Method of making lithium metal oxide cathode active material

Details Method of making lithium metal oxide cathode active material Method of making lithium metal oxide cathode active material

1993-11-15

1996-05-28

Nuzzolillo, M.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

429192, 429194, 429218, 429224, C01S 3100

Patent

active

055209033

ABSTRACT:
A method of making a composition having lithium, transition metal and oxygen elements and preferably having vanadium as the transition metal with a unit structure of the nominal general formula LiV.sub.3 O.sub.8, such structure being able to accept lithium ions. The method as exemplified by the formation of Li.sub.1+x V.sub.3 O.sub.8 (0.ltoreq.x.ltoreq.0.2) comprises forming a mixture of intermingled particles of vanadium pentoxide (V.sub.2 O.sub.5) and lithium carbonate (Li.sub.2 CO.sub.3) each in an amount sufficient to provide a stoichiometric ratio of approximately 1:3 of lithium to vanadium respectively; compacting the particles by applying a compressive force to the intermingled particles; and heating the intermingled particles to an elevated temperature which is below the melting point of the LiV.sub.3 O.sub.8 product of the invention. The compacting and heating steps consolidate the particles into a densified body and cause diffusion of at least a portion of the elements across particle boundaries with release of carbon dioxide, thereby providing a lithium-vanadium-oxygen composition having a unit structure of Li.sub.1+x V.sub.3 O.sub.8.

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