Carbonaceous material, method for producing the same, electrode active material for electrochemical device, electrode for electrochemical device, and electrochemical device

Abstract

The purpose of the present invention is to provide: a carbonaceous material with which an electrochemical device having a high initial capacitance, a high effect of reducing gas emissions during charging and discharging, and excellent durability can be obtained, and a method for producing the carbonaceous material; an electrode active material for an electrochemical device comprising the carbonaceous material; an electrode for an electrochemical device using the same; and an electrochemical device. The present invention relates to a carbonaceous material that has a BET specific surface area of 1550 to 2500 m2 / g, a value of oxygen content / hydrogen content per specific surface area of 1.00 to 2.10 mg / m2, and a conductivity by powder resistivity measurement at a load of 12 kN of 10 to 15 S / cm.

Claims

1. The BET specific surface area is 1550 to 2500 m ２ / g, and the value of oxygen content / hydrogen content per specific surface area is 1.00 to 2.10 mg / m ２ and the conductivity by powder resistance measurement at a load of 12 kN is 10 to 15 S / cm, a carbonaceous material.

2. The carbonaceous material according to Claim 1, wherein the value of oxygen content / hydrogen content is 2.0 to 4.

3.

3. The carbonaceous material according to Claim 1 or 2, wherein the carbonaceous material is based on a plant-derived carbon precursor.

4. The carbonaceous material according to any one of Claims 1 to 3, wherein the carbon precursor is derived from a coconut shell.

5. A heating step of heating a carbonaceous material precursor at 330°C or higher in an oxidizing gas atmosphere, and a temperature reduction step of reducing the temperature of the carbonaceous material precursor heated at 330°C or higher in the oxidizing gas atmosphere in a non-oxidizing gas atmosphere, when the heating step carried out in the oxidizing gas atmosphere is included once, the temperature reduction step is carried out following the heating step, when the heating step carried out in the oxidizing gas atmosphere is included a plurality of times, the temperature reduction step is carried out at least following the heating step carried out in the final oxidizing gas atmosphere, The method for producing a carbonaceous material according to any one of Claims 1 to 4, wherein the conductivity by powder resistance measurement at a load of 12 kN of the carbonaceous material precursor subjected to the heating step carried out in the final oxidizing gas atmosphere is 11 to 16 S / cm.

6. The method for producing a carbonaceous material according to Claim 5, wherein in the temperature reduction step, the temperature of the carbonaceous material precursor is reduced to 200°C or lower.

7. An electrode active material for an electrochemical device formed from the carbonaceous material according to any one of Claims 1 to 4.

8. An electrode for an electrochemical device containing the electrode active material for an electrochemical device according to Claim 7.

9. An electrochemical device comprising the electrode for an electrochemical device according to Claim 8.

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