Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 156, Issue 8, Pages A635-A638Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.3138705
Keywords
cathodes; electron microscopy; lithium compounds; manganese compounds; secondary cells; solid-state phase transformations; X-ray diffraction
Funding
- WCU program [31-2008-000-10055-0]
- General Research grant program [R01-2008-000-10913-0]
- Korea Science and Engineering Foundation (KOSEF)
- Ministry of Education, Science and Technology (MEST)
- Ministry of Knowledge Economy [2008-EEL-11- P-08-3-010]
- Korea Research Foundation (KRF)
- Korean Government (MEST) [KRF-2008-331-D00243]
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The phase stability of Li1-xMnPO4 (0 <= x <= 1) is investigated in this study for different Li compositions and temperatures by high temperature X-ray diffraction and electron microscopy. The map of stable phases is determined at temperature ranges between room temperature and 410 degrees C. While pure LiMnPO4 phase is stable at high temperature, partial phase transformation of MnPO4 into Mn2P2O7 is observed in delithiated phases above 210 degrees C. Electron microscopy study also indicates the instability of the delithiated phase. The morphology of LiMnPO4 is severely damaged upon delithiation. The instability of the delithiated phase and the phase transformation into Mn2P2O7 may imply that safety concerns can be raised regarding the LiMnPO4 cathode, unlike its Fe counterpart.
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