Preparation method of nitrogen-doped carbon nanofiber-loaded nickel cobalt oxide composite electrode material

Abstract

The invention discloses a preparation method of a nitrogen-doped carbon nanofiber-loaded nickel cobalt oxide composite electrode material. Polyaniline / polyacrylonitrile composite nanofiber is prepared through an electrostatic spinning technology; nitrogen-doped carbon nanofiber is obtained after carbonization treatment, and the nitrogen-doped carbon nanofiber has the advantages of high length-diameter ratio, low cost and the like; by lowering the diameter of the nanometer carbon fiber, the specific surface area of the nanometer carbon fiber can be enlarged, so that more contributions can be made for an electrical double-layer capacitor; in addition, by introduction of nitrogen atoms, the conductivity and the stability of the composite material can be improved; by virtue of nitrogen doping, a part of pseudocapacitor can be contributed, so that a supercapacitor assembled by the material can show higher specific capacitance; and the surface of the carbon nanofiber is loaded with NiCo<2>O<4> nanowires by adopting a solvothermal method, so that the composite electrode material has the characteristics of the faradaic pseudocapacitor and the electrical double-layer capacitor, and the overall specific capacitance of the electrode material can be improved.

Description

technical field

[0001] The invention relates to the field of composite electrode materials, in particular to a method for preparing a nitrogen-doped carbon nanofiber loaded nickel cobaltate composite electrode material. Background technique

[0002] Supercapacitors, also known as electrochemical capacitors, have the advantages of high power density and energy density, fast charge and discharge, and long cycle life. Electrochemical capacitors are divided into electric double layer electrochemical capacitors and Faraday pseudocapacitors according to the principle of energy storage. Among them, electric double layer capacitors are mainly made of carbon materials, which have the advantages of excellent electrical conductivity, fast ion diffusion speed, large specific surface area, and high power density, but generally have low specific capacitance. In contrast, transition metal oxides with Faradaic pseudocapacitive properties, such as RuO 2 , MnO 2 , NiO, Co 3 o 4 , CoO, et...