A study on carbon coating to silicon and electrochemical characteristics of Si-C/Li cells

Yun, Mun-Soo; Jeong, Kyu Shik; Lee, Eui-Wan; Jin, Bong‐Soo; Moon, Seong‐In; Doh, Chil‐Hoon

doi:10.1007/bf02705721

Cited by 5 publications

(3 citation statements)

References 14 publications

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“…Controlled growth of SiO 2 coatings on these materials have also been shown to significantly decrease volume expansion, improving capacity retention during cycling when the coating was optimized to between 2 and 10 nm. , For comparison, a recent report by Wang et al reveals nanowire performance retaining 1100 mA h g –1 after 1000 cycles . This is in agreement with previous investigation onto the carbon coating of Si particles, prior to cell assembly, which suggests the main advantage of PVDF is the localized reaction between HF leached during carbonization and SiO 2 , thereby controlling layer thickness. − …”

supporting

confidence: 76%

“…A similar confirmatory result is found from the energy dispersive spectroscopy (EDS) line scan available in Figure S5. This phenomenon is likely described by the decomposition of the PVDF matrix, releasing traces of HF which are consumed locally due to the partial etching SiO 2 . − It is suspected that this etching regulates the formation of porous SiO 2 − and allows carbon to deposit within the surface cavities created. Practically, the combined SiO 2 and C coating may have a synergistic effect, the higher surface area anchoring the carbon shell and increasing both electrical and ionic conductivity through the SiO 2 layer.…”

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confidence: 99%

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Engineered Si Electrode Nanoarchitecture: A Scalable Postfabrication Treatment for the Production of Next-Generation Li-Ion Batteries

et al. 2013

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A novel, economical flash heat treatment of the fabricated silicon based electrodes is introduced to boost the performance and cycle capability of Li-ion batteries. The treatment reveals a high mass fraction of Si, improved interfacial contact, synergistic SiO2/C coating, and a conductive cellular network for improved conductivity, as well as flexibility for stress compensation. The enhanced electrodes achieve a first cycle efficiency of ∼84% and a maximum charge capacity of 3525 mA h g(-1), almost 84% of silicon's theoretical maximum. Further, a stable reversible charge capacity of 1150 mA h g(-1) at 1.2 A g(-1) can be achieved over 500 cycles. Thus, the flash heat treatment method introduces a promising avenue for the production of industrially viable, next-generation Li-ion batteries.

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confidence: 76%

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confidence: 99%

Engineered Si Electrode Nanoarchitecture: A Scalable Postfabrication Treatment for the Production of Next-Generation Li-Ion Batteries

et al. 2013

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“…Particulate coatings are commonly used for many industrial products such as solar cells, batteries and so on. The properties and performance of the coatings depend on the microstructure, and it is important to understand the microstructural change during drying, which can be characterized by the particle distribution, the degree of alignment, and the coating thickness.…”

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confidence: 99%

Prediction of Coating Thickness in the Convective Assembly Process

Jung

Ahn

2013

Langmuir

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Convective assembly is a coating method to fabricate thin films with ordered particle structures that can be used extensively for biochemical sensors, data storage devices, optical devices, and other applications. The fluid flow into or through the close-packed region causes the convective assembly, and it is important to understand the formation mechanism of the close-packed region. In this paper, the length of the close-packed region was predicted, and the dimensionless coating thickness as well as the dimensionless length of the close-packed region was found to be the functions of only three dimensionless variables: two capillary numbers and the initial volume fraction. From the modeling results, coating process regime maps that predict the dimensionless coating thickness in terms of the dimensionless variables were created. In addition, the length of the close-packed region was measured under various coating conditions to validate the model prediction. The experiments firmly supported the model predictions.

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CoSe₂ Nanoparticles Encapsulated by N‐Doped Carbon Framework Intertwined with Carbon Nanotubes: High‐Performance Dual‐Role Anode Materials for Both Li‐ and Na‐Ion Batteries

et al. 2018

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It is of fundamental and technological significance to develop dual‐role anode materials for both lithium‐ion batteries (LIBs) and sodium‐ion batteries (SIBs) with high performance. Here, a composite material based on CoSe2 nanoparticles encapsulated in N‐doped carbon framework intertwined with carbon nanotubes (CoSe2@N‐CF/CNTs) is prepared successfully from cobalt‐based zeolitic imidazolate framework (ZIF‐67). As anode materials for LIBs, CoSe2@N‐CF/CNTs composites deliver a reversible capacity of 428 mAh g−1 even after 500 cycles at a current density of 1 A g−1 with almost 100% Coulombic efficiency. The charge and discharge mechanisms of CoSe2 are characterized using ex situ X‐ray diffraction and Raman analysis, from which the lithiation products of CoSe2 are found to be LixCoSe2 and Li2Se, which are further converted to CoSe2 upon delithiation. The CoSe2@N‐CF/CNTs composites also demonstrate excellent electrochemical performance as anode materials for SIBs with a carbonate‐based electrolyte, with specific capacities of 606 and 501 mAh g−1 at 0.1 and 1 A g−1 in the 100th cycle. The electrochemical performance of the anode materials is further studied by pseudocapacitance and galvanostatic intermittent titration technique (GITT) measurements. This work may be exploited for the rational design and development of dual‐role anode materials for both Li‐ and Na‐ion batteries.

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A study on carbon coating to silicon and electrochemical characteristics of Si-C/Li cells

Cited by 5 publications

References 14 publications

Engineered Si Electrode Nanoarchitecture: A Scalable Postfabrication Treatment for the Production of Next-Generation Li-Ion Batteries

Engineered Si Electrode Nanoarchitecture: A Scalable Postfabrication Treatment for the Production of Next-Generation Li-Ion Batteries

Prediction of Coating Thickness in the Convective Assembly Process

CoSe₂ Nanoparticles Encapsulated by N‐Doped Carbon Framework Intertwined with Carbon Nanotubes: High‐Performance Dual‐Role Anode Materials for Both Li‐ and Na‐Ion Batteries

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A study on carbon coating to silicon and electrochemical characteristics of Si-C/Li cells

Cited by 5 publications

References 14 publications

Engineered Si Electrode Nanoarchitecture: A Scalable Postfabrication Treatment for the Production of Next-Generation Li-Ion Batteries

Engineered Si Electrode Nanoarchitecture: A Scalable Postfabrication Treatment for the Production of Next-Generation Li-Ion Batteries

Prediction of Coating Thickness in the Convective Assembly Process

CoSe2 Nanoparticles Encapsulated by N‐Doped Carbon Framework Intertwined with Carbon Nanotubes: High‐Performance Dual‐Role Anode Materials for Both Li‐ and Na‐Ion Batteries

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CoSe₂ Nanoparticles Encapsulated by N‐Doped Carbon Framework Intertwined with Carbon Nanotubes: High‐Performance Dual‐Role Anode Materials for Both Li‐ and Na‐Ion Batteries