Unveiling the transformation of liquid crystalline domains into carbon crystallites during carbonization of mesophase pitch-derived fibers

Choi, Jiho; Lee, Yejung; Chae, Yangki; Kim, Sung Soo; Kim, Tae-Hwan; Lee, Sungho

doi:10.1016/j.carbon.2022.08.033

Cited by 19 publications

(5 citation statements)

References 49 publications

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“…Based on the specific surface area (9 m 2 g −1 ) of the untreated graphite particles (Figure 1d) and the residual coal content obtained during the heat treatment, the thickness of the coating layer was estimated to be 4.9 nm, assuming a coating layer density of 1.75 g cm −3 . 37 This was similar to the thickness of the layer with a disturbed structure in the TEM image (Figure 2d). The cross-sectional SEM images of the pristine sample and c10 are shown in Figure S2.…”

Section: Characterization Of Amorphous Carbon-coatedsupporting

confidence: 80%

“…In the pristine graphite particles, a fine lattice pattern is observed on the surface, whereas a pattern with disrupted lattice fringes is observed on the surface layer of c10 with a thickness of approximately 5 nm. Based on the specific surface area (9 m 2 g –1 ) of the untreated graphite particles (Figure d) and the residual coal content obtained during the heat treatment, the thickness of the coating layer was estimated to be 4.9 nm, assuming a coating layer density of 1.75 g cm –3 . This was similar to the thickness of the layer with a disturbed structure in the TEM image (Figure d).…”

Section: Resultsmentioning

confidence: 99%

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Edge Structure and Formation of a Solid Electrolyte Interphase Film in Amorphous Carbon-Coated Spheroidized Graphite

Oka,

Ikawa,

Takahashi

et al. 2024

ACS Appl. Energy Mater.

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Lithium-ion batteries use spheroidized graphite coated with amorphous carbon as the negative electrode material. In this study, we measured the physical properties of spheroidized graphite with varying amounts of an amorphous carbon coating to elucidate its effect on the battery performance. To this end, electrochemical evaluation and surface analysis of the graphite electrode were performed. The specific surface area was significantly reduced by the amorphous carbon coating because the pores, including the surface inside the spheroidized graphite particles, were occluded by the coating layer. By contrast, the capacitance at the graphite electrode/electrolyte interface did not correspond to the specific surface area, indicating that the amorphous carbon coating served as an edge plane. Consequently, efficiency at the initial charging−discharging cycle was improved, inducing a reduction in the charge-transfer resistance of lithium insertion/desorption. The solid electrolyte interphase formed on graphite was homogenized by the amorphous carbon coating, and the thickness was significantly reduced. The amorphous carbon coating suppressed the reductive decomposition of the electrolyte and increased the number of active sites for lithium insertion/desorption by reducing the number of bare overactive edges present on the surface of the spheroidized graphite particles. The results confirm that the design of an amorphous carbon coating that suppresses the overactivity of the edge during the reductive decomposition of electrolyte components while increasing the active points for lithium insertion and desorption is crucial for enhanced battery performance.

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Section: Characterization Of Amorphous Carbon-coatedsupporting

confidence: 80%

Section: Resultsmentioning

confidence: 99%

Edge Structure and Formation of a Solid Electrolyte Interphase Film in Amorphous Carbon-Coated Spheroidized Graphite

Oka,

Ikawa,

Takahashi

et al. 2024

ACS Appl. Energy Mater.

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show abstract

“…According to the reported literature, the graphitizable carbons commonly present such a variation trend and the rise in L c values may be ascribed to the increased stacking layer numbers of PAHs, while the decreased L c values could be related to gas evolution and the collapse of some unstable layers. 56,57 In this regard, some new insights are supplemented here. The asymmetric index (AI) of the 002 peak was investigated to elucidate the reason for the variation in the L c values.…”

Section: Resultsmentioning

confidence: 99%

A fundamental understanding of structure evolution in the synthesis of hard carbon from coal tar pitch for high-performance sodium storage

Ji,

Zhao,

Cao

et al. 2023

J. Mater. Chem. A

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“…Mesophase pitch (MP) with fine-flow texture has high purity, high carbon content, regular molecular arrangement, and good fluidity and is an excellent precursor for the preparation of needle coke, carbon foam, carbon fiber, etc. [1][2][3][4]. Pitch-based carbon fibers (CFs) prepared from mesophase pitch have the characteristics of light weight, high strength, high modulus, and high thermal conductivity, which make them one of the promising high performance fibers in applications for the aerospace industry, advanced industrial manufacturing, and other fields [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Mesophase Pitch with Fine-Flow Texture from Ethylene Tar/Naphthalene by Catalytic Synthesis for High-Thermal-Conductivity Carbon Fibers

He,

Wu,

Shi

et al. 2024

Polymers

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Mesophase pitch is usually prepared by radical polymerization or catalytic polymerization from coal tar, petroleum, and aromatic compounds, and the catalytic synthesis of mesophase pitch from pure aromatic compounds is more controllable in the preparation of high-quality mesophase pitch. However, the corrosive and highly toxic nature of the catalyst has limited the further development of this method. In this study, mesophase pitch was synthetized using ethylene tar and naphthalene as raw materials and boron trifluoride diethyl etherate as a catalyst. The effect of the catalytic reaction on the structure and properties of the mesophase pitch was investigated. The results show that naphthalene plays an important role in the mesophase content and reaction pressure (from above 6 MPa to 2.35 MPa). Mesophase pitch with fine-flow texture can be prepared by introducing more methylene groups, naphthenic structures, and aliphatic hydrocarbons during synthesis. Carbon fibers prepared from mesophase pitch show a split structure, and the thermal conductivity is 730 W/(m·K). This work provides theoretical support for lower toxicity and causticity and for reaction-controlled technology for the synthesis of high-purity mesophase pitch.

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Unveiling the transformation of liquid crystalline domains into carbon crystallites during carbonization of mesophase pitch-derived fibers

Cited by 19 publications

References 49 publications

Edge Structure and Formation of a Solid Electrolyte Interphase Film in Amorphous Carbon-Coated Spheroidized Graphite

Edge Structure and Formation of a Solid Electrolyte Interphase Film in Amorphous Carbon-Coated Spheroidized Graphite

A fundamental understanding of structure evolution in the synthesis of hard carbon from coal tar pitch for high-performance sodium storage

Preparation of Mesophase Pitch with Fine-Flow Texture from Ethylene Tar/Naphthalene by Catalytic Synthesis for High-Thermal-Conductivity Carbon Fibers

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