Building ultraconformal protective layers on both secondary and primary particles of layered lithium transition metal oxide cathodes
| Autor: | Minhua Shao, Jiadong Li, Xinwei Zhou, Gui-Liang Xu, Han Gao, Xiang Liu, Qiang Liu, Yang Ren, Zonghai Chen, Feng Pan, Khalil Amine, Kenneth K. S. Lau, Yuzi Liu, Guohua Chen, Minghao Zhuang, Minggao Ouyang |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology Chemical vapor deposition engineering.material 010402 general chemistry 01 natural sciences law.invention Transition metal law Thermal stability Conductive polymer Renewable Energy Sustainability and the Environment Spinel 021001 nanoscience & nanotechnology Cathode 0104 chemical sciences Electronic Optical and Magnetic Materials Fuel Technology chemistry Chemical engineering engineering Particle Lithium 0210 nano-technology |
| Zdroj: | Nature Energy. 4:484-494 |
| ISSN: | 2058-7546 |
| DOI: | 10.1038/s41560-019-0387-1 |
| Popis: | Despite their relatively high capacity, layered lithium transition metal oxides suffer from crystal and interfacial structural instability under aggressive electrochemical and thermal driving forces, leading to rapid performance degradation and severe safety concerns. Here we report a transformative approach using an oxidative chemical vapour deposition technique to build a protective conductive polymer (poly(3,4-ethylenedioxythiophene)) skin on layered oxide cathode materials. The ultraconformal poly(3,4-ethylenedioxythiophene) skin facilitates the transport of lithium ions and electrons, significantly suppresses the undesired layered to spinel/rock-salt phase transformation and the associated oxygen loss, mitigates intergranular and intragranular mechanical cracking, and effectively stabilizes the cathode–electrolyte interface. This approach remarkably enhances the capacity and thermal stability under high-voltage operation. Building a protective skin at both secondary and primary particle levels of layered oxides offers a promising design strategy for Ni-rich cathodes towards high-energy, long-life and safe lithium-ion batteries. Intensive research efforts are underway to enable applications of layered lithium transition metal oxides in batteries. Here the authors report an oxidative chemical vapour deposition technique to conformally coat both the primary and the secondary particles of these oxides to unleash potential applications. |
| Databáze: | OpenAIRE |
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