Research Progress of Amorphous Transition Metal Compounds in the Field of Supercapacitor
As a new type of energy storage device,supercapacitor has broad application prospects due to its advantages of fast charge and discharge,long cycle life and environmental friendliness.Supercapacitors are mainly composed of electrode materials,separators,current collectors,electrolytes and external packaging materials.Among them,the electrode material is the core part of the supercapacitor and is a key factor affecting the performance of the supercapacitor.Based on the structure,electrode materials can be divided into two categories:crystalline and amorphous.Compared with crystalline electrode materials,amorphous electrode materials are widely used in supercapacitors due to their disordered atomic arrangement,high theoretical specific capacity,excellent cycle stability and high charge-discharge rate.In this paper,the syntheses of amorphous transition metal compounds electrode materials(hydroxides,oxides,sulfides and selenides)and their corresponding and electrochemical properties are reviewed,and the future research trends of amorphous electrode materials are prospected.
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