Enhancing the Stability of LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub> by Coating with LiNbO<sub>3</sub> Solid-State Electrolyte: Novel Chemically Activated Coating Process versus Sol-Gel Method
LiNbO<sub>3</sub>-coated LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub> spinel was fabricated by two methods: using hydrogen-peroxide as activating agent and sol-gel method. The structure of the obtained cathode materials was investigated using a scan...
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| Format: | Article |
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MDPI AG
2021-02-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/11/2/548 |
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| author | Valeriu Mereacre Pirmin Stüble Ahmad Ghamlouche Joachim R. Binder |
| author_facet | Valeriu Mereacre Pirmin Stüble Ahmad Ghamlouche Joachim R. Binder |
| author_sort | Valeriu Mereacre |
| collection | DOAJ |
| description | LiNbO<sub>3</sub>-coated LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub> spinel was fabricated by two methods: using hydrogen-peroxide as activating agent and sol-gel method. The structure of the obtained cathode materials was investigated using a scanning electron microscope (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and the electrochemical properties of the prepared cathodes were probed by charge-discharge studies. The morphology of the coating material on the surface and the degree of coverage of the coated particles were investigated by SEM, which showed that the surface of LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub> particles is uniformly encapsulated by lithium innovate coating. The influence of the LiNbO<sub>3</sub> coating layer on the spinel’s properties was explored, including its effect on the crystal structure and electrochemical performance. XRD studies of the obtained coated active materials revealed very small expansion or contraction of the unit cell. From the capacity retention tests a significant improvement of the electrochemical properties resulted when a novel chemically activated coating process was used. Poorer results, however, were obtained using the sol-gel method. The results also revealed that the coated materials by the new method exhibit enhanced reversibility and stability compared to the pristine and reference ones. It was shown that the morphology of the coating material and possible improvement of communication between the substrates play an important role. |
| first_indexed | 2024-03-09T00:38:19Z |
| format | Article |
| id | doaj.art-444ec8b0b8754e2bbda7a0afa097d496 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-09T00:38:19Z |
| publishDate | 2021-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-444ec8b0b8754e2bbda7a0afa097d4962023-12-11T17:58:32ZengMDPI AGNanomaterials2079-49912021-02-0111254810.3390/nano11020548Enhancing the Stability of LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub> by Coating with LiNbO<sub>3</sub> Solid-State Electrolyte: Novel Chemically Activated Coating Process versus Sol-Gel MethodValeriu Mereacre0Pirmin Stüble1Ahmad Ghamlouche2Joachim R. Binder3Institute for Applied Materials, Energy Storage Systems, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, GermanyInstitute for Applied Materials, Energy Storage Systems, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, GermanyInstitute for Applied Materials, Energy Storage Systems, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, GermanyInstitute for Applied Materials, Energy Storage Systems, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, GermanyLiNbO<sub>3</sub>-coated LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub> spinel was fabricated by two methods: using hydrogen-peroxide as activating agent and sol-gel method. The structure of the obtained cathode materials was investigated using a scanning electron microscope (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and the electrochemical properties of the prepared cathodes were probed by charge-discharge studies. The morphology of the coating material on the surface and the degree of coverage of the coated particles were investigated by SEM, which showed that the surface of LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub> particles is uniformly encapsulated by lithium innovate coating. The influence of the LiNbO<sub>3</sub> coating layer on the spinel’s properties was explored, including its effect on the crystal structure and electrochemical performance. XRD studies of the obtained coated active materials revealed very small expansion or contraction of the unit cell. From the capacity retention tests a significant improvement of the electrochemical properties resulted when a novel chemically activated coating process was used. Poorer results, however, were obtained using the sol-gel method. The results also revealed that the coated materials by the new method exhibit enhanced reversibility and stability compared to the pristine and reference ones. It was shown that the morphology of the coating material and possible improvement of communication between the substrates play an important role.https://www.mdpi.com/2079-4991/11/2/548LiNbO<sub>3</sub>X-ray diffractionlithium-ion batteriescathode materialselectrochemical properties |
| spellingShingle | Valeriu Mereacre Pirmin Stüble Ahmad Ghamlouche Joachim R. Binder Enhancing the Stability of LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub> by Coating with LiNbO<sub>3</sub> Solid-State Electrolyte: Novel Chemically Activated Coating Process versus Sol-Gel Method Nanomaterials LiNbO<sub>3</sub> X-ray diffraction lithium-ion batteries cathode materials electrochemical properties |
| title | Enhancing the Stability of LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub> by Coating with LiNbO<sub>3</sub> Solid-State Electrolyte: Novel Chemically Activated Coating Process versus Sol-Gel Method |
| title_full | Enhancing the Stability of LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub> by Coating with LiNbO<sub>3</sub> Solid-State Electrolyte: Novel Chemically Activated Coating Process versus Sol-Gel Method |
| title_fullStr | Enhancing the Stability of LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub> by Coating with LiNbO<sub>3</sub> Solid-State Electrolyte: Novel Chemically Activated Coating Process versus Sol-Gel Method |
| title_full_unstemmed | Enhancing the Stability of LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub> by Coating with LiNbO<sub>3</sub> Solid-State Electrolyte: Novel Chemically Activated Coating Process versus Sol-Gel Method |
| title_short | Enhancing the Stability of LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub> by Coating with LiNbO<sub>3</sub> Solid-State Electrolyte: Novel Chemically Activated Coating Process versus Sol-Gel Method |
| title_sort | enhancing the stability of lini sub 0 5 sub mn sub 1 5 sub o sub 4 sub by coating with linbo sub 3 sub solid state electrolyte novel chemically activated coating process versus sol gel method |
| topic | LiNbO<sub>3</sub> X-ray diffraction lithium-ion batteries cathode materials electrochemical properties |
| url | https://www.mdpi.com/2079-4991/11/2/548 |
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