Negative electrode active material for charging device
View Patent ↗To present a carbon material which provides an electrical storage device not only ensuring a high energy density but also realizing a high output and an excellent low temperature performance. A negative electrode active material for an electrical storage device employing an aprotic organic solvent electrolyte solution containing a lithium salt as an electrolytes characterized in that it is made of a carbon material having a specific surface area of from 0.01 to 50 m 2 /g and a total mesopore volume of from 0.005 to 1.0 cc/g, wherein volumes of mesopores having pore diameters of from 100 to 400 Å occupy at least 25% of the total mesopore volume.
1. A negative electrode active material for an electrical storage device, comprising a carbon material having a specific surface area of from 0.01 to 50 m 2 /g and a total mesopore volume of from 0.005 to 0.0093 cc/g,
wherein the carbon material includes mesopores having pore diameters of from 20 to 500 Å, and volumes of mesopores having pore diameters of from 100 to 400 Å occupy at least 25% of the total mesopore volume.
2. The negative electrode active material for an electrical storage device according to claim 1 , wherein the carbon material comprises at least one selected from the group consisting of soft carbon, hard carbon and a polyacene material.
3. The negative electrode active material for an electrical storage device according to claim 1 , wherein the carbon material is one obtained by thermally treating a precursor for the carbon material at a temperature of from 600° C. to 1,500° C. in a presence of a compound comprising at least one transition metal.
4. The negative electrode active material for an electrical storage device according to claim 3 , wherein the at least one transition metal comprises at least one of nickel and iron.
5. A lithium ion secondary battery comprising the negative electrode active material as defined in claim 1 .
6. A lithium ion capacitor comprising the negative electrode active material as defined in claim 1 , further comprising a positive electrode active material capable of reversibly adsorbing or desorbing at least one of lithium ions and anions,
wherein at least one of the negative electrode and the positive electrode is doped with lithium ions so that a positive electrode potential after short-circuiting the positive electrode and the negative electrode becomes at most 2.0 V (vs Li/Li + ).
7. The negative electrode active material for an electrical storage device according to claim 1 , wherein the carbon material comprises the mesopores having pore diameters of from 100 to 400 Å which occupy 30 to 85% of the total mesopore volume.
8. The negative electrode active material for an electrical storage device according to claim 1 , wherein the carbon material has a specific surface area of from 0.1 to 20 m 2 /g.
9. The negative electrode active material for an electrical storage device according to claim 1 , wherein the carbon material has an average particle diameter of from 0.5 to 30 μm.
10. The negative electrode active material for an electrical storage device according to claim 9 , wherein the carbon material has an average particle diameter of from 0.5 to 10 μm.
11. The negative electrode active material for an electrical storage device according to claim 10 , wherein the carbon material has an average particle diameter of from 0.5 to 2 μm.