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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
Electrochemical property: Structure relationships in monoclinic Li(3-y)V2(PO4)3
S-C Yin1, H Grondey, P Strobel
1Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1.
Journal of the American Chemical Society
|August 21, 2003
Summary
Monoclinic lithium vanadium phosphate, alpha-Li(3)V(2)(PO(4))(3), shows promise for lithium-ion batteries. Structural and electrochemical studies reveal charge ordering and lithium site interactions dictate battery performance.
Area of Science:
- Materials Science
- Electrochemistry
- Solid-State Chemistry
Background:
- Monoclinic lithium vanadium phosphate (alpha-Li(3)V(2)(PO(4))(3)) is a promising cathode material for lithium-ion batteries.
- Its potential stems from good ion mobility and high lithium capacity due to reversible extraction of three lithium ions.
Purpose of the Study:
- To correlate structural features of Li(3-y)V(2)(PO(4))(3) materials with their electrochemical voltage-composition profiles.
- To understand the factors influencing electrochemical behavior and phase transitions.
Main Methods:
- Neutron diffraction studies.
- (7)Li Magic Angle Spinning Nuclear Magnetic Resonance ((7)Li MAS NMR) spectroscopy.
- Electrochemical analysis of voltage-composition profiles.
Main Results:
- Established a correlation between structural characteristics and electrochemical performance.
- Identified charge ordering on vanadium sites and lithium ordering/disordering on lattice sites as key factors.
- Observed hysteresis in the electrochemical curve attributed to these ordering phenomena.
Conclusions:
- Vanadium charge ordering and lithium site occupancy significantly influence the electrochemical properties of alpha-Li(3)V(2)(PO(4))(3).
- Ion-ion interactions play a crucial role in determining phase transitions within these materials.
- Understanding these relationships is vital for optimizing cathode materials for advanced lithium-ion batteries.
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