Enhanced cycling stability of Mg–F co-modified LiNi 0.6 Co 0.2 Mn 0.2–y Mg y O 2–z F z for lithium-ion batteries
| Autor: | Tangfeng Xie, Liming Luo, Mingliang Yuan, Guan-jie Yan, Qichao Chen, Shican Dai, Fei Chen |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Doping Metals and Alloys chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Geotechnical Engineering and Engineering Geology Condensed Matter Physics Electrochemistry 01 natural sciences Cathode 0104 chemical sciences law.invention Dielectric spectroscopy chemistry Chemical engineering law Electrode Materials Chemistry Lithium 0210 nano-technology Ball mill Faraday efficiency |
| Zdroj: | Transactions of Nonferrous Metals Society of China. 28:1397-1403 |
| ISSN: | 1003-6326 |
| DOI: | 10.1016/s1003-6326(18)64778-8 |
| Popis: | The layered LiNi0.6Co0.2Mn0.2–yMgyO2–zFz (0≤y≤0.12, 0≤z≤0.08) cathode materials were synthesized by combining co-precipitation method and high temperature solid-state reaction, with the help of the ball milling, to investigate the effects of F–Mg doping on LiNi0.6Co0.2Mn0.2O2. Compared with previous studies, this doping treatment provides substantially improved electrochemical performance in terms of initial coulombic efficiency and cycle performance. The LiNi0.6Co0.2Mn0.11Mg0.09O1.96F0.04 electrode delivers an high capacity retention of 98.6% during the first cycle and a discharge capacity of 189.7 mA·h/g (2.8–4.4 V at 0.2C), with the capacity retention of 96.3% after 100 cycles. And electrochemical impedance spectroscopy(EIS) results show that Mg–F co-doping decreases the charge-transfer resistance and enhances the reaction kinetics, which is considered to be the major factor for higher rate performance. It is demonstrated that LiNi0.6Co0.2Mn0.11Mg0.09O1.96F0.04 is a promising cathode material for lithium-ion batteries for excellent electrochemical properties. |
| Databáze: | OpenAIRE |
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