SYNTHESIS METHOD OF NANO-CHEMICAL MANGANESE DIOXIDE BY RECYCLE PROCESS FOR CATHODE MATERIAL USED IN SECONDARY BATTERY

摘要

The present invention includes producing chemical manganese dioxide seed (seed-MnO_2) by heat-treating manganese carbonate (MnCO_3); pulverizing the seed-MnO_2 into nanochemical manganese dioxide (CMD) whereby the primary particles are nanosized; making the CMD have a more homogenous powder form by acid-treating; and manufacturing primary CMD (CMD1) by homogeneous-crystal-growing the CMD on the surface of the nanochemical manganese dioxide seeds. At this time, by recycling reaction filtrate solution obtained to get the CMD1 powder to use as a reaction mother liquid to manufacture a secondary and a tertiary chemical manganese dioxide (CMD2 and CMD3), the yield of the chemical manganese oxide for the entire reaction process can be improved.