Electrochemical property of hierarchical flower-like α-Ni(OH)2 as an anode material for lithium-ion batteries
| Autor: | Kang Luo, Jinhuan Yao, Shangwang Le, Xiuying Jin, Guanlin Pan, Yanwei Li |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrochemistry 01 natural sciences 0104 chemical sciences Ion Anode Dielectric spectroscopy Transition metal Chemical engineering chemistry General Materials Science Lithium 0210 nano-technology Voltammetry Current density |
| Zdroj: | Solid State Ionics. 363:115595 |
| ISSN: | 0167-2738 |
| DOI: | 10.1016/j.ssi.2021.115595 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect