| abstract |
(57) [Summary] (Modified) [PROBLEMS] To provide a novel lithium-ion battery positive electrode material having excellent battery characteristics at low cost. A composition formula LiMn 1-y Fe y O 2 (where 0 < y <0.5), which is a material for a positive electrode of a lithium ion secondary battery substantially composed of an orthorhombic phase, and manufactured by manganese ion (II) and iron After adding and mixing a lithium compound, an oxidizing agent, and an alkali to the solution containing the ion (III), the resultant mixed solution is subjected to a hydrothermal treatment at 400 ° C. or lower to produce the mixed solution. |