MANGANESE DIOXIDE FOR A LITHIUM BATTERY CATHODE

摘要

The invention relates to chemical batteries, in particular to chemical batteries provided with a lithium cathode and a nonaqueous electrolyte, therein a manganese dioxide is used in the form of an active cathodic agent. Said manganese dioxide is obtainable by oxidising a manganese nitrate by a sodium chlorate in a nitric acid associated with heating, subsequent separation of a product from a reaction medium and heat processing. The concentration of the nitric acid is modified from 38-44 % at the beginning of synthesis to 23-26 % at the end thereof. The content of the thus produced manganese dioxide is equal to 94-96 %, a bulk density thereof ranges from 2.5 to 2.9 kg/dm<3>, the particle size distribution ranges from 1-3 to 60-70 mkm, and the electric conductivity is equal to or greater than 3.4 S/m. The inventive active cathode material exhibits a high cycling capacity in regular conditions, thereby making it possible to use said material for lithium batteries.