Patent ID: 8845950
Filing Date: 2014-09-30
Classification: B82Y,C02F,C04B,D01D,D01F,H01M,Y02E,Y10S

Abstract:
1. A method to manufacture a carbon fiber electrode comprising: synthesizing polyamic acid (PAA) as a polyimide (PI) precursor from pryomellitic dianhydride (PMDA) and oxydianiline (ODA) as monomers and triethylamine (TEA) as a catalyst; adding dimethylformamide (DMF) to the polyamic acid (PAA) solution to prepare a spinning solution and subjecting the spinning solution to electrostatic spinning at a high voltage to obtain a PAA nanofiber paper; converting the PAA nanofiber paper into a polyimide (PI) nanofiber paper by heating; converting the polyimide (PI) nanofiber paper into a carbon nanofiber (CNF) paper by heating under an Ar atmosphere and activating to obtain the carbon fiber electrode; and applying a base-treatment to activate the CNF paper to increase a surface area of the CNF paper and control the distribution of pores in the CNF paper; subjecting the CNF paper repeatedly to an acid-treatment and heat-treatment to distribute mesopores in the size of 2 to 50 nm into the CNF paper; wherein applying a base-treatment to activate CNF paper comprises heating at a CNF to base ratio of about 1:2 to about 1:4 in a first heating stage at a first temperature and in a second heating stage heating the resulting material at a second temperature.