Electrochemical properties of sol-gel Li4/3Ti5/3O4

The synthesis of a mixed lithium titanium spinel Li4/3Ti5/3O4 obtained via a sol-gel process in non aqueous media is reported. The electrochemical beh aviour of the sol-gel Li4/3Ti5/3O4 spinel oxide is examined. A voltage plat eau located at 1.55 V corresponds to the reversible insertion of 0.95 lithi um ions in this compound while the structure is shown to be unchanged. The chemical diffusion coefficient of lithium has been evaluated by a.c. impeda nce: D-Li is found equal to 3 X 10(-12) cm(2) s(-1) for x = 0.2 in Li(4/3+0 .2)Ti5/3O4. (C) 1999 Elsevier Science S.A. All rights reserved.