| 摘要 |
PROBLEM TO BE SOLVED: To provide a producing method of lithium manganese multiple oxide for a positive electrode of a cell to constitutes a lithium secondary cell having high operational voltage and excellent stability for changing and discharging cycles. SOLUTION: Carbon dioxide is blown into a solvent containing lithium compds. and manganese compds., or lithium compds., manganese compds. and substitute elements M (M is selected from B, Mg, Al, Ca, Ti, V, Cr, Fe, Co, Ni, Cu, Zn, Ba, Ga and Ta) to precipitate carbonates containing lithium carbonate. Then, the solvent is filtered or evaporated and dried to obtain a solid material. The solid material is calcined to synthesize crystalline lithium manganate. By using a mixture solvent of 2-4C alcohol and water, fine cabonates are precipitated. By controlling the molar ratio of Li2CO3/(LiOH+Li2CO3) to 0.25-0.75 in the solid material obtd. by filtration or evaporation and drying, the obtd. material has excellent characteristics for changing and discharging cycles. |
