A New Lithium Salt with a Chelate Complex of Phosphorus for Lithium Battery Electrolytes

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Abstract
A new salt, lithium tris[1,2‐benenediolato(2)‐O,O']phosphate, was synthesized and utilized in battery electrolytes for cells. This salt has a hexacoordinated chelate‐type phosphorus anion produced from a pentacoordinated organophosphorus compound as a useful intermediate. It is thermally stable due to the chelating effect with the bidentate ligands of the anion which is a feature distinct from the common battery salt . The thermal decomposition temperature is higher than that of the pentacoordinated intermediate, and the decomposition process is proven to occur in two steps with release of the benzene moiety from the anion. The specific conductivity in an ethylene carbonate‐tetrahydrofuran binary mixture (mole fraction of tetrahydrofuran is 0.7) is somewhat low, which can be explained by their high viscosities based on the large anion size. In spite of the low conductivity, the discharge capacity approaches the theoretical value, and a high energy density is obtained for a cell discharged to a cutoff potential of vs. . ©1999 The Electrochemical Society

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