Controllable self-assembled mesoporous silicon nanocrystals framework as anode material for Li-ion battery

Yao, Ran-Ran; Xie, Lei; Wu, Yaqian; Meng, Wenjie; He, Yanjun; Zhao, Dongyuan

doi:10.1016/j.electacta.2021.138850

Cited by 8 publications

(4 citation statements)

References 72 publications

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“…Although the by-products Mg 2 Si and MgO produced in the reduction reaction can be removed via hydrochloric acid immersion and other methods, the obtained Si will agglomerate together in this process, resulting in a certain impact on its electrochemical properties. The "liquid" environment provided by sodium chloride during the reduction process is good for preventing the agglomeration of silicon [28]. During the pyrolysis process, melamine is thermally condensed to generate a graphitic carbon nitride (g-C 3 N 4 ) layer.…”

Section: Resultsmentioning

confidence: 99%

“…This study proposes a simple and environmentally friendly approach to fabricate Si@C-CNTs/CS, a high-performance anode material for lithium-ion batteries (LIBs), using the modified extensible magnesium thermal reduction method [27] coupled with a pyrolysis of melamine strategy [28]. The double-layer carbon mesh structure containing carbon nanotubes and carbon sheets not only improves electrical conductivity, but also provides mechanical flexibility and a rich pore structure, which can help to alleviate the expansion of volume during the cycling processes.…”

Section: Introductionmentioning

confidence: 99%

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Silicon/Carbon Nanoparticles Assembled with Multifunction Carbon Nanotubes/Sheets as High-Performance Anode of Lithium-Ion Batteries

Yang,

Li,

et al. 2023

Batteries

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Silicon as an electrode material in the lithium-ion battery application scenario has been hindered by its significant volumetric expansion and intricate synthesis processes. In this research, we have successfully synthesized Si@C/carbon nanotubes/carbon sheets (Si@C-CNTs/CS) composites by employing a simple one-pot method along with modified magnesium thermal reaction, which involves melamine to prevent high temperature. The resulting multifunctional Si@C-CNTs/CS composites demonstrate enhanced stability during volume change in silicon, resulting in both higher capacity compared to conventional carbon coating layer and improved conductivity of the materials. The results indicate that the Si@C-CNTs/CS composites exhibit a high discharge-specific capacity of up to 2981.64 mAh g−1 at 0.5 A g−1 current density and retain a discharge-specific capacity of 1487.71 mAh g−1 even after 300 cycles. Therefore, the double-layer carbon network structure of carbon nanotubes/carbon nanosheets can provide an efficient and simple preparation method for high-performance Si-base anode materials in practical applications.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Silicon/Carbon Nanoparticles Assembled with Multifunction Carbon Nanotubes/Sheets as High-Performance Anode of Lithium-Ion Batteries

Yang,

Li,

et al. 2023

Batteries

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“…The PSi@SPCF electrode exhibits smaller R ct values (102.05 Ω) compared with Si@PCF (135.31 Ω) (Table S2), demonstrating a lower diffusion barrier. This is because (1) the porous structure of Si shortens the Li + diffusion distance and facilitates ion transport and (2) S atom doping enhances the conductivity of carbon fiber and provides more active sites for Li + adsorption. , …”

Section: Resultsmentioning

confidence: 99%

Freestanding Porous Silicon@Heteroatom-Doped Porous Carbon Fiber Anodes for High-Performance Lithium-Ion Batteries

Wang

Yuan

Liu

et al. 2022

ACS Appl. Energy Mater.

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Silicon suffers from high volume variation and poor conductivity, which limits its commercial application in lithium-ion battery anode materials. To improve the stability of Si-based electrodes, the porous structure was designed for both Si and carbon fiber. Furthermore, heteroatom doping was adopted to enhance the conductivity of carbon fiber. Three freestanding porous silicon@heteroatom-doped porous carbon fiber was successfully prepared by coaxial electrospinning. The impact of sulfur/boron doping on the electrochemical properties of anodic materials is systematically researched. The porous structure of both silicon and carbon fiber efficiently relieves the volume expansion of silicon and provides diffusion channels for ion transportation, while the S doping can increase active sites. Relying on the distinctive structure, the porous silicon@sulfur-doped porous carbon fiber (PSi@ SPCF) exhibits virtually the highest reversible capacities over the reported silicon@carbon fiber composites, with an excellent reversible capacity of 1112.7 mAh•g −1 after 1000 cycles at 2.0 A•g −1 , indicating the potential application of the PSi@SPCF composites in advanced energy storage.

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“…To effectively achieve the goal of high energy density for composite electrodes, a strategy has been proposed for assembling silicon‐based nanomaterials into micron‐sized hierarchical structures. [ 21 , 22 , 23 , 24 ] Assembly is a behavior in which basic structural units (molecules, nano materials, micron materials, etc) form a stable hierarchical architecture with regular geometric appearance based on the interaction of non‐covalent bonds. [ 25 , 26 , 27 ] The assembly can significantly enhance the comprehensive properties of the material compared with the primary structural units, thus the assembly strategy is widely used in the fields of optoelectronics, biological medicine, catalysis, energy storage and so on.…”

Section: Introductionmentioning

confidence: 99%

Assembly: A Key Enabler for the Construction of Superior Silicon‐Based Anodes

et al. 2022

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Silicon (Si) is regarded as the most promising anode material for high-energy lithium-ion batteries (LIBs) due to its high theoretical capacity, and low working potential. However, the large volume variation during the continuous lithiation/delithiation processes easily leads to structural damage and serious side reactions. To overcome the resultant rapid specific capacity decay, the nanocrystallization and compound strategies are proposed to construct hierarchically assembled structures with different morphologies and functions, which develop novel energy storage devices at nano/micro scale. The introduction of assembly strategies in the preparation process of silicon-based materials can integrate the advantages of both nanoscale and microstructures, which significantly enhance the comprehensive performance of the prepared silicon-based assemblies. Unfortunately, the summary and understanding of assembly are still lacking. In this review, the understanding of assembly is deepened in terms of driving forces, methods, influencing factors and advantages. The recent research progress of silicon-based assembled anodes and the mechanism of the functional advantages for assembled structures are reviewed from the aspects of spatial confinement, layered construction, fasciculate structure assembly, superparticles, and interconnected assembly strategies. Various feasible strategies for structural assembly and performance improvement are pointed out. Finally, the challenges and integrated improvement strategies for assembled silicon-based anodes are summarized.

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Controllable self-assembled mesoporous silicon nanocrystals framework as anode material for Li-ion battery

Cited by 8 publications

References 72 publications

Silicon/Carbon Nanoparticles Assembled with Multifunction Carbon Nanotubes/Sheets as High-Performance Anode of Lithium-Ion Batteries

Silicon/Carbon Nanoparticles Assembled with Multifunction Carbon Nanotubes/Sheets as High-Performance Anode of Lithium-Ion Batteries

Freestanding Porous Silicon@Heteroatom-Doped Porous Carbon Fiber Anodes for High-Performance Lithium-Ion Batteries

Assembly: A Key Enabler for the Construction of Superior Silicon‐Based Anodes

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