HIGH VOLTAGE LITHIUM ION POSITIVE ELECTRODE MATERIAL

A positive electrode material having a nominal stoichiometry Li 1+y/2 Co 1-x-y-z-d Si z Fe x M y M' d (PO 4 ) 1+y/2 where M is a trivalent cation selected from at least one of Cr, Ti, Al, Mn, Ni, V, Sc, La and/or Ga, M' is a divalent cation selected from at least one of Mn, Ni, Zn, Sr, Cu,...

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Bibliographische Detailangaben
Hauptverfasser:	Delp III, Samuel A, Allen, Jan L, Allen, Joshua L, Wolfenstine, Jeffery, Jow, T. Richard
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BASIC ELECTRIC ELEMENTS CHEMISTRY COMPOUNDS THEREOF ELECTRICITY INORGANIC CHEMISTRY METALLURGY NON-METALLIC ELEMENTS PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY
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Beschreibung
Zusammenfassung:	A positive electrode material having a nominal stoichiometry Li 1+y/2 Co 1-x-y-z-d Si z Fe x M y M' d (PO 4 ) 1+y/2 where M is a trivalent cation selected from at least one of Cr, Ti, Al, Mn, Ni, V, Sc, La and/or Ga, M' is a divalent cation selected from at least one of Mn, Ni, Zn, Sr, Cu, Ca and/or Mg, y is within a range of 0 < y ¤ 0.10 and x is within a range of 0 ¤ x ¤ 0.2. The use of double compositional modification to LiCoPO 4 increases the discharge capacity from ~100 mAh/g to about 130 mAh/g while retaining the discharge capacity retention of the singly Fesubstituted LiCoPO 4 . Additional compositional modification to include Si increases the cycle life and greatly improved the coulombic efficiency to between 97-100% at a C/3 cycle rate.