Solid Solution Phases in Olivine-Type LiMnPO4/MnPO4 System

Solid Solution Phases in Olivine-Type LiMnPO4/MnPO4 System

TitleSolid Solution Phases in Olivine-Type LiMnPO4/MnPO4 System
Publication TypeJournal Article
Year of Publication2009
AuthorsGuoying Chen, Thomas J Richardson
JournalJournal of Electrochemical Society
Volume156
A756
Issue9
PaginationA756-A762
KeywordsElectrochemistry, lattice constants, lithium compounds, manganese compounds, solid-state phase transformations, stoichiometry
Abstract

Nonstoichiometry is reported in the LiMnPO4/MnPO4 system. As lithium is removed from crystalline LiMnPO4 by chemical or electrochemical methods, the resulting two-phase mixture consists of stoichiometric LiMnPO4 and a delithiated phase, LiyMnPO4 , whose lattice parameters depend on 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 LiMnPO4 . Attempts to create single-phase solid solutions by heating mixtures of the two phases failed due to the thermal instability of LiyMnPO4.

DOI10.1149/1.3167389