Journal
SURFACE & COATINGS TECHNOLOGY
Volume 423, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2021.127606
Keywords
Carbon-based composite membrane; Nano-silicon; Porous structure; Flexible anode; Lithium-ion battery
Funding
- University of Science and Technology Development Fund Planning Project of Tianjin [2017KJ072]
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The research successfully developed a flexible carbon-based composite membrane embedded with nano-silicon particles and graphene using a simple and high-efficiency method. It possesses a porous 3D network structure to alleviate the volume expansion of nano-silicon, leading to a high reversible capacity and effective utilization rate. After 100 cycles, the composite membrane maintains stable performance with almost no capacity loss and close to 100% Coulombic efficiency, demonstrating excellent reversibility and robust stability.
Carbon-encapsulation is an effective strategy to inhibit the volume expansion and enhance the cycle stability of silicon anode in the lithium-ion battery. However, it is still a big challenge to prepare carbon/silicon composite materials with excellent flexibility using a simple and high-efficient method. Herein, a flexible carbon-based composite membrane embedded with nano-silicon particles and graphene is successfully developed via simple precursor preparation and carbonization processes. The obtained carbon-based composite membrane possesses a porous 3D network structure, which can provide buffer space to alleviate the volume expansion of nano-silicon. Due to the unique architecture, the carbon-based composite membrane presents a high reversible capacity of 1135.7 mA h g(-1) and an effective utilization rate of nano-silicon up to 92.6%. After 100 cycles, the reversible capacity is still maintained at 897.6 mA h g(-1) with a capacity retention rate of 74.2%. Furthermore, after 100 cycles, almost no capacity loss is detected, and the Coulombic efficiency is close to 100%, demonstrating excellent reversibility and robust stability. In summary, this research provides a simple and high-efficiency strategy for the preparation of flexible carbon/silicon composite anodes for lithium-ion batteries.
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