Regular hexagonal micron chip capacitor material formed by interwoven NiCoP-CoP porous nanowires and preparation method

Abstract

The invention discloses a method for preparing a novel supercapacitor electrode material. The method comprises steps of using nickel nitrate, cobalt nitrate, ammonium fluoride and urea as raw materials, using a hydrothermal reaction to prepare a Ni-Co precursor formed by interwoven nanowires having a diameter of 80-100 nm, and then phosphatizing the Ni-Co precursor to obtain a material which is aregular hexagonal micron chip (having a side length of about 10[mu]m and a thickness of about 100 nm) formed by interwoven NiCoP-CoP porous (pore size 3 to 5 nm) nanowires. The material has the advantages of high specific surface area and high mechanical stability, ensures high electrochemical performance, and has a specific capacitance retention rate as high as 92% after 10000 cycles of charge and discharge. The preparation method is easy to operate, low in cost, and liable to large-scale production, and has great significance for the design and preparation of nano-micro composite electrode materials.

Description

technical field [0001] The invention relates to a preparation method of an electrode material for a supercapacitor, through hydrothermal reaction and phosphating in a tubular furnace under an inert atmosphere to synthesize regular hexagonal microsheets with excellent electrochemical properties of NiCoP-CoP microporous nanowires interwoven capacitor material. The method does not require any template, is simple to operate, low in cost, good in repeatability, and easy to control. Background technique [0002] With the rapid development of electronic energy devices and hybrid vehicles, batteries and traditional capacitors can no longer meet their needs. Due to the advantages of high power density, fast charge and discharge, and long cycle life, supercapacitors have attracted close attention from the scientific research community and the industry. According to electrode materials, supercapacitors include electric double layer capacitors with carbon materials as electrodes and p...

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Problems solved by technology

[0003] Transition metal hydroxides have good electrochemical activity and have been widely studied for pseudocapacitors. In theory, M(OH) 2 The theoretical specific capacitance of supercapacitors based on pseudocapacitive reactions can reach 1500Fg -1 However, due to the low conductivity of hydroxides, the transport of electrons between active materials is inhibited, so high specific capacitance and excellent rate performance cannot always be achieved.

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