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Li3V2(PO4)(3) Addition to the Olivine Phase: Understanding the Effect in Electrochemical Performance

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Title Li3V2(PO4)(3) Addition to the Olivine Phase: Understanding the Effect in Electrochemical Performance
 
Creator SARKAR, S
MITRA, S
 
Subject LITHIUM-ION BATTERIES
COMPOSITE CATHODE MATERIAL
CARBON NANOTUBES COMPOSITE
VANADIUM-MODIFIED LIFEPO4
GRAPHITE-ELECTRODES
INTERCALATION ELECTRODES
PHOSPHO-OLIVINES
COATED LIFEPO4
PARTICLE-SIZE
DOPED LIFEPO4
 
Description Several chemical compositions of (1 - x)LiFePO4-xLi(3)V(3)(PO4)(3) with Li3V2(PO4)(3) decorated LiFePO4 morphology are synthesized via modified solid-state synthesis. The current study is undertaken to establish a relation between composite formation and their electrochemistry as an excellent cathode material. A detailed physical and structural investigation revealed the formation of a Li3V2(PO4)(3) decorated LiFePO4 composite. To investigate the electrochemical performance of LiFePO4-Li3V2(PO4)(3) composites, a series of compositions are prepared with end member of LiFePO4 and Li3V2(PO4)(3). A specific composition of 0.97LiFePO(4)-0.03Li(3)V(3)(PO4)(3) shows a high reversible capacity of similar to 163.8 mAh g(-1) at 1 C current rate in the potential window of 2-4.5 V. The present study could provide a great physical insight into the stability of solid electrolyte interface and subsequent decrease in charge transfer resistance of composite materials and exhibits an excellent electrode kinetics and electrochemical stability compared to pristine LiFePO4. Electrode kinetics is studied at 100% depth of discharge at open circuit potential and continuous charge discharge cycle by the electrochemical impedance spectroscopy technique. It is observed that the improvement of electrochemical performance is mainly controlled by the Li3V2(PO4)(3) phase because of its unique three-dimensional open structure. Finally, understanding the physical and electrochemical behavior of the (1 - x)LiFePO4-xLi(3)V(3)(PO4)(3) composite electrode is studied that could be useful to design new cathode materials further for lithium ion batteries.
 
Publisher AMER CHEMICAL SOC
 
Date 2014-12-29T05:50:00Z
2014-12-29T05:50:00Z
2014
 
Type Article
 
Identifier JOURNAL OF PHYSICAL CHEMISTRY C, 118(22)11512-11525
1932-7447
http://dx.doi.org/10.1021/jp500343t
http://dspace.library.iitb.ac.in/jspui/handle/100/17236
 
Language English