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1. (WO2013161317) METHOD FOR PURIFYING MULTILAYERED CARBON NANOTUBES

Pub. No.:    WO/2013/161317    International Application No.:    PCT/JP2013/002840
Publication Date: Fri Nov 01 00:59:59 CET 2013 International Filing Date: Sat Apr 27 01:59:59 CEST 2013
IPC: C01B 31/02
H01M 4/587
Applicants: SHOWA DENKO K.K.
昭和電工株式会社
Inventors: YAMAMOTO, Ryuji
山本 竜之
NAKAMURA, Takeshi
中村 武志
Title: METHOD FOR PURIFYING MULTILAYERED CARBON NANOTUBES
Abstract:
Purified multilayered carbon nanotubes in which the amount of catalytic metal-derived metallic elements remaining in the multilayered carbon nanotubes is 1,000 to 8,000 ppm by ICP light emission analysis, and in which the amount of acid-derived anions remaining in the multilayered carbon nanotubes is less than 20 ppm by ion chromatography analysis, are obtained by carrying out a method comprising adding multilayered carbon nanotubes synthesized by a gas phase process to an aqueous solution of 0.2 mol/L or more nitric acid, dissolving a catalytic metal that is in the multilayered carbon nanotubes, extracting solid matter by solid-liquid separation, and heat-treating the solid matter at a temperature higher than 150°C.