Halogen-controlled synthesis of nickel hydroxide halide for electrode active materials

LI Weining; ZOU Xuefeng; XIANG Bin

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Halogen-controlled synthesis of nickel hydroxide halide for electrode active materials

LI Weining 1,ZOU Xuefeng 2,XIANG Bin 2 *

1.School of Chemistry and Chemical Engineering, Chongqing University, Chongqing,401331;Guizhou Provincial Key Laboratory of Computational Nano-Material Science, Guizhou Education University, Guiyang 550018;Chemical Process Intensification and Reaction, Chongqing University, Chongqing 400044

*Correspondence author

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Funding: none

Opened online:23 April 2021

Accepted by: none

Citation: LI Weining,ZOU Xuefeng,XIANG Bin.Halogen-controlled synthesis of nickel hydroxide halide for electrode active materials[OL]. [23 April 2021] http://en.paper.edu.cn/en_releasepaper/content/4754602

The performance of the material is closely related to its morphology and composition. In this research, we used halogen anions to control the solvothermal process to synthesize a series of halogen hydroxy nickel and studied their electrochemical performance. We find that halogen anions have a huge impact on morphology, composition and performance of the product. Specially, Ni(OH)Cl is a micro-flower with a large specific surface area composed of ultra-thin nano-sheets. In the three-electrode system, the Ni(OH)Cl electrode exhibits higher specific capacity (142 mAh g-1 at the current densities of 1 A g-1) than other electrodes due to its special morphology and structure. When assembled an asymmetric supercapacitor (Ni(OH)Cl//rGO ASC) by employing nickel hydroxychloride, rGO and 2M KOH aqueous solution as the positive electrode, the negative electrode, and the electrolyte, respectively. The device demonstrated a high energy density of 66 Wh kg?1 at a power density of 800W kg?1 and maintained at an energy density of 35.4 Wh kg?1 even with a high power density of 8000 W kg?1. This research will provide a new idea for controlling the morphology and composition of materials.

Keywords:Nickel hydroxychloride; Halogen anions; Shape-controlled; micro-flower structure; Supercapacitor;

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