Abstract
Silicon (Si) shows overwhelming promise as the high-capacity anode material of Li-ion batteries with high energy density. However, Si-based anodes are subjected to a limited electrochemical cycling lifetime due to their large volume change. Herein, a honeycomb-like biomass-derived carbon nanosheet framework is reported to encapsulate Si nanoparticles via a facile molten salt templating method. The carbon framework provides sufficient void space for effectively accommodating the large volume expansion of Si upon Li+ insertion. Moreover, the interconnected carbon skeletons afford fast electron/ion transport pathways for improving the reaction kinetics. Consequently, the porous Si/carbon composite could exhibit a high and stable Li storage capacity of 1022 mAh g−1 at 0.2 A g−1 over 100 cycles along with superior rate capability (555 mAh g−1 at 5 A g−1). This study demonstrates an effective structural design strategy for Si-based anodes toward stable lithium energy storage.
Original language | English |
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Article number | 2100107 |
Journal | Particle and Particle Systems Characterization |
Volume | 38 |
Issue number | 9 |
DOIs | |
State | Published - Sep 2021 |
Keywords
- anodes
- Li-ion batteries
- long lifetime
- molten salt templating
- Si/carbon