Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 9, Issue 9, Pages 5740-5750Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta11501k
Keywords
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Funding
- National Natural Science Foundation of China [51671092, 51631004]
- Project of Talent Development in Jilin Province
- Natural Science Foundation of Jilin Province [20200201073JC]
- Graduate Innovation Fund of Jilin University [101832020CX146]
- Program for JLU Science and Technology Innovative Research Team [2017TD-09]
- Fundamental Research Funds for the Central Universities
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In this work, a hybrid of porous Sn nanospheres incorporated in N-doped carbon nanofiber frameworks (Sn/N-CNFs) was fabricated and showed superior cycling stability as a PIB anode, outperforming other Sn-based materials. This excellent performance is attributed to the synergistic effects of porous Sn nanospheres and N-CNFs network, providing sufficient space for volume expansion/contraction of Sn and enhancing electron/ion transport.
Potassium-ion batteries (PIBs) are considered as a promising candidate for large-scale energy storage applications due to the abundant potassium resources. In this work, a hybrid of porous Sn nanospheres incorporated in N-doped carbon nanofiber frameworks (Sn/N-CNFs) was fabricated via electrospinning and a subsequent carbonization process. As a PIB anode, Sn/N-CNFs exhibit superior cycling stability (198.0 mA h g(-1) at 1 A g(-1) after 3000 cycles, and the corresponding capacity retention rate is as high as 88.4%), outperforming other Sn-based materials. Such an excellent performance is ascribed to the synergistic effects of porous Sn nanospheres composed of ultra-small nanoparticles as well as to the unique and interconnected network of N-CNFs, which provide sufficient space for the volume expansion/contraction of Sn, supply efficient electrolyte diffusion paths, offer short K+ diffusion distance, suppress the agglomeration of Sn nanoparticles, enhance the electronic conductivity, and thus facilitate the electron/ion transport.
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