Li, W; Zhang, B; Lin, R; Ho-Kimura, S; He, G; Zhou, X; Hu, J; Li, W; Zhang, B; Lin, R; Ho-Kimura, S; He, G; Zhou, X; Hu, J; Parkin, IP; - view fewer (2018) A Dendritic Nickel Cobalt Sulfide Nanostructure for Alkaline Battery Electrodes. Advanced Functional Materials 10.1002/adfm.201705937. (In press).

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Abstract

A uniform dendritic NiCo 2 S 4 at NiCo 2 S 4 hierarchical nanostructure of width ≈100 nm is successfully designed and synthesized. From kinetic analysis of the electrochemical reactions, those electrodes function in rechargeable alkaline batteries (RABs). The dendritic structure exhibited by the electrodes has a high discharge-specific capacity of 4.43 mAh cm -2 at a high current density of 240 mA cm -2 with a good rate capability of 70.1% after increasing the current densities from 40 to 240 mA cm -2 . At low scan rate of 0.5 mV s -1 in cyclic voltammetry test, the semidiffusion controlled electrochemical reaction contributes ≈92% of the total capacity, this value decreases to ≈43% at a high scan rate of 20 mV s -1 . These results enable a detailed analysis of the reaction mechanism for RABs and suggest design concepts for new electrode materials.

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