Study of activation mechanism for dual model pore structured carbon based on effects of molecular weight of petroleum pitch

Kim, Ji Hong; Choi, Yong; Im, Ji Sun; Jo, A Young; Lee, Ki Bong; Bai, Byong Chol

doi:10.1016/j.jiec.2020.04.022

Cited by 19 publications

(10 citation statements)

References 33 publications

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“…The bottom-up method is an atomic- and molecular-scale self-assembly method, in which gaseous precursors (e.g., SiH 4 ) are decomposed to grow silicon particles on the substrate (template) or support. − This chemical vapor deposition (CVD) process is a simple and rapid method to achieve uniform surface coating and homogeneous growth of the Si particle on a substrate or support material. , Among the candidates that can be used as support, activated carbon is considered a promising material. Activated carbon can be produced from low-cost raw materials such as petroleum residue, steel byproducts, and biomass; it has excellent economic efficiency, and its manufacturing process is simple. − In addition, owing to its high porosity, activated carbon is expected to improve the site for Si particle deposition, and its porosity can be easily controlled by activation process parameters. , Although many studies ,− using porous carbon materials for Si deposition have been conducted, few studies have focused on the correlation between the porosity of activated carbon support and the Si deposition mechanism. In addition, a study on the effect of “porosity” on the electrochemical characteristics of the Si@C composite electrode is important.…”

Section: Introductionmentioning

confidence: 99%

“… 28 − 32 In addition, owing to its high porosity, activated carbon is expected to improve the site for Si particle deposition, and its porosity can be easily controlled by activation process parameters. 30 , 33 Although many studies 24 , 34 − 37 using porous carbon materials for Si deposition have been conducted, few studies have focused on the correlation between the porosity of activated carbon support and the Si deposition mechanism. In addition, a study on the effect of “porosity” on the electrochemical characteristics of the Si@C composite electrode is important.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Porosity in Activated Carbon Supports for Silicon-Based Lithium-Ion Batteries (LIBs)

Choi

et al. 2023

ACS Omega

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Activated carbon supports for Si deposition with different porosities were prepared, and the effect of porosity on the electrochemical characteristics was investigated. The porosity of the support is a key parameter affecting the Si deposition mechanism and the stability of the electrode. In the Si deposition mechanism, as the porosity of activated carbon increases, the effect of particle size reduction due to the uniform dispersion of Si was confirmed. This implies that the porosity of activated carbon can affect the rate performance. However, excessively high porosity reduced the contact area between Si and activated carbon, resulting in poor electrode stability. Therefore, controlling the porosity of activated carbon is essential to improving the electrochemical characteristics.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Porosity in Activated Carbon Supports for Silicon-Based Lithium-Ion Batteries (LIBs)

Choi

et al. 2023

ACS Omega

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“…Pitch is synthesized by volatilizing low-molecular-weight PAHs and polycondensation, which involves dehydrogenation and dealkylation [16][17][18]. The polycondensation reaction is required above 400 • C in the simple thermal reaction, and an anisotropic phase (called mesophase) is formed as a result.…”

Section: Introductionmentioning

confidence: 99%

Ex Situ Study on the Co-Preparation of Pitch and Carbon Black from Petroleum Residue to Improve the Cost-Efficiency of the Pitch Synthesis Plant

Kim

2023

Materials

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This study aims to improve the economic efficiency of the pitch synthesis reaction on the pilot plant by optimizing the pitch synthesis reaction and utilization of the byproduct. The pitch was synthesized using a 150 L pilot plant with pyrolyzed fuel oil as a precursor. The pitch synthesis reaction is carried out through volatilization and polycondensation, which occur at 300 and 400 °C. Volatilization is terminated during heating; thus, additional soaking time is meaningless and reduces the process efficiency. Soaking time is a major variable when the synthesis temperature exceeds 400 °C. The byproduct is generated through volatilization; thus, its chemical characteristics are only influenced by the reaction temperature. The byproduct consists of various polycyclic aromatic hydrocarbons. The average molecular weight and yield of the byproduct increase with the reaction temperature. Carbon black was synthesized using chemical vapor deposition from the byproduct. The particle size of carbon black was controlled by the used precursor (byproduct), and the electrical conductivity of prepared carbon black has a maximum of 58.0 S/cm. Therefore, carbon black, which is synthesized from the byproduct of pitch synthesis, is expected to be used as a precursor for conductive material used in lithium-ion batteries or supercapacitors.

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“…Pitch is a waste generated by petrochemical industries and is usually burned as a fuel; consequently, huge amounts of CO 2 are released into the atmosphere, resulting in global warming. However, through a proper heat treatment, soft carbon can be obtained from pitch. , This pitch-based soft carbon anode material exhibits high conductivity and mechanical strength and, hence, outstanding electrochemical characteristics that are advantageous for LIBs. , …”

Section: Introductionmentioning

confidence: 99%

“…However, through a proper heat treatment, soft carbon can be obtained from pitch. 48,49 This pitch-based soft carbon anode material exhibits high conductivity and mechanical strength and, hence, outstanding electrochemical characteristics that are advantageous for LIBs. 50,51 Nozzle spray drying is widely used in particle production.…”

Section: Introductionmentioning

confidence: 99%

Silicon Single Walled Carbon Nanotube-Embedded Pitch-Based Carbon Spheres Prepared by a Spray Process with Modified Antisolvent Precipitation for Lithium Ion Batteries

Liang

Liou

et al. 2021

Energy Fuels

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Si is regarded as a next-generation anode material for high-energy density lithium-ion batteries (LIBs). However, Si-based anode materials cause intractable problems that result in ceaseless capacity decay and poor cyclic performance. In this study, two types of industrial wastes, Si powder (from the photovoltaic industry) and pitch (from petroleum residue), were selected as the active material and carbon source, respectively, for preparing a Si single-walled carbon nanotube (SWCNT)-embedded carbon composite. A good conductive pathway was created by the SWCNTs, and the inner voids in the composite increased its conductivity and provided extra space for accommodating the volume expansion of lithiated Si. In addition, a porous pitch-based spherical composite with embedded Si and SWCNTs was fabricated through a designed one-step process using a combination of the spray-drying and antisolvent precipitation techniques and a series of thermal treatments. The cycling test results revealed that the composite showed the high reversible specific capacities of 2001 mAh g −1 at 1 A/g (0.5 C) with a retention of 66.1% and 1682 mAh g −1 at 1 A/g (0.5 C) with a retention of 55.6% after the 100th and 200th cycles, respectively. These results imply that the pitch-derived soft carbon and SWCNTs provided an excellent conductivity, and the porous structure of the composite accommodated the stress produced by the Si expansion.

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Study of activation mechanism for dual model pore structured carbon based on effects of molecular weight of petroleum pitch

Cited by 19 publications

References 33 publications

Effect of Porosity in Activated Carbon Supports for Silicon-Based Lithium-Ion Batteries (LIBs)

Effect of Porosity in Activated Carbon Supports for Silicon-Based Lithium-Ion Batteries (LIBs)

Ex Situ Study on the Co-Preparation of Pitch and Carbon Black from Petroleum Residue to Improve the Cost-Efficiency of the Pitch Synthesis Plant

Silicon Single Walled Carbon Nanotube-Embedded Pitch-Based Carbon Spheres Prepared by a Spray Process with Modified Antisolvent Precipitation for Lithium Ion Batteries

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