LITHIUM MANGANESE OXIDE FINE POWDER, PRODUCTION LITHIUM MANGANESE FINE POWDER, AND LITHIUM ION SECONDARY BATTERY EMPLOYING POSITIVE ELECTRODE CONTAINING LITHIUM MANGANESE FINE POWDER AS ACTIVE MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a lithium manganese oxide having uniform and fine particle size and structure and capable of increasing the capacity of a positive electrode in the case it is used as a positive electrode active material of a lithium ion secondary battery. SOLUTION: This lithium manganese oxide fine powder has a formula Lix Mn2 O4 (x is 1-1.05) and an octahedral powder particle shape and this lithium ion secondary battery comprises a positive electrode containing the powder as a positive electrode active material. The production method of the powder having the octahedral powder particle shape includes processes of; dissolving lithium acetate and manganese acetate in a solvent; forming a gel by adding gelatin to the resultant solution and removing the solvent; forming a lithium manganese oxide powder by calcining the gel at 300-500 deg.C; pulverizing the powder; sintering the resultant powder at 750-850 deg.C for 6-12 hours; and cooling the sintered product. Consequently, a lithium ion secondary battery comprising a positive electrode containing the powder as the active material enhances capacity and highly efficient charge and discharge property and is applicable to a widened range of application fields.