Improved lithium storage performance by encapsulating silicon in free-standing 3D network structure carbon-based composite membranes as flexible anodes
| Autor: | Wang Yali, Jingli Shi, Cuimin Lu, Chengbiao Wei, Hongfei Peng, Hao Liu, Chang Ma, Lei Zhang, Wenjun Ma |
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| Rok vydání: | 2021 |
| Předmět: |
Battery (electricity)
Materials science Silicon Carbonization Graphene Composite number chemistry.chemical_element Surfaces and Interfaces General Chemistry Condensed Matter Physics Surfaces Coatings and Films law.invention Anode Chemical engineering chemistry law Materials Chemistry Capacity loss Carbon |
| Zdroj: | Surface and Coatings Technology. 423:127606 |
| ISSN: | 0257-8972 |
| DOI: | 10.1016/j.surfcoat.2021.127606 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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