Simultaneous MgO coating and Mg doping of Na[Ni0.5Mn0.5]O2 cathode: facile and customizable approach to high-voltage sodium-ion batteries
| Autor: | Jang Yeon Hwang, Yang-Kook Sun, Tae Yeon Yu |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Doping chemistry.chemical_element 02 engineering and technology General Chemistry engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Cathode 0104 chemical sciences law.invention Anode chemistry Coating Chemical engineering law Electrode engineering General Materials Science 0210 nano-technology Layer (electronics) Carbon |
| Zdroj: | Journal of Materials Chemistry A. 6:16854-16862 |
| ISSN: | 2050-7496 2050-7488 |
| DOI: | 10.1039/c8ta06551a |
| Popis: | Herein, we report substantially improved high-voltage stability of Na[Ni0.5Mn0.5]O2 as a cathode material due to a surface MgO coating and bulk Mg doping for high-voltage sodium-ion batteries, for the first time. The MgO coating layer effectively suppressed the unfavorable side reactions during cycling while the partial Mg doping into the bulk Ni sites improved the structural stability by moderating the extent of the irreversible multiphase transformation. As a result, the combination of a MgO coating with Mg doping provides enhanced electrochemical performance and structural stability of Na[Ni0.5Mn0.5]O2 within the voltage range of 2.0–4.2 V. The material demonstrated a high specific capacity of 167 mA h g−1 at a 0.1C and excellent cycling stability and rate capability with 60% capacity retention at 10C (vs. the initial capacity at 0.1C). The practical acceptability of the simultaneous MgO coating and Mg doping of the Na[Ni0.5Mn0.5]O2 cathode was obviously verified using scaled-up pouch-type full cells with hard carbon anodes. |
| Databáze: | OpenAIRE |
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