| 摘要 |
PURPOSE:To make it possible to obtain a positive electrode active material consisting of manganese lithium oxide generating few crystal lattice defects due to the charge and the discharge by mixing lithium compounds to lower manganese oxide of roasted manganese sulfate and heating and roasting the mixture. CONSTITUTION:A lower manganese oxide mainly composed of Mn2O3 is made by roasting manganese sulfate crystal obtained by heating and condensing a manganese sulfate solution, then lithium compounds are added to the lower manganese oxide, and the mixture is heated and roasted to produce a spinel type lithium manganese oxide as a positive electrode active material. In the crystal structure of this lithium manganese oxide, lattice vacancies in which Li<+> ion can be inserted are connected three dimensionally, so that the insertion or the ejection of lithium ions, the negative electrode active material, into or from the positive electrode active material can be carried out smoothly at the time of the charge and the discharge in a nonaqueous solvent secondary cell. Thereby a positive electrode active material consisting of manganese lithium oxide generating few crystal lattice defects due to the charge and the discharge can be obtained. |
