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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.
- 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]
- Subjects :
- THERMAL stability
ENERGY density
LITHIUM-ion batteries
Subjects
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