Binder-free C@NiCo2O4 on Ni foam with ultra-stable pseudocapacitive lithium ion storage. (31st January 2019)

• Record Type: Journal Article
• Authors: Zhang, Jie; Chu, Ruixia; Chen, Yanli; Jiang, Heng; Zeng, Yibo; Zhang, Ying; Huang, Nay Ming; Guo, Hang
• Is Part Of: Nanotechnology. Volume 30:Number 12(2019)
• Publication Date: 2019-01-31
• Subjects: electrodeposition -- carbon coating -- pseudocapacitance; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/1361-6528/aafa25
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: Carbon-coated nickel cobaltate on nickel foam (C@NCO@NF) with stable pseudocapacitive lithium storage capacity was prepared via a two-step strategy. NiCo hydroxide was initially grown on Ni foam via electrodeposition. Subsequent glucose soaking and annealing converted the intermediate into C@NCO@NF. Carbon coating could significantly improve the cycling stability and rate performance of the binder-free anode. The C@NCO@NF electrode could stably deliver a reversible capacity of 513 mAh · g −1 after 500 cycles at a current density of 500 mA · g −1 . It could even stably cycle at a high current density of 5000 mA · g −1 for 3000 cycles, with a reversible capacity of 115 mAh · g −1 . Kinetic analysis revealed that surface-controlled pseudocapacitance plays a dominant role in the lithium ion storage. Improved electrochemical performance is attributed to the synergetic effect of pseudocapacitance and carbon coating.