Nonaqueous electrolyte battery and battery pack comprising a spinel type lithium-manganese composite oxide

1. A nonaqueous electrolyte battery comprising:

a positive electrode, the positive electrode comprising a spinel type lithium-manganese composite oxide and a lithium cobalt oxide as a positive electrode active material, the spinel type lithium-manganese composite oxide and the lithium cobalt oxide satisfying formula (1) below;

a negative electrode, the negative electrode comprising a titanium-containing oxide; and

a nonaqueous electrolyte,

the nonaqueous electrolyte battery satisfying formula (2) below:

0.01≤ B /( A+B )<0.05  (1)

0.3≤ C/D≤ 0.8  (2)

where A is a weight ratio (wt %) of the spinel type lithium-manganese composite oxide in the positive electrode active material, B is a weight ratio (wt %) of the lithium cobalt oxide in the positive electrode active material, C is a pore specific surface area (m 2 /g) of the positive electrode according to mercury porosimetry, and D is a pore specific surface area (m 2 /g) of the negative electrode according to mercury porosimetry and a value of the D is within a range of from 5 m 2 /g to 5.45 m 2 /g.

2. The nonaqueous electrolyte battery according to claim 1 , wherein the spinel type lithium-manganese composite oxide is represented by a general formula LiM x Mn 2−x O 4 , where M is at least one element selected from the roup consisting of Mg, Ti, Cr, Fe, Co, Zn, Al, Li and Ga, and x satisfies 0.22≤x≤0.7.

3. The nonaqueous electrolyte battery according to claim 1 , wherein the C/D is within a range of from 0.3 to 0.5.

4. The nonaqueous electrolyte battery according to claim 1 , wherein particles of the spinel type lithium-manganese composite oxide comprise secondary particles.

5. The nonaqueous electrolyte battery according to claim 4 , wherein an average secondary particle size of the particles of the spinel type lithium-manganese composite oxide is from 4 μm to 15 μm.

6. The nonaqueous electrolyte battery according to claim 4 , wherein an average secondary particle size of the particles of the spinel type lithium-manganese composite oxide is 4 μm or greater and less than 10 μm.

7. The nonaqueous electrolyte battery according to claim 1 , wherein a specific surface area of the particles of the spinel type lithium-manganese composite oxide, according to a BET method with N 2 adsorption, is from 0.1 m 2 /g to 1.2 m 2 /g.

8. The nonaqueous electrolyte battery according to claim 1 , wherein a specific surface area of the particles of the spinel type lithium-manganese composite oxide, according to a BET method with N 2 , adsorption, is greater than 0.4 m 2 /g and 1.2 m 2 /g or less.

9. The nonaqueous electrolyte battery according to claim 6 , wherein a specific surface area of the particles of the spinel type lithium-manganese composite oxide, according to a BET method with N 2 adsorption, is greater than 0.4 m 2 /g and 1.2 m 2 /g or less.

10. The nonaqueous electrolyte battery according to claim 1 , wherein the titanium-containing oxide includes at least one selected from the group consisting of lithium-titanium composite oxide, anatase titanium-containing oxide, rutile titanium-containing oxide, bronze titanium-containing oxide, orthorhombic titanium-containing oxide, monoclinic niobium titanium-containing oxide, and a metal composite oxide containing Ti and at least one element selected from the group consisting of P, V, Sn, Cu, Ni, Nb, and Fe.

11. A battery pack comprising one or more of the nonaqueous electrolyte battery according to claim 1 .

12. The nonaqueous electrolyte battery according to claim 1 , wherein

0.01≤ B /( A+B )<0.04  (1), and

0.3≤ C/D≤ 0.8  (2).