Mg-doped Li1.2Mn0.54Ni0.13Co0.13O2 nano flakes with improved electrochemical performance for lithium-ion battery application
| Autor: | Ying Xie, Guo-Hui Tian, Ting-Feng Yi, Shan-Shan Fan, Qianyu Zhang, Hai-Tao Yu, Ming Lou, Yan-Rong Zhu |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Mechanical Engineering Doping Metals and Alloys chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Cathode Lithium-ion battery 0104 chemical sciences law.invention Dielectric spectroscopy chemistry Chemical engineering Mechanics of Materials law Nano Materials Chemistry Lithium Molten salt 0210 nano-technology |
| Zdroj: | Journal of Alloys and Compounds. 739:607-615 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2017.12.286 |
| Popis: | Mg-doped Li1.2-xMgxMn0.54Ni0.13Co0.13O2 cathode materials were prepared by a molten salt method. Our results showed that the introduction of NaCl is rather important and will provide a fusion environment, which not only leads to an evenly distribution of the transition metals within the cathode materials but is also helpful for the formation of a unique two dimensional (2D) nano structures. Mg doping results in a structural variation of the cathode materials, leading to a continuous increase of the capacity at the first dozen cycles. Although Mg doping can significantly improve the rate capability, the cycling stability, and the capacity retention of the cathode materials, a large Mg doping amount (>6%) will cause the formation of impurity phases, which in turn reduce the electrochemical performance of the materials. Electrochemical impedance spectroscopy (EIS) measurement showed that the charge transfer resistance was reduced significantly due to Mg doping, and 4% Mg-doped sample exhibits promising lithium diffusion kinetics and rate capability. |
| Databáze: | OpenAIRE |
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