抄録
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.
| 本文言語 | 英語 |
|---|---|
| ページ（範囲） | 133-137 |
| ページ数 | 5 |
| ジャーナル | The Reports of Institute of Advanced Material Study,Kyushu University |
| 巻 | 14 |
| 号 | 2 |
| DOI | |
| 出版ステータス | 出版済み - 2000 |