Abstract
Four types of orthorhombic olivine LiMPO 4 (M:Co, Fe, Ni and Mn) were investigated as high-voltage cathode active materials for lithium secondary batteries. LiCoPO 4 exhibited the highest 4.8 V discharge plateau of 100 mAh/g versus Li/Li + after initial charging to 5.1 V and its energy density was comparable to that of layered rocksalt LiCoO 2 ( 120 mAh/ g×4 V=480 mWh/g). In contrast, the open circuit voltage profile of LiFePO 4 was 160 mAh/g on the 3 V plateau. The Co 2+ state in LiCoPO 4 was confirmed using HRXRF.
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