Process for the preparation of lithium titanium spinel and its use

摘要

Non-doped and doped lithium titanate Li4Ti5O12 obtainable by the thermal reaction of a stoichiometric composite oxide containing Li2TiO3 and TiO2, the preparation of the stoichiometric composite oxide, as well as a process for the preparation of lithium titanate Li4Ti5O12 and its use as anode material in rechargeable lithium-ion batteries.

主权项

1. A process for the preparation of phase-pure doped or non-doped lithium titanate Li4Ti5O12 comprising the steps of
a) providing an aqueous solution of LiOH; b) reacting the aqueous LiOH solution by adding solid TiO2 at a temperature in the range from 100-250° C. under hydrothermal conditions over a period of 10 to 30 hours such that a composite oxide is obtained containing Li2TiO3 in cubic phase and TiO2 in anatase modification having a molar ratio of TiO2 to Li2TiO3 in the range of 1.3 to 1.85 and a particle size of 100-300 nm; and c) sintering the composite oxide at a temperature of ≦750° C.