Positive electrode composition for non-aqueous electrolyte secondary battery, method of manufacturing thereof, and non-aqueous electrolyte secondary battery
A positive electrode composition for a non-aqueous electrolyte secondary battery includes a lithium transition metal composite oxide represented by a formula Li a Ni 1-x-y Co x Mn y M z O 2 , wherein 1.00≦a≦1.50, 0<x≦0.50, 0<y≦0.50, 0.00≦z≦0.02, 0.40≦x+y≦0.70, M is at least one element selected from the group consisting of Zr, Ti, Mg, Ta, Nb and Mo, and a boron compound that at least contains boron and oxygen.
1. A method of manufacturing a positive electrode composition for a non-aqueous electrolyte secondary battery, the method comprising:
calcining a first raw material mixture at a temperature of 700° C. to 1100° C. to obtain a lithium transition metal composite oxide represented by a formula Li a Ni 1-x-y Co x Mn y M z O 2 wherein 1.00≦a≦1.50, 0<x≦0.50, 0<y≦0.50, 0<z≦0.02, 0.40≦x+y≦0.70, M is at least one element selected from the group consisting of Zr, Ti, Mg, Ta, Nb and Mo;
mixing the lithium transition metal composite oxide with a boron compound to obtain a second raw material mixture; and
calcining the second raw material mixture at a temperature not greater than 350° C.
2. The method of manufacturing a positive electrode composition for a non-aqueous electrolyte secondary battery according to claim 1 , wherein the boron compound is at least one compound selected from the group consisting of boron oxide, oxo-acid of boron, and oxo-acid salt of boron.
3. The method of manufacturing a positive electrode composition for a non-aqueous electrolyte secondary battery according to claim 2 , wherein the second raw material mixture is calcined at a temperature of 200° C. to 350° C.
4. The method of manufacturing a positive electrode composition for a non-aqueous electrolyte secondary battery according to claim 2 , wherein the boron compound is present in an amount of 2.0 mol % or less as boron with respect to the lithium metal composite oxide.
5. The method of manufacturing a positive electrode composition for a non-aqueous electrolyte secondary battery according to claim 2 , wherein the boron compound is present in an amount of 1.5 mol % or less as boron with respect to the lithium metal composite oxide.
6. The method of manufacturing a positive electrode composition for a non-aqueous electrolyte secondary battery according to claim 2 , wherein the boron compound is present in an amount of 0.5% to 1.5 mol % as boron with respect to the lithium metal composite oxide.
7. The method of manufacturing a positive electrode composition for a non-aqueous electrolyte secondary battery according to claim 1 , wherein the boron compound is orthoboric acid.
8. The method of manufacturing a positive electrode composition for a non-aqueous electrolyte secondary battery according to claim 7 , wherein the second raw material mixture is calcined at a temperature of 200° C. to 350° C.
9. The method of manufacturing a positive electrode composition for a non-aqueous electrolyte secondary battery according to claim 7 , wherein the boron compound is present in an amount of 2.0 mol % or less as boron with respect to the lithium metal composite oxide.
10. The method of manufacturing a positive electrode composition for a non-aqueous electrolyte secondary battery according to claim 7 , wherein the boron compound is present in an amount of 1.5 mol % or less as boron with respect to the lithium metal composite oxide.
11. The method of manufacturing a positive electrode composition for a non-aqueous electrolyte secondary battery according to claim 7 , wherein the boron compound is present in an amount of 0.5% to 1.5 mol % as boron with respect to the lithium metal composite oxide.
12. The method of manufacturing a positive electrode composition for a non-aqueous electrolyte secondary battery according to claim 1 , wherein the second raw material mixture is calcined at a temperature of 200° C. to 350° C.
13. The method of manufacturing a positive electrode composition for a non-aqueous electrolyte secondary battery according to claim 1 , wherein the boron compound is present in an amount of 2.0 mol % or less as boron with respect to the lithium metal composite oxide.
14. The method of manufacturing a positive electrode composition for a non-aqueous electrolyte secondary battery according to claim 1 , wherein the boron compound is present in an amount of 1.5 mol % or less as boron with respect to the lithium metal composite oxide.
15. The method of manufacturing a positive electrode composition for a non-aqueous electrolyte secondary battery according to claim 1 , wherein the boron compound is present in an amount of 0.5% to 1.5 mol % as boron with respect to the lithium metal composite oxide.