Preparation of LiCoPO4 for Lithium Battery Cathodes through Solution Process

Single phase LiCoPO4 powders with olivine structure were synthesized from solution containing lithium acetate, cobalt acetate and phosphoric acid. Single phase of LiCoPO4 was obtained with a heat treatment at 700°C for 2 h. When the LiCoPO4 powders were used as cathode materials of electrochemical cell with organic electrolytes, a plateau around 5.0 V against lithium metal was observed for the charge and discharge curves. The charge-discharge efficiency was about 85% after 2nd cycle. When the all-solid-state lithium battery was constructed, discharge at around 4.1 V against indium metal was observed with small discharge capacity.