A Dendritic Nickel Cobalt Sulfide Nanostructure for Alkaline Battery Electrodes

By Wenyao Li, Bingjie Zhang, Runjia Lin, SocMan Ho-Kimura, Guanjie He, Xiying Zhou, Junqing Hu, I. Parkin. 2018

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A uniform dendritic NiCo2S4@NiCo2S4 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.

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/289088e06381a898d438e77e3102e1860ae16d82