing 100190, Peoples R China 3.Univ Chinese Acad Sci, Sch Chem & Chem Engn, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Shi, Ji-Lei,Xiao, Dong-Dong,Zhang, Xu-Dong,et al. Improving the structural stability of Li-rich cathode materials via reservation of cations in the Li-slab for Li-ion batteries[J]. NANO RESEARCH,2017,10(12):4201-4209.
APA	Shi, Ji-Lei.,Xiao, Dong-Dong.,Zhang, Xu-Dong.,Yin, Ya-Xia.,Guo, Yu-Guo.,...&Wan, Li-Jun.(2017).Improving the structural stability of Li-rich cathode materials via reservation of cations in the Li-slab for Li-ion batteries.NANO RESEARCH,10(12),4201-4209.
MLA	Shi, Ji-Lei,et al."Improving the structural stability of Li-rich cathode materials via reservation of cations in the Li-slab for Li-ion batteries".NANO RESEARCH 10.12(2017):4201-4209.