Electrode for electrical storage element, and nonaqueous lithium electrical storage element
Provided is a non-aqueous lithium-type electrical storage element having both high output and high capacity per volume. The non-aqueous lithium-type electrical storage element relevant to the present invention is a non-aqueous lithium-type electrical storage element having: an electrode body laminated with a positive electrode having a positive electrode active material layer including a positive electrode active material, and a positive electrode current collector, a separator, and a negative electrode having a negative electrode active material layer including a negative electrode active material, and a negative electrode current collector; a non-aqueous electrolytic solution including a lithium ion; and an outer casing.
1. A non-aqueous lithium-type electrical storage element,
having:
an electrode body laminated with
a positive electrode having a positive electrode active material layer including a positive electrode active material, and a positive electrode current collector,
a separator, and
a negative electrode having a negative electrode active material layer including a negative electrode active material, and a negative electrode current collector;
a non-aqueous electrolytic solution including a lithium ion; and
an outer casing;
wherein said positive electrode active material comprises an active material having a BET specific surface area of 3051 m 2 /g or more and less than or equal to 4500 m 2 /g, and having an average particle size of 1 μm to 30 μm, in which mesopore volume V1 (cc/g) derived from a pore having a diameter of 20 Å to 500 Å, calculated by the BJH method, is 0.8<V1≤2.5, and micro-pore volume V2 (cc/g) derived from a pore having a diameter of smaller than 20 Å, calculated by the MP method, is 1.0<V2≤3.0; and said positive electrode active material layer has a bulk density of 0.40 g/cm 3 to 0.70 g/cm 3 .
2. Said non-aqueous lithium-type electrical storage element according to claim 1 , wherein said positive electrode active material is an activated carbon having a BET specific surface area of 3051 m 2 /g to 4000 m 2 /g.
3. Said non-aqueous lithium-type electrical storage element according to claim 1 or 2 , wherein said negative electrode active material comprises a composite porous material, in which mesopore volume Vm1 (cc/g) derived from a pore having a diameter of 20 Å to 500 Å, calculated by the BJH method, is 0.01≤Vm1≤0.20, and micro-pore volume Vm2 (cc/g) derived from a pore of smaller than a diameter 20 Å calculated by the MP method, is 0.01≤Vm2≤0.40.
4. Said non-aqueous lithium-type electrical storage element according to claim 1 or 2 , wherein said negative electrode active material comprises a hard carbon material, in which mesopore volume Vm1 (cc/g) derived from a pore having a diameter of 20 Å to 500 Å, calculated by the BJH method, is 0.001≤Vm1≤0.01, and micro-pore volume Vm2 (cc/g) derived from a pore having a diameter of smaller than 20 Å, calculated by the MP method, is 0.001≤Vm2≤0.01.
5. Said non-aqueous lithium-type electrical storage element according to claim 1 or 2 , wherein the product of capacity per weight of said positive electrode active material layer, and ratio of discharge capacity under high current condition to discharge capacity under low current condition, is 115 or more.
6. An electrode for an electrical storage element, which comprises an active material, having a BET specific surface area of 3051 m 2 /g or more and less than or equal to 4500 m 2 /g, and having an average particle size of 1 μm to 30 μm, in which mesopore volume V1 (cc/g) derived from a pore having a diameter of 20 Å to 500 Å, calculated by the BJH method, is 0.8<V1≤2.5, and micro-pore volume V2 (cc/g) derived from a pore having a diameter of smaller than 20 Å, calculated by the MP method, is 1.0<V2≤3.0; and wherein bulk density of an active material layer, which comprises said active material, is 0.40 g/cm 3 to 0.70 g/cm 3 .