Crucial role of water content on the electrochemical performance of α-Ni(OH)2 as an anode material for lithium-ion batteries
| Autor: | Jinhuan Yao, Jiqiong Jiang, Renshu Huang, Shunhua Xiao, Yanwei Li, Jianwen Yang |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
General Chemical Engineering General Engineering General Physics and Astronomy chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Thermal diffusivity Electrochemistry 01 natural sciences 0104 chemical sciences Ion Anode Adsorption Chemical engineering chemistry Electrode General Materials Science Lithium 0210 nano-technology Water content |
| Zdroj: | Ionics. 27:65-74 |
| ISSN: | 1862-0760 0947-7047 |
| DOI: | 10.1007/s11581-020-03793-1 |
| Popis: | In this work, we investigate the influence of water content on the lithium storage performance of α-Ni(OH)2 samples prepared by homogeneous precipitation method and subsequent heat treatment at different temperatures. It is found that the adsorbed water in α-Ni(OH)2 has a decisive impact on the cycling stability and rate capability of the electrode; in contrast, the effect of interlayer water contents is not significant. For example, the α-Ni(OH)2 sample with adsorbed water molecules (heat-treated at 100 °C) delivers a reversible specific capacity of 1115 mAh g−1 at 500 mA g−1 after 30 cycles, while the α-Ni(OH)2 sample after removing the adsorbed molecules (heat-treated at 150 °C) gives a capacity of only 516 mAh g−1 under the same measurement condition. EIS and CV analyses reveal that the adsorbed water molecules in α-Ni(OH)2 decrease the electrochemical reaction resistance, increase lithium ion diffusivity, and greatly enhance the pseudocapacitive charge storage behavior, which lead to superior performance in cycle life and rate capability. |
| Databáze: | OpenAIRE |
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