Carbonaceous material for negative electrodes of lithium ion capacitors and method for producing same

摘要

The object of the present invention is to provide a manufacturing method of carbonaceous material for a negative electrode of lithium ion capacitors, wherein the carbonaceous material is obtained from plant-derived char as a source, potassium and iron are sufficiently removed, and an average particle diameter thereof is small; and a carbonaceous material for a negative electrode of lithium ion capacitors.;The object can be solved by a method for manufacturing a carbonaceous material having an average diameter of 3 to 30 μm, for a negative electrode of lithium ion capacitors comprising the steps of: (1) heating plant-derived char having an average particle diameter of 100 to 10000 μm at 500° C. to 1250° C. under an inert gas atmosphere containing a halogen compound to demineralize in a gas-phase, (2) pulverizing a carbon precursor obtained by the demineralization in a gas-phase, (3) calcining the pulverized carbon precursor at less than 1100° C. under a non-oxidizing gas atmosphere.

主权项

1. A method for manufacturing a non-graphitizable carbonaceous material derived from a plant having an average particle diameter of 3 to 30 μm and a specific surface area of 47 to 175 m2/g, for a negative electrode of lithium-ion capacitors comprising the steps of:
(1) heating plant-derived char having an average particle diameter of 100 to 10000 μm at 500° C. to 1250° C. under an inert gas atmosphere containing a chlorine compound to demineralize in the gas-phase, so that an amount of potassium in the resulting carbonaceous material is 0.1 weight % or less, and an amount of iron in the resulting carbonaceous material is 0.02 weight % or less, (2) pulverizing a carbon precursor demineralized in the gas-phase, and (3) heat treating the pulverized carbon precursor at less than 1100° C. under a non-oxidizing gas atmosphere.