PRODUCTION OF MANGANESE DIOXIDE FOR LITHIUM SECONDARY CELL

摘要

PURPOSE:To obtain manganese dioxide for a lithium secondary call capable of drastically increasing the discharge capacity by neutralizing a specified manganese dioxide with a solution containing lithium hydroxide and lithium nitrate and heating. CONSTITUTION:gamma-type manganese dioxide produced by electrolytic method or manganese dioxide produced by chemical synthesis is neutralized with a solution containing lithium hydroxide and lithium nitrate, and then heated to obtain the desired manganese dioxide. The addition amt. of lithium hydroxide in the neutralization process is preferably 10-35 pts.wt. for 100 pts.wt. manganese dioxide, while the addition amt. of lithium nitrate is 50-300 pts.wt. for 100 pts.wt. manganese dioxide. These lithium hydroxide and lithium nitrate are properly diluted to make a mixture solution for use. The process time of neutralization is preferably 1-7 days at 20-80 deg.C.