One-step in situ encapsulation of Ge nanoparticles into porous carbon network with enhanced electron/ion conductivity for lithium storage
| Autor: | Yong-Qing Zhai, Dan Li, Xue-Biao Yang, Xue Qiao, Xian-Ling Wang, Hongqiang Wang, Na Zhang, Ying-Ying Song |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
020502 materials Metals and Alloys chemistry.chemical_element Nanoparticle Germanium 02 engineering and technology Thermal treatment Conductivity Condensed Matter Physics Thermal diffusivity Anode 0205 materials engineering chemistry Chemical engineering Materials Chemistry Lithium Physical and Theoretical Chemistry Template method pattern |
| Zdroj: | Rare Metals. 40:2432-2439 |
| ISSN: | 1867-7185 1001-0521 |
| DOI: | 10.1007/s12598-020-01662-4 |
| Popis: | Germanium (Ge) is considered to be one of the most promising anode materials due to the high theoretical capacity and excellent rate capability. However, its further development is hindered by the poor cycling stability caused by the severe volume change. Herein, we demonstrate a one-step in situ synthesis of Ge nanoparticles embedded into porous carbon framework (PC@Ge) using a facile sacrificial template method via the introduction of poly(methyl methacrylate) and subsequent thermal treatment. This unique nanoarchitecture not only enhances lithium-ion diffusivity and electron conductivity, but also effectively buffers the huge volume expansion and protects the Ge nanoparticles from cracking and aggregation during the cycling. Consequently, the as-prepared PC@Ge electrode exhibits superior capacity retention of 75% and 87% over 1000 cycles at 1.0 and 2.0 A·g−1, respectively. |
| Databáze: | OpenAIRE |
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