Structural and Electrochemical Properties of ω-Li[sub x]V[sub 2]O[sub 5] (0.4≤x≤3) as Rechargeable Cathodic Material for Lithium Batteries

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Abstract
The ω­LixV2O5ω­LixV2O5 phase (0.4⩽x⩽3)(0.4⩽x⩽3) has been investigated as rechargeable cathodic material for lithium batteries. The interest in using the ω phase as rechargeable electrode consists in the stability of its tetragonal structure (ΔV/V<1%)(ΔV/V2.2⩽x⩽3,2.2⩽x⩽3, hindering the use of high current densities. However, at C/20 rate a remarkable and stable specific capacity of 310 mAh g−1 is obtained over 30 cycles. Its cycling behavior in the 3.8/1.5 V voltage window has been shown to strongly depend on the C rate and temperature. At a higher rate (C/5), the capacity decline observed as galvanostatic cycling proceeds has been found to originate from a significant dissolution process of the vanadium oxide, leading to the presence of VIVVIV and VIIIVIII species in electrolyte. © 2004 The Electrochemical Society. All rights reserved.

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