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Insight into the Atomic Structure of High-Voltage Spinel LiNi0.5Mn1.5O4 Cathode Material in the First Cycle

Authors :
Lin Gu
Michel Armand
Zhenzhong Yang
Richeng Yu
Liubin Ben
Xuejie Huang
Lin Mingxiang
Xiao-Qing Yang
Wang Hao
Haofei Zhao
Xiqian Yu
Yang Sun
Source :
Chemistry of Materials. 27:292-303
Publication Year :
2014
Publisher :
American Chemical Society (ACS), 2014.

Abstract

Application of high-voltage spinel LiNi0.5Mn1.5O4 cathode material is the closest and the most realistic approach to meeting the midterm goal of lithium-ion batteries for electric vehicles (EVs) and plug-in hybrid electric vehicles (HEVs). However, this application has been hampered by long-standing issues, such as capacity degradation and poor first-cycle Coulombic efficiency of LiNi0.5Mn1.5O4 cathode material. Although it is well-known that the structure of LiNi0.5Mn1.5O4 into which Li ions are reversibly intercalated plays a critical role in the above issues, performance degradation related to structural changes, particularly in the first cycle, are not fully understood. Here, we report detailed investigations of local atomic-level and average structure of LiNi0.5Mn1.5O4 during first cycle (3.5–4.9 V) at room temperature. We observed two types of local atomic-level migration of transition metals (TM) ions in the cathode of a well-prepared LiNi0.5Mn1.5O4//Li half-cell during first charge via an aberrati...

Details

ISSN :
15205002 and 08974756
Volume :
27
Database :
OpenAIRE
Journal :
Chemistry of Materials
Accession number :
edsair.doi...........9702fd856c41f68858148184c4b5abd1
Full Text :
https://doi.org/10.1021/cm503972a