NON-AQUEOUS ELECTROLYTIC SECONDARY BATTERY AND ASSEMBLED BATTERY
A non-aqueous electrolytic secondary battery includes a rolled electrode assembly including a positive electrode, a negative electrode and a separator, the positive electrode and the negative electrode being rolled with the separator sandwiched between the positive and negative electrodes; a non-aqueous electrolytic solution; and a quadrangular battery case accommodating the rolled electrode assembly and the non-aqueous electrolytic solution. The positive electrode includes a positive electrode active material layer containing at least a positive electrode active material and carbon nanotubes as a conductive material. The negative electrode includes a negative electrode active material layer containing a negative electrode active material. Where a void volume per unit area of the negative electrode active material layer is A (cm 3 /cm 2 ) and a void volume per unit area of the positive electrode active material layer is B (cm 3 /cm 2 ), the non-aqueous electrolytic secondary battery satisfies 0.6≤B/A≤1.2.
1 . A non-aqueous electrolytic secondary battery, comprising:
a rolled electrode assembly including a positive electrode, a negative electrode and a separator, the positive electrode and the negative electrode being rolled with the separator being sandwiched between the positive electrode and the negative electrode;
a non-aqueous electrolytic solution; and
a quadrangular battery case accommodating the rolled electrode assembly and the non-aqueous electrolytic solution,
wherein:
the positive electrode includes a positive electrode active material layer containing at least a positive electrode active material and carbon nanotubes as a conductive material,
the negative electrode includes a negative electrode active material layer containing a negative electrode active material, and
where a void volume per unit area of the negative electrode active material layer is A (cm 3 /cm 2 ) and a void volume per unit area of the positive electrode active material layer is B (cm 3 /cm 2 ), the non-aqueous electrolytic secondary battery satisfies 0.6≤B/A≤1.2.
2 . The non-aqueous electrolytic secondary battery according to claim 1 , wherein the separator is porous, and where a void volume per unit area of the separator is C (cm 3 /cm 2 ), the non-aqueous electrolytic secondary battery satisfies 0.6≤B/A≤1.2 and 0.6≤C/A≤0.71.
3 . The non-aqueous electrolytic secondary battery according to claim 2 , wherein:
the void volume A per unit area of the negative electrode active material layer is 0.0014 cm 3 /cm 2 or larger and 0.0016 cm 3 /cm 2 or smaller,
the void volume B per unit area of the positive electrode active material layer is 0.0009 cm 3 /cm 2 or larger and 0.0016 cm 3 /cm 2 or smaller, and
the void volume C per unit area of the separator is 0.0007 cm 3 /cm 2 or larger and 0.0011 cm 3 /cm 2 or smaller.
4 . The non-aqueous electrolytic secondary battery according to claim 1 , wherein where a total weight of the positive electrode active material layer is 100% by weight, the carbon nanotubes are contained in the positive electrode active material layer at a content of 0.5% by weight or higher and 5% by weight or lower.
5 . An assembled battery including a plurality of the non-aqueous electrolytic secondary batteries according to claim 1 , wherein:
the plurality of non-aqueous electrolytic secondary batteries are aligned in a direction, and
the plurality of non-aqueous electrolytic secondary batteries are restrained so as to be supplied with a load in a direction in which the plurality of non-aqueous electrolytic secondary batteries are aligned.