Electrochemical double-layer energy storage cells with high energy density and high power density
First Claim
1. A process for the preparation of a porous carbonaceous material comprising the following stages:
- a) carbonization of wood, preferably of softwood, and advantageously of pine wood, at a temperature of between 500 and 800°
C.;
b) thermal activation of the wood carbon obtained in a thin layer at a temperature of between 800 and 1 100°
C. in the presence of steam and/or of carbon dioxide;
the activated carbon obtained after stage b) exhibiting a volume of mesopores of less than 75% of the total pore volume and a volume of micropores of less than 75% of the total pore volume.
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Abstract
The invention concerns a method for preparing activated carbons based on wood, preferably softwood and in particular pine wood, for making electrodes for energy storage cells, particularly for super-capacitors. Said activated carbons have a volume of mesopores less than 75% of the total pore volume and a volume of micropores less than 57% of the total pore volume. The invention also concerns a method for making an electrode for energy storage cell, comprising the application of such an activated carbon on a support, preferably by coating derived from a slurry. The energy storage cells using said activated carbons advantageously provide a better compromise between energy density and power density.
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Citations
18 Claims
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1. A process for the preparation of a porous carbonaceous material comprising the following stages:
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a) carbonization of wood, preferably of softwood, and advantageously of pine wood, at a temperature of between 500 and 800°
C.;
b) thermal activation of the wood carbon obtained in a thin layer at a temperature of between 800 and 1 100°
C. in the presence of steam and/or of carbon dioxide;
the activated carbon obtained after stage b) exhibiting a volume of mesopores of less than 75% of the total pore volume and a volume of micropores of less than 75% of the total pore volume. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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9. An electrode based on activated carbon comprising activated carbon based on wood exhibiting a volume of mesopores of less than 75% of the total pore volume and a volume of micropores of less than 75% of the total pore volume.
Specification