| 摘要 |
PROBLEM TO BE SOLVED: To provide lithium manganese spinel oxide particle powder Li4Mn5O12 which can be calcined in a short time, has high crystallinity and is especially useful as a cathode active substance. SOLUTION: This method for producing the lithium manganese spinel oxide particle powder comprises mixing a manganate aqueous solution with one or more equivalents of an oxalic acid aqueous solution to produce the precipitates of manganese oxalate, filtering off the precipitates, washing the precipitates with water, drying the washed precipitates, pyrolyzing the dried precipitates in an oxygen-containing gas at 350 to 500 deg.C to prepare the manganese oxide particle powder, mixing the manganese oxide particle powder with a lithium compound, adding 1 to 10 wt.% of water to the mixed powder, compression- molding the mixture to obtain the molded product having a molding density of >=2 g/cm3, and then calcining the molded product at 350 to 600 deg.C in oxygen of 1 to 5 atm. |
