METHOD FOR MANUFACTURING CARBON MATERIAL FOR NEGATIVE ELECTRODE OF POWER STORAGE DEVICE, AND CARBON MATERIAL FOR NEGATIVE ELECTRODE OF POWER STORAGE DEVICE

• Main Authors: UMEMURA MASATOSHI, IDO TAKAHIKO, INAGAKI SHINJI, MURAKI TETSUYA
• Format: Patent
• Language: English; Japanese
• Published: 18.05.2017
• Subjects: BASIC ELECTRIC ELEMENTS; CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES ORLIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE; CHEMISTRY; COMPOUNDS THEREOF; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

PROBLEM TO BE SOLVED: To provide a method for manufacturing a carbon material for a negative electrode of a power storage device, by which the specific surface area is never increased even if the diameter of particles is made smaller in order to lower an electric resistance.SOLUTION: A method for manufacturing a carbon material for a negative electrode of a power storage device comprises: a kneading step for kneading a mixture of a pitch and artificial graphite powder having a 50%-volume cumulative diameter of 1 μm or more but less than 3 μm; an infusibilization step for thermally processing the kneaded mixture at 500°C or under into a thermally processed material; a pulverizing step for pulverizing the thermally processed material into pulverized powder of which artificial graphite particle cores are covered with the pitch; and a sintering step for sintering the pulverized powder into sintered powder.SELECTED DRAWING: Figure 1 【課題】電気抵抗が低くなるように粒子径を細かくしても比表面積が大きくならない蓄電デバイスの負極用炭素材料の製造方法を提供すること。【解決手段】５０％体積累積径が１μｍ以上３μｍ未満の人造黒鉛粉と、ピッチとの混合物を混錬する混錬工程と、上記混錬された混合物を５００℃以下で熱処理し熱処理体を得る不融化工程と、上記熱処理体を粉砕し、人造黒鉛粒子の核がピッチで覆われた粉砕粉を得る粉砕工程と、上記粉砕粉を焼成し焼成粉を得る焼成工程と、からなることを特徴とする蓄電デバイスの負極用炭素材料の製造方法。【選択図】 図１