Binder-free C@NiCoO on Ni foam with ultra-stable pseudocapacitive lithium ion storage.

Author(s) Zhang, J.; Chu, R.; Chen, Y.; Jiang, H.; Zeng, Y.; Zhang, Y.; Huang, N.Ming; Guo, H.
Journal Nanotechnology
Date Published 2019 Mar 22

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 after 500 cycles at a current density of 500 mA · g. It could even stably cycle at a high current density of 5000 mA · g for 3000 cycles, with a reversible capacity of 115 mAh · g. 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.

DOI 10.1088/1361-6528/aafa25
ISSN 1361-6528
Citation Nanotechnology. 2019;30(12):125402.

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