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DOI	10.1039/d0ee02518f
	Ultrafast kinetics in a phase separating electrode material by forming an intermediate phase without reducing the particle size
	Kim M.; Jeong M.; Yoon W.-S.; Kang B.
发表日期	2020
ISSN	17545692
起始页码	4258
结束页码	4268
卷号	13 期号:11
英文摘要	A fast charging/discharging capability in electrode materials is one of the essential properties of Li-ion batteries. A well-known approach for improving the kinetics of electrode materials is minimization of the particle size to the nanoscale, especially for phase separating materials such as LiFePO4 and Li4Ti5O12. Here, we report on ultrafast kinetics in a phase separating material with submicron particles enabled by the formation of an intermediate phase during discharge even without minimizing the particle size. The intermediate phase during (dis)charging acts as a structural buffer between the Li-rich and Li-poor phases, leading to reduced mechanical stress/strain on the interface in a particle, which can suppress structural defects, and a substantial reduction in the phase transformation barrier, which can make the electrochemical reaction of particles in the electrode homogenous. As a result, the resulting phase separating material can deliver ∼70 mA h g-1 at a 200C discharge rate (18 s for full discharge) with a 1C charge rate, and prolonged cycling stability for 1000 cycles even though it has a wide particle size distribution from 50 nm to 600 nm with an average of ∼300 nm. This finding will provide a new avenue for achieving fast electrochemical kinetics with a high volumetric energy density in electrode materials for high performance Li-ion batteries. © The Royal Society of Chemistry.
英文关键词	Electric discharges; Fast charging (Batteries); Iron compounds; Kinetics; Lithium compounds; Lithium-ion batteries; Particle size; Particle size analysis; Phosphorus compounds; Reaction intermediates; Separation; Titanium compounds; Charging/discharging; Electrochemical kinetics; Electrochemical reactions; Electrode material; Intermediate phase; Sub-micron particles; Substantial reduction; Volumetric energy densities; Electrochemical electrodes; electrochemical method; electrode; performance assessment; reaction kinetics; size distribution
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/189486
作者单位	Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, South Korea; Energy Storage and Distributed Resources Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States; Department of Energy Science, Sungkyunkwan University, Suwon, 440-746, South Korea
推荐引用方式 GB/T 7714	Kim M.,Jeong M.,Yoon W.-S.,et al. Ultrafast kinetics in a phase separating electrode material by forming an intermediate phase without reducing the particle size[J],2020,13(11).
APA	Kim M.,Jeong M.,Yoon W.-S.,&Kang B..(2020).Ultrafast kinetics in a phase separating electrode material by forming an intermediate phase without reducing the particle size.Energy & Environmental Science,13(11).
MLA	Kim M.,et al."Ultrafast kinetics in a phase separating electrode material by forming an intermediate phase without reducing the particle size".Energy & Environmental Science 13.11(2020).