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Structure Evolution and Thermal Stability of High-Energy-Density Li-Ion Battery Cathode Li2VO2F.

Structure Evolution and Thermal Stability of High-Energy-Density Li-Ion Battery Cathode Li2VO2F.

Authors :
Xiaoya Wang
Yiqing Huang
Dongsheng Ji
Omenya, Fredrick
Karki, Khim
Sallis, Shawn
Piper, Louis F. J.
Wiaderek, Kamila M.
Chapman, Karena W.
Chernova, Natasha A.
Whittingham, M. Stanley
Source :
Journal of The Electrochemical Society; 2017, Vol. 164 Issue 7, pA1552-A1558, 7p
Publication Year :
2017

Abstract

Lithium-ion batteries (LIBs) provide high-energy-density electrochemical energy storage, which plays a central role in advancing technologies ranging from portable electronics to electric vehicles (EVs). However, a demand for lighter, more compact devices and for extended range EVs continues to fuel the need for higher energy density storage systems. Li<subscript>2</subscript>VO<subscript>2</subscript>F, which is synthesized in its lithiated state, allows two-electron transfer per formula during the electrochemical reaction providing a high theoretical capacity of 462 mAh/g. Herein, the synthesis and electrochemical performance of Li<subscript>2</subscript>VO<subscript>2</subscript>F are optimized. The thermal stability of Li<subscript>2</subscript>VO<subscript>2</subscript>F, which is related to the safety of a battery is studied by thermal gravimetric analysis. The structure and vanadium oxidation state evolution along Li cycling are studied by ex-situ X-ray diffraction and absorption techniques. It is shown that the rock-salt structure of pristine Li<subscript>2</subscript>VO<subscript>2</subscript>F is stable up to at least 250°C, and is preserved upon Li cycling, which proceeds by the solid-solution mechanism. However, not all Li can be removed from the structure upon charge to 4.5 V, limiting the experimentally obtained capacity. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00134651
Volume :
164
Issue :
7
Database :
Supplemental Index
Journal :
Journal of The Electrochemical Society
Publication Type :
Academic Journal
Accession number :
123694441
Full Text :
https://doi.org/10.1149/2.1071707jes