Process for producing a positive electrode for lithium secondary batteries
AssigneeVarta Batterie Aktiengesellschaft
InventorGerhard Sterr
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Abstract
An active material for a positive electrode for lithium secondary batteries and composed of a lithium-manganese oxide (Li.sub.x Mn.sub.2 O.sub.4) with a spinel structure is produced by mixing manganese dioxide with lithium formate (HCOOLi) and/or lithium acetate (CH.sub.3 COOLi), heating the resulting mixture for 10 to 100 hours, preferably at a temperature of from 600.degree. C. to 750.degree. C., and if necessary, grinding the heated mixture. The constituents of the mixture contain manganese and lithium in a molar ratio (Mn:Li) of 2:x, where 0.5<x<1.5. The resulting product has an extremely fine crystallinity and exhibits good cycling stability.
Claims6
A process for producing an active material for a positive electrode for lithium secondary batteries, wherein the active material is composed of a lithium-manganese oxide having a spinel structure, and comprising the steps of:
- mixing manganese dioxide with a lithium salt selected from the group consisting of lithium formate, lithium acetate, and combinations thereof, thereby producing a mixture;
- and
- heating the mixture at a temperature of from 600.degree. C. to 750.degree. C. for between 10 and 100 hours;
- wherein the mixture is produced by spray-drying a suspension of the manganese dioxide in an aqueous solution of the lithium salt.
Dependencies are inferred from the claim text.