期刊
RARE METALS
卷 40, 期 9, 页码 2432-2439出版社
NONFERROUS METALS SOC CHINA
DOI: 10.1007/s12598-020-01662-4
关键词
Lithium-ion batteries; Germanium nanoparticle; In situ synthesis; Porous carbon frameworks; Lithium-ion diffusivity
资金
- National Natural Science Foundation of China [51702079]
- National Natural Science Foundation of Hebei Province [B2020201071]
- Hebei Province Foundation for Returnees [C20190502]
- Science and Technology Project of Hebei Education Department [BJ2018051]
- Post-graduate's Innovation Fund Project of Hebei University [hbu2020ss066]
The PC@Ge electrode prepared by a facile in situ synthesis method demonstrates excellent cycling stability and capacity retention, showing promise for application in the field of lithium-ion batteries.
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. Graphic abstract
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