Low-temperature lithium-manganese oxide cathode materials for polymer batteries

Low-temperature spinel phases with physico-chemical characteristics adapted to solid polymer electrolyte environment are prepared as 3 V intercalation material for rechargeable lithium batteries. The lithium intercalation compounds are made by solid-state reaction of an intimate mixture of specifically prepared beta-MnO2 (pyrolusite) and lithium salts at various temperatures between 150 and 450 degrees C. The experimental results show a direct relation between the composition of the spinel phase obtained and the synthesis temperature. The electrochemical tests show interesting results in terms of reversibility, energy and power density.