Exploring the Effect of a MnO<sub>2</sub> Coating on the Electrochemical Performance of a Li<sub>1.2</sub>Mn<sub>0.54</sub>Ni<sub>0.13</sub>Co<sub>0.13</sub>O<sub>2</sub> Cathode Material
The effect of electrochemically active MnO<sub>2</sub> as a coating material on the electrochemical properties of a Li<sub>1.2</sub>Mn<sub>0.54</sub>Ni<sub>0.13</sub>Co<sub>0.13</sub>O<sub>2</sub> (LTMO) cathode material is expl...
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| Autores principales: | , , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/f0ae4bfc911948aaa00aaca76f87194f |
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| Sumario: | The effect of electrochemically active MnO<sub>2</sub> as a coating material on the electrochemical properties of a Li<sub>1.2</sub>Mn<sub>0.54</sub>Ni<sub>0.13</sub>Co<sub>0.13</sub>O<sub>2</sub> (LTMO) cathode material is explored in this article. The structural analysis indicated that the layered structure of the LTMO was unchanged after the modification with MnO<sub>2</sub>. The morphology inspection demonstrated that the rod-like LTMO particles were encapsulated by a compact coating layer. The MnO<sub>2</sub> layer was able to hinder the electrolyte solution from corroding the LTMO particles and optimized the formation of a solid electrolyte interface (SEI). Meanwhile, lithium ions were reversibly inserted into and extracted from MnO<sub>2</sub>, which afforded an additional capacity. Compared with the bare LTMO, the MnO<sub>2</sub>-coated sample exhibited enhanced electrochemical performance. After the MnO<sub>2</sub> coating, the first discharge capacity rose from 224.2 to 239.1 mAh/g, and the initial irreversible capacity loss declined from 78.2 to 46.0 mAh/g. Meanwhile, the cyclic retention climbed up to 88.2% after 100 cycles at 0.5 C, which was more competitive than that of the bare LTMO with a value of 71.1%. When discharging at a high current density of 2 C, the capacity increased from 100.5 to 136.9 mAh/g after the modification. These investigations may be conducive to the practical application of LTMO in prospective automotive Li-ion batteries. |
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