Organic electrolyte capacitor using a mesopore carbon material as a negative electrode
View Patent ↗An organic electrolyte capacitor is provided with a high energy density, a high power and a high capacitance even at −20°. The organic electrolyte capacitor has a high discharge capacity even at a temperature as low as −20° C., while having a high voltage and a high energy density. The structure of the organic electrolyte capacitor includes a positive electrode, a negative electrode, and an electrolyte capable of transporting lithium ions. The positive electrode can reversibly support lithium ions and anions, and the negative electrode can reversibly support the lithium ions by using a mesopored carbon material having a pore volume of 0.10 ml/g or more for a pore diameter of 3 nm or larger.
1. An organic electrolyte capacitor comprising:
a positive electrode,
a negative electrode and
an electrolyte capable of transporting lithium ions,
wherein the negative electrode active material is a mesopored carbon material having a pore volume of 0.10 ml/g or more for pore diameter of 3 nm or larger; and
wherein said lithium ions are preliminarily supported on the negative electrode and/or positive electrode so that the positive electrode potential is 2.0 V (Li/Li+) or lower, when the positive electrode and the negative electrode are short-circuited.
2. The organic electrolyte capacitor according to claim 1 , wherein the mesopored carbon material is one or a mixture of a plurality of members selected from activated carbon, coconut shell coal, coke, charcoal, bamboo coal and resin carbide.
3. The organic electrolyte capacitor according to claim 2 , wherein the resin carbide is a phenol resin carbide, or the resin carbide is a phenol resin.
4. The organic electrolyte capacitor according to claim 1 , wherein the mesopored carbon material is produced by using Ni or Ni compound.
5. The organic electrolyte capacitor according claim 1 , wherein the organic electrolyte capacitor includes a positive electrode current collector and a negative electrode current collector, each of the current collectors has holes penetrating from surface to rear face, and lithium ions are supported by being supplied from lithium opposed to the negative electrode and/or the positive electrode electrochemically to the negative electrode and/or the positive electrode.
6. The organic electrolyte capacitor according claim 5 , wherein the porosity of the electrode current collector is from 10 to 79%.
7. The organic electrolyte capacitor according claim 5 , wherein the porosity of the electrode current collector is from 20 to 60%.
8. The organic electrolyte capacitor according claim 1 , wherein the mesopored carbon material has a pore volume of about from 0.10 to 0.5 ml/g for a pore diameter of 3 nm or larger.
9. The organic electrolyte capacitor according claim 1 , wherein the mesopored carbon material has a pore volume of about from 0.15 to 0.5 ml/g for a pore diameter of 3 nm or larger.
10. The organic electrolyte capacitor according claim 1 , wherein the positive electrode potential is 1.0 V (Li/Li+) or lower upon short-circuiting the positive electrode and the negative electrode.