Positive electrode composition for non-aqueous electrolyte secondary battery and method of manufacturing thereof
The present invention provides a positive electrode composition for a non-aqueous electrolyte secondary battery, wherein the composition includes a lithium-transition metal composite oxide represented by the following compositional formula: Li a Ni 1-x-y Co x M 1 y M 2 z Mo α Nb β O 2 wherein 1.00≤a≤1.50, 0.00≤x≤0.50, 0.00≤y≤0.50, 0.000≤z≤0.020, 0.002≤α≤0.020, 0.002≤β≤0.020, and 0.00≤x+y≤0.70, M 1 represents at least one element selected from the group consisting of Mn and Al, and M 2 represents at least one element selected from the group consisting of Zr, Ti, Mg, Ta, and V, and a boron compound including at least boron and oxygen.
1. A positive electrode composition for a non-aqueous electrolyte secondary battery, the composition comprising a lithium-transition metal composite oxide represented by the following formula:
Li a Ni 1-x-y Co x M 1 y M 2 z Mo α Nb β O 2
wherein 1.00≤a≤1.50, 0.00≤x≤0.50, 0.00≤y≤0.50, 0.000≤z≤0.020, 0.002≤α≤0.020, 0.002≤β≤0.020, and 0.00≤x+y≤0.70, M 2 represents at least one element selected from the group consisting of Zr, Ti, Mg, Ta, and V, and a boron compound comprising a calcined product of orthoboric acid or a salt thereof.
2. The positive electrode composition according to claim 1 , wherein an amount of the boron compound is 2.0 mol % or less in terms of boron, based on the mole of the lithium-transition metal composite oxide.
3. The positive electrode composition according to claim 2 , wherein a raw material compound for the boron compound is orthoboric acid.
4. The positive electrode composition according to claim 2 , wherein a calcination temperature employed for obtaining the calcined product is 450° C. or lower.
5. The positive electrode composition according to claim 1 , wherein a raw material compound for the boron compound is orthoboric acid.
6. The positive electrode composition according to claim 1 , wherein a calcination temperature employed for obtaining the calcined product is 450° C. or lower.
7. A positive electrode for use in a non-aqueous electrolyte secondary battery, the positive electrode comprising the positive electrode composition for a non-aqueous electrolyte secondary battery according to claim 1 .
8. A non-aqueous electrolyte secondary battery comprising the positive electrode according to claim 7 , a negative electrode, and a non-aqueous electrolyte.
9. The positive electrode composition according to claim 1 , wherein 0.3≤y≤0.50.
10. The positive electrode composition according to claim 1 , wherein α=0.01 and β=0.005.
11. A method for producing a positive electrode composition for a non-aqueous electrolyte secondary battery, the method comprising:
providing a lithium-transition metal composite oxide represented by the following compositional formula:
Li a Ni 1-x-y Co x M 1 y M 2 z Mo α Nb β O 2
wherein 1.00≤a≤1.50, 0.00≤x≤0.50, 0.00≤y≤0.50, 0.000≤z≤0.020, 0.002≤α≤0.020, 0.002≤β≤0.020, and 0.00≤x+y≤0.70, M 2 represents at least one element selected from the group consisting of Zr, Ti, Mg, Ta, and V;
mixing the provided lithium-transition metal composite oxide with orthoboric acid to obtain a raw material mixture; and
calcining the obtained raw material mixture at a calcination temperature from 200° C. to 400° C.
12. The method according to claim 11 , wherein the calcination for the raw material mixture is conducted at a calcination temperature between 200° C. and 250° C.
13. The method according to claim 11 , wherein 0.3≤y≤0.50.
14. The method according to claim 11 , wherein α=0.01 and β=0.005.