Method of manufacturing a non-aqueous electrolyte secondary battery by subjecting sodium magnesium metal oxide to ion-exchange of sodium for lithium
View Patent ↗A method of manufacturing a non-aqueous electrolyte secondary battery by subjecting a sodium-magnesium-containing oxide represented by the general formula Na c Mg b MO 2±a , where 0.65≦c≦0.75, 0<b≦0.3, 0≦a≦03, and M is at least one of manganese and cobalt, to ion-exchange of sodium for lithium by using a molten salt, an aqueous solution, or an organic solvent, to prepare a positive electrode active material.
1. A method of manufacturing a non-aqueous electrolyte secondary battery, comprising:
subjecting a sodium-magnesium-containing oxide represented by the general formula Na c Mg b MO 2±α , where 0.65≦c≦0.75, 0<b≦0.3, 0≦α≦0.3, and M is at least one of manganese and cobalt, to ion-exchange of sodium for lithium by using a molten salt, an aqueous solution, or an organic solvent, to prepare a positive electrode active material;
preparing a positive electrode active material slurry containing the positive electrode active material and a binder, and thereafter applying the positive electrode active material slurry to a positive electrode current collector, to prepare a positive electrode;
interposing a separator between the positive electrode and a negative electrode to prepare a power-generating element; and
encasing the power-generating element in a battery case, and filling an electrolyte solution in the battery case.
2. The method according to claim 1 , wherein the sodium-magnesium-containing oxide is represented by the general formula Na c Mg b Mn x Co y O 2±α where 0.65≦c≦0.75, 0<b≦0.3, 0.45≦x≦0.55, 0.45≦y≦0.55, 0.90≦x+y≦1.10, and 0≦α≦0.3.
3. The method according to claim 1 , wherein the positive electrode active material comprises a lithium-containing oxide active material having a crystal structure belonging to an O2 structure, a T2 structure, an O6 structure, or a mixed structure thereof.
4. The method according to claim 2 , wherein the positive electrode active material comprises a lithium-containing oxide active material having a crystal structure belonging to an O2 structure, a T2 structure, an O6 structure, or a mixed structure thereof.
5. The method according to claim 1 , wherein 0<b≦0.2.
6. The method according to claim 2 , wherein 0<b≦0.2.
7. The method according to claim 3 , wherein 0<b≦0.2.
8. The method according to claim 4 , wherein 0<b≦0.2.