Design and mechanism study of multi-phase materials for cathodes in high-performance supercapacitors. (1st August 2022)

• Record Type: Journal Article
• Authors: Lee, Damin; Choi, Youngjoong; Kim, Min Chang; Ji, Hyejeong; Shin, Heon-Cheol; Kim, Kwang Ho
• Is Part Of: Journal of energy storage. Volume 52:Part A(2022)
• Publication Date: 2022-08-01
• Subjects: Multi-phase electrode -- Carbonate hydroxide -- Pseudocapacitors -- Hydrothermal method -- Supercapacitors; Energy storage -- Periodicals; Energy storage -- Research -- Periodicals; 621.3126
• DOI: 10.1016/j.est.2022.104831
• Languages: English
• ISSNs: 2352-152X

Abstract

Abstract: Binder-free porous multi-phase electrodes were grown on Ni foam substrates using a hydrothermal method. This multi-phase electrode was inspired by high-entropy materials, which constituents with different atomic sizes can be used to fabricate electrodes with a high strength, high hardness, and good corrosion resistance. Owing to their unique microscopic structure, well-organized, independent, nanoscale multi-phase electrodes present high electrical conductivities and good ion transport abilities, rendering them attractive for high-performance energy storage systems. Herein, Ni-Cu-Fe-Co- and Mn-containing multi-phase electrodes were fabricated at different reaction times. Among them, the optimized multi-phase electrode, which was fabricated after 12 h of heating, exhibited a remarkably high specific capacity of 1011 mAh g −1 at a current density of 3 A g −1 . And an excellent cycling stability of 87% after 5000 charge–discharge cycles at a current density of 10 A g −1 . The asymmetric supercapacitor fabricated using the optimized multi-phase composite and graphene as the cathode and anode, respectively, presented a high energy density of 53.2 W h kg −1 and excellent power density of 1302.7 W h kg −1, and could turn on a light-emitting diode. Thus, adjustable high-performance electrodes can be used to develop new energy storage applications. Highlights: The 3D multi-phase electrodes were fabricated. The multi-phase electrodes manufactured via a facile hydrothermal method. The optimized multi-phase electrode has excellent electrochemical characteristics. An asymmetric supercapacitor of the multi-phase electrode turned on the LED light.