Controllable Synthesis and Surface Modifications of a Metastable O2-Type Li-Rich Cathode Material
Li-rich materials have become one of the most promising cathode candidates for next-generation lithium-ion battery systems due to their high capacity and operating voltage. Conventional O3-type Li-rich materials undergo a structural transition from a layered to a spinel phase during cycling, leading...
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MDPI AG
2023-07-01
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| Online Access: | https://www.mdpi.com/2073-4352/13/8/1154 |
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| author | Yiming Sun Junjie Huang Hongzhou Zhang Lianqi Zhang Defa Wang |
| author_facet | Yiming Sun Junjie Huang Hongzhou Zhang Lianqi Zhang Defa Wang |
| author_sort | Yiming Sun |
| collection | DOAJ |
| description | Li-rich materials have become one of the most promising cathode candidates for next-generation lithium-ion battery systems due to their high capacity and operating voltage. Conventional O3-type Li-rich materials undergo a structural transition from a layered to a spinel phase during cycling, leading to the degradation in their electrochemical performance, especially in terms of their voltage decay. The oxygen atoms comprising the structure of O2-type Li-rich materials are stacked in the ABAC configuration, which can effectively suppress these harmful phase transitions. However, O2-type Li-rich materials are metastable structures and can only be synthesized via the means of complex ion exchange methods. In addition, the surface of the material is susceptible to side reactions with the electrolyte when charged to high voltages. Here, we explored the optimal conditions for the synthesis of O2-type Li[Li<sub>0.25</sub>Ni<sub>0.1</sub>Co<sub>0.05</sub>Mn<sub>0.6</sub>]O<sub>2</sub> (LLNCM) in more detail by preparing the precursors using the sol-gel method. Meanwhile, the modification of the material’s surface via low-temperature hydrolysis of aluminum isopropoxide has been proposed for the first time in this study to avoid the damage of metastable materials by the high-temperature coating process. The surface-modified materials prepared under optimal conditions exhibited an excellent electrochemical performance, indicating that a highly stable O2-type bulk phase structure with effective surface modification is a potential way to promote the commercial applications of Li-rich cathode materials. |
| first_indexed | 2024-03-11T00:01:28Z |
| format | Article |
| id | doaj.art-94cb7160a82849d1a3d708d4a6718ef3 |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-11T00:01:28Z |
| publishDate | 2023-07-01 |
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| series | Crystals |
| spelling | doaj.art-94cb7160a82849d1a3d708d4a6718ef32023-11-19T00:44:02ZengMDPI AGCrystals2073-43522023-07-01138115410.3390/cryst13081154Controllable Synthesis and Surface Modifications of a Metastable O2-Type Li-Rich Cathode MaterialYiming Sun0Junjie Huang1Hongzhou Zhang2Lianqi Zhang3Defa Wang4School of Materials Science and Engineering, Tianjin University, Tianjin 300350, ChinaSchool of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, ChinaSchool of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, ChinaSchool of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, ChinaSchool of Materials Science and Engineering, Tianjin University, Tianjin 300350, ChinaLi-rich materials have become one of the most promising cathode candidates for next-generation lithium-ion battery systems due to their high capacity and operating voltage. Conventional O3-type Li-rich materials undergo a structural transition from a layered to a spinel phase during cycling, leading to the degradation in their electrochemical performance, especially in terms of their voltage decay. The oxygen atoms comprising the structure of O2-type Li-rich materials are stacked in the ABAC configuration, which can effectively suppress these harmful phase transitions. However, O2-type Li-rich materials are metastable structures and can only be synthesized via the means of complex ion exchange methods. In addition, the surface of the material is susceptible to side reactions with the electrolyte when charged to high voltages. Here, we explored the optimal conditions for the synthesis of O2-type Li[Li<sub>0.25</sub>Ni<sub>0.1</sub>Co<sub>0.05</sub>Mn<sub>0.6</sub>]O<sub>2</sub> (LLNCM) in more detail by preparing the precursors using the sol-gel method. Meanwhile, the modification of the material’s surface via low-temperature hydrolysis of aluminum isopropoxide has been proposed for the first time in this study to avoid the damage of metastable materials by the high-temperature coating process. The surface-modified materials prepared under optimal conditions exhibited an excellent electrochemical performance, indicating that a highly stable O2-type bulk phase structure with effective surface modification is a potential way to promote the commercial applications of Li-rich cathode materials.https://www.mdpi.com/2073-4352/13/8/1154cathode materialO2-typeLi-rich Mn-basedsurface modifiedvoltage decay |
| spellingShingle | Yiming Sun Junjie Huang Hongzhou Zhang Lianqi Zhang Defa Wang Controllable Synthesis and Surface Modifications of a Metastable O2-Type Li-Rich Cathode Material Crystals cathode material O2-type Li-rich Mn-based surface modified voltage decay |
| title | Controllable Synthesis and Surface Modifications of a Metastable O2-Type Li-Rich Cathode Material |
| title_full | Controllable Synthesis and Surface Modifications of a Metastable O2-Type Li-Rich Cathode Material |
| title_fullStr | Controllable Synthesis and Surface Modifications of a Metastable O2-Type Li-Rich Cathode Material |
| title_full_unstemmed | Controllable Synthesis and Surface Modifications of a Metastable O2-Type Li-Rich Cathode Material |
| title_short | Controllable Synthesis and Surface Modifications of a Metastable O2-Type Li-Rich Cathode Material |
| title_sort | controllable synthesis and surface modifications of a metastable o2 type li rich cathode material |
| topic | cathode material O2-type Li-rich Mn-based surface modified voltage decay |
| url | https://www.mdpi.com/2073-4352/13/8/1154 |
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