Abstract
Synthesis of V2O5 0.2 H2O xerogels by hydrolysis of alkoxide with addition of a surfactant molecule leads to a novel xerogel, which is more amorphous and has a slightly different structure from xerogels prepared by the same method without surfactant. This confers changed lithium insertion properties on the new material. Lithium ions are accommodated at sites different from the sites occupied in xerogels prepared without surfactant. Those new xerogels are able to receive up to almost 2.7 Li/V2O5; this represents one more lithium per V2O5 than other xerogels. On the other hand, they lose a large proportion of this capacity after the first discharge. The behaviour of the kinetic parameters as a function of lithium content also differs in the two xerogels. This shows that insertion of the first lithium ions in ‘classical’ xerogels is difficult but induces a structural change which makes insertion of further lithium easier. This phenomenon was not observed in the xerogels prepared with surfactant. Furthermore, these present better interfacial properties.
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