Electrochemical property of hierarchical flower-like α-Ni(OH)2 as an anode material for lithium-ion batteries

• Published in: Solid state ionics Vol. 363; p. 115595
• Main Authors: Yao, Jinhuan, Li, Yanwei, Pan, Guanlin, Jin, Xiuying, Luo, Kang, Le, Shangwang
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.05.2021; Elsevier BV
• Subjects: Anode materials; Anodes; Batteries; Charge transfer; Current density; Diffusion coefficient; Electrochemical analysis; Electrochemical impedance spectroscopy; Electrochemical performances; Electrode materials; Electrodes; Hierarchical structure; Hydroxides; Ion charge; Ion diffusion; Ion storage; Lithium; Lithium-ion batteries; Nickel; Nickel compounds; Nickel hydroxide; Raw materials; Rechargeable batteries; Studies; Transition metals; Lithium-ion batteries; Nickel hydroxide; Electrochemical performances; Anode materials; Hierarchical structure
• ISSN: 0167-2738; 1872-7689
• DOI: 10.1016/j.ssi.2021.115595

Transition metal hydroxides (TMHs) are recently receiving increasing attention as anode materials for lithium-ion batteries (LIBs) because of their merits of high theoretical capacity, low cost, and easy preparation. Herein, hierarchical flower-like α-Ni(OH)2 is synthesized by a facile homogeneous precipitation method with Ni(NO3)2·6H2O and urea as raw materials. When evaluated as an anode material for lithium-ion batteries, the α-Ni(OH)2 delivers a high reversible capacity of 1346 mA h g−1 at a current density of 0.05 A g−1, and gives a reversible capacity of 475 mA h g−1 at a high current density of 5.0 A g−1. It maintains a reversible capacity of 1227 mA h g−1 after 30 cycles at 0.1 A g−1, with a capacity retention of 97.0% compared to the second cycle. The charge storage mechanism and kinetics of the α-Ni(OH)2 are analyzed by sweep voltammetry method and electrochemical impedance spectroscopy. The results demonstrate that the lithium ion storage process in the α-Ni(OH)2 is mainly dominated by pseudocapacitive behavior, which is responsible for the superior rate capability; the charge-transfer resistance of the α-Ni(OH)2 is sensitive to the state of charge; the apparent lithium ion diffusion coefficient of the α-Ni(OH)2 varies in the range of 10−14–10−15 cm2 s−1. •Flower-like α-Ni(OH)2 is prepared by a homogeneous precipitation method.•The α-Ni(OH)2 gives a reversible capacity of 1346 mA h g−1 at 0.05 A g−1.•The α-Ni(OH)2 shows a pseudocapacitive-dominated charge storage property.•The DLi+ of the α-Ni(OH)2 varies in the range of 10−14–10−15 cm2 s−1.