Nonaqueous electrolyte battery, and battery pack
A nonaqueous electrolyte battery includes a container member, a positive electrode stored in the container member, a negative electrode stored in the container member, and a nonaqueous electrolyte stored in the container member. A gas composition in the container member satisfies, when a charge ratio of the nonaqueous electrolyte battery is set to 30% and the nonaqueous electrolyte battery is left stand at 35° C. for 24 hrs, 0.02 (cc/g)≤ V H2 ≤0.1 (cc/g) (1) 0.05≤ V C3H6 /V CO ≤0.1 (2) 1≤ V CO /V H2 ≤9 (3).
1. A nonaqueous electrolyte battery comprising:
a container member;
a positive electrode stored in the container member and containing, as a positive electrode active material, a lithium containing nickel cobalt manganese composite oxide represented by Li 1−x Ni 1−a−b Co a Mn b O 2 (that satisfies −0.2≤x≤0.5, 0<a≤0.5, and 0<b≤0.5);
a negative electrode stored in the container member, and comprising a negative electrode current collector and a negative electrode mixture layer formed on the negative electrode current collector,
wherein the negative electrode mixture layer contains a lithium titanium composite oxide having a spinel structure as a negative electrode active material; and
a nonaqueous electrolyte stored in the container member, and comprising a propylene carbonate as a solvent,
wherein a specific surface area of the negative electrode measured by the BET method with N 2 absorption falls within a range of 2.5 m 2 /g (inclusive) to 20 m 2 /g (inclusive), and a weight of the negative electrode is a weight of the negative electrode mixture layer,
a specific surface area (PE S ) of the positive electrode and the specific surface area (NE S ) of the negative electrode satisfy a relation given by
0≤|(NE S −PE S )/NE S |≤0.5 (A), and
wherein a gas composition in the container member when a charge ratio of the nonaqueous electrolyte battery is set to 30%, and the nonaqueous electrolyte battery is left stand at 35° C. for 24 hrs satisfies
0.02 (cc/g)≤ V II2 ≤0.1 (cc/g) (1)
0.05≤ V C3H6 /V CO ≤0.1 (2)
1≤ V CO /V H2 ≤9 (3)
where V H2 is a hydrogen gas amount (cc) per 1 g of the negative electrode mixture layer, V C3H6 is a propylene gas amount (cc) per 1 g of the negative electrode mixture layer, and V CO is a carbon monoxide gas amount (cc) per 1 g of the negative electrode mixture laver.
2. The nonaqueous electrolyte battery according to claim 1 , wherein the solvent further comprises one type of chain carbonates or two or more types of chain carbonates.
3. The nonaqueous electrolyte battery according to claim 1 , wherein the specific surface area of the positive electrode measured by the BET method with N 2 absorption falls within a range of 2.5 m 2 /g (inclusive) to 25 m 2 /g (inclusive), and a weight of the positive electrode is a weight of a positive electrode mixture layer.
4. A battery pack including one or two or more the nonaqueous electrolyte battery according to claim 1 .