Sol Gel Intercalation Materials for Lithium Batteries

Abstract

This paper emphasizes the interest of sol-gel synthesis in obtaining high performance cathodic materials. New vanadium oxides, vanadium bronzes (MxV205) and manganese oxides (MnO 2 ) are prepared via the sol-gel process using inorganic precursors in aqueous medium. Their electrochemical behaviour (working potential, specific capacity, kinetics of Li transport, rechargeability, cycle life) is investigated and discussed in relation with their specific structural, chemical and physical features. In particular, the results are compared to that achieved for the corresponding classical compounds prepared via a synthesis route involving solid state reactions or precipitation reactions.

The sol-gel mixed oxide Cr0.11V2O5.16: An attractive cathodic material for secondary lithium batteries

“…Nevertheless, the insertion of more than one lithium per V205 involves important and irreversible structural deformations which limit the rechargeability of the material after high depths of discharge. Sol-gel process is used here to incorporate several trivalent metallic cations into the V205 lattice in order to improve its performances [1][2][3][4][5]. Indeed, previous works have demonstrated that the compound Feo.11-V205.16 obtained by incorporating Fe 3+ ions presents a structure that better adapts oneself to high Li uptake than does V205 [6][7][8].…”