Electrode, nonaqueous electrolyte battery and battery pack
According to an embodiment, there is provided an electrode including an active material-containing layer. A logarithmic differential pore volume distribution curve of the active material-containing layer by a mercury intrusion method includes first and second peaks. The first peak is a local maximum value in a range where a pore size is from 0.1 μm or more to 0.5 μm or less. The second peak is a local maximum value in a range where the pore size is from 0.5 μm or more to 1.0 μm or less. An intensity A1 of the first peak and an intensity A2 of the second peak satisfy 0.1≤A2/A1≤0.3. A density of the active material-containing layer is from 2.9 g/cm 3 or more to 3.3 g/cm 3 or less.
1. An electrode comprising:
an active material-containing layer containing active material particles, and
the active material particles containing particles of a lithium-containing nickel-cobalt-manganese composite oxide represented by the following Formula (1):
Li 1-x Ni 1-a-b Co a Mn b O 2 (1)
in the Formula (1), x is in a range of −0.2≤x≤0.5, a is in a range of 0<a≤0.4, and b is in a range of 0<b≤0.4,
a logarithmic differential pore volume distribution curve of the active material-containing layer by a mercury intrusion method includes a first peak and a second peak, the first peak is a local maximum value in a range where a pore size is from 0.1 μm or more to 0.5 μm or less, the second peak is a local maximum value in a range where the pore size is from 0.5 μm or more to 0.8 μm or less and in a range where the pore size is larger than the pore size of the first peak,
an intensity A1 of the first peak and an intensity A2 of the second peak satisfy a relational expression of 0.1≤A2/A1≤0.3, and
a density of the active material-containing layer is from 2.9 g/cm 3 or more to 3.3 g/cm 3 or less.
2. The electrode according to claim 1 , wherein,
in a cumulative pore volume distribution curve of the active material-containing layer by a mercury intrusion method,
a cumulative pore volume V1 in a range where the pore size is front 0.1 μm or more to 0.5 μm or less, and a total pore volume V having an upper limit of 0.2 mL/g satisfy a relational expression of 0.2V1/V≤0.8.
3. The electrode according to claim 2 , wherein a pore specific surface area obtained from the cumulative pore volume distribution curve of the active material-containing layer by the mercury intrusion method is from 2.7 cm 2 /g or more to 3.5 cm 2 /g or less.
4. A nonaqueous electrolyte battery comprising:
the electrode according to claim 1 as a positive electrode;
a negative electrode including a negative electrode active material;
a separator interposed therebetween; and
a nonaqueous electrolyte.
5. A battery pack comprising the nonaqueous electrolyte battery according to claim 4 .