Cathode Properties of Phospho-olivine for Lithium Secondary Batteries

Shigeto Okada, Shoichiro Sawa, Minato Egashira, Jun-ichi Yamaki

Research output: Contribution to journalArticle


Four types of orthorhombic olivine LiMPO_4 (M:Co, Fe, Ni, Mn) were investigated as high voltage cathode active materials for lithium secondary batteries. LiCoPO_4 exhibited the highest 4.8V discharge plateau of 100mAh/g vs. Li/Li^+ after initial charging to 5.1V and its energy density was comparable to that of layeredrocksalt LiCoO_2 (120mAh/g×4V=480mWh/g). In contrast, the open circuit voltage profile of LiFePO_4 was 160mAh/g on the 3V plateau. TG-DSC measurements showed that the thermal stability of charged Li_<1-x>CoPO_4 is better than that of fully-charged Li_<1-x>CoO_2. The chemical state of Co in LiCoPO_4 was also analyzed using HRXRF.
Original languageEnglish
Pages (from-to)133-137
Number of pages5
JournalThe Reports of Institute of Advanced Material Study,Kyushu University
Issue number2
Publication statusPublished - 2000


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