Two-phase LiCoO2 oxides for rechargeable lithium batteries

There is a considerable improvement in energy density and rate capability o f LiCoO2 material when an inert ceramic material is introduced into this ma terial as a distinct separate phase. Electrochemical performance as a funct ion of ceramic content shows that high and optimum performance are obtained when TiO2 concentration is at 2 mass %. Introduction of TiO2 into LiCoO2 a lso helps to achieve extended cycle life for LiCoO2 materials. We show that by increasing rate capability and at the same time decreasing polarization at the cathode, increases in energy and specific capacities are obtained. (C) 2001 The Electrochemical Society.