Thermal Instability of Olivine-Type LiMnP04 Cathodes

Journal Article · Tue Jul 07 00:00:00 EDT 2009 · Journal of Power Sources

OSTI ID:984357

Chen, Guoying; Richardson, Thomas J

The remarkable thermal stability of LiFePO{sub 4} and its charged counterpart, FePO{sub 4}, have been instrumental in its commercialization as a lithium ion battery cathode material. Despite the similarity in composition and structure, and despite the high thermal stability of the parent compound, LiMnPO{sub 4}, we find that the delithiated phase Li{sub y}MnPO{sub 4}, (which contains a small amount of residual lithium), is relatively unstable and reactive toward a lithium ion electrolyte. The onset temperature for heat evolution in the presence of 1M LiPF{sub 6} in 1:1 ethylene carbonate/propylene carbonate is around 150 C, and the total evolved heat is 884 J/g, comparable to that produced under similar conditions by charged LiCoO{sub 2} electrodes.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: Environmental Energy Technologies Division
• DOE Contract Number: DE-AC02-05CH11231
• OSTI ID: 984357
• Report Number(s): LBNL-3579E; JPSODZ; TRN: US201015%%1113
• Journal Information: Journal of Power Sources, Journal Name: Journal of Power Sources; ISSN 0378-7753
• Country of Publication: United States
• Language: English

Related Subjects

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CARBONATES
CATHODES
COMMERCIALIZATION
ELECTRODES
ETHYLENE
INSTABILITY
LITHIUM
LITHIUM IONS
STABILITY