Solid Solution Phases in the Olivine-Type LiMnPO4/MnPO4 System

Journal Article · Tue Apr 07 04:00:00 EDT 2009 · Electrochemical Society

OSTI ID:984313

Chen, Guoying; Richardson, Thomas J

Nonstoichiometry is reported in the LiMnPO{sub 4}/MnPO{sub 4} system for the first time. As lithium is removed from crystalline LiMnPO{sub 4} by chemical or electrochemical methods, the resulting two phase mixture consists of stoichiometric LiMnPO{sub 4} and a delithiated phase, Li{sub y}MnPO{sub 4}, whose lattice parameters depend upon the global extent of delithiation and on the crystalline domain size of the delithiated phase. This behavior is reproduced during electrochemical insertion of lithium. Again, no evidence for nonstoichiometry was found in the vicinity of LiMnPO{sub 4}. Attempts to create single phase solid solutions by heating mixtures of the two phases failed due to the thermal instability of Li{sub y}MnPO{sub 4}.

• Research Organization: Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
• Sponsoring Organization: Environmental Energy Technologies Division
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 984313
• Report Number(s): LBNL-3566E
• Journal Information: Electrochemical Society, Journal Name: Electrochemical Society
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
HEATING
INSTABILITY
LATTICE PARAMETERS
LITHIUM
MIXTURES
SOLID SOLUTIONS