The Research Of Nickel Based Pseudacapacitor Material As Electrode Material For Supercapacitor

Supercapacitor,as a new type of energy storage device,has many advantages.The energy density is higher than the traditional capacitor,and it has a higher power density and longer cycle life than the battery.The electrode material is the most important component in the device.The specific capacitance of the electrode material will directly affect the electrochemical performance of the whole device.The capacitance value depends on the microstructure and morphology of the electrode material.In this paper,?-Ni?OH?₂ electrode material with good electrochemical properties was prepared by hydrothermal deposition.The?-Ni?OH?₂ materials is modified by introducing anion and cation to enhance the capacitance value of?-Ni?OH?₂ materials.The effects of anion and cation on the structure,morphology and electrochemical properties of?-Ni?OH?₂ electrode materials were systematically studied.Modified?-Ni?OH?₂ as a positive material,and active carbon as a negative material,assembly into asymmetrical supercapacitor.The specific research contents are as follows:?1?Introduction the F^-ions,theF^-ions have the maximum electronegativity and selective adsorbability,which can be adsorbed on the crystal surface ofnanocrystall-ine of the?-Ni?OH?_2,So that?-Ni?OH?₂ grows along the?003??006?hexagonal plane.After adjusting,the morphology of the?-Ni?OH?₂ electrode is six side lamella structure,and it shows superior pseudocapacitance characteristics.The specific capacitance of?-Ni?OH?₂ after the introduction of fluorine ionscan reach 2928 F·g^-1 at1 A·g^-1.?2?Introduction the Co²⁺ions,because Ni and Co are elements in fourth periodthereforethe valence and radius of the ions are all similar,so that the doping of Co²⁺can be replaced in the?-Ni?OH?_2,Moreover,the electronegativity of Co²⁺is smaller than that of Ni²⁺,which is easier to gain loss of electrons and more prone to charge storage.After doping of Co²⁺makes it possible to produce a new nanostructure in the original lamellar structure,thus enhancing the capacitance of the alpha type?-Ni?OH?₂ The specific capacitance of?-Ni?OH?₂ after the introduction of Co²⁺ionscan reach 2879.8 F·g^-1 at 1 A·g^-1.