Microtexture and structure of some high-modulus, PAN-base carbon fibres

Guigon, M.; Oberlin, A.; Désarmot, G.

doi:10.1016/0015-0568(84)90040-x

Cited by 131 publications

(41 citation statements)

References 6 publications

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“…In the microstructure of CFs, the graphitic layers tend to be oriented more parallel to the longitudinal axis of the fibre [14,15,16]. Therefore, the correlation between the longitudinal expansion of fully lithiated CFs and the expansion of the graphite network in LiC6 which are both about 1 % is noteworthy.…”

Section: Correlation With the Expansion Of The Structure Of Intercalamentioning

confidence: 92%

“…This diffusion is exhibited as a small contraction or expansion of the CF after lithiation or delithiation, respectively. Plausible explanations may lie in the description of the microstructure of PAN-based fibres given in previous studies [14,15,16]. The graphitic layer planes may be essentially parallel to the surface in the shell region and increasingly folded closer to the centre of the core region where the diffusion of Li might be slower.…”

Section: Longitudinal Expansion Of the Cfs During Ocpmentioning

confidence: 99%

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Expansion of carbon fibres induced by lithium intercalation for structural electrode applications

Jacques

Kjell

Zenkert

et al. 2013

Carbon

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Expansion of carbon fibres induced by lithium intercalation for structural electrode applications. intercalation. An innovative in-situ technique for studying the longitudinal expansion of the CF and the relationship with the amount of intercalated Li is described in the present paper. The polyacrylonitrile-based CFs, T800H and unsized IMS65, were chosen for their electrochemical storage capacities. It was found that the CF expands during lithiation and contracts during delithiation. At the first electrochemical cycle, the expansion is partly irreversible which supports that the first-cycle capacity loss partly relates to Li trapped in the CF structure. For the following cycles, the capacity and the expansion are reversible. The expansion, which might relate to tensile stress, increases up to 1 % as the measured capacity approaches the theoretical limit of 372 mAh/g for Li storage in graphite. Minor additional expansions due to the uneven distribution of intercalated Li in the CF structure were measured before and after lithiations. Using scanning electron microscope images the transverse expansion of fully lithiated CFs was estimated to about 10 % of the cross-section area.

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Section: Correlation With the Expansion Of The Structure Of Intercalamentioning

confidence: 92%

Section: Longitudinal Expansion Of the Cfs During Ocpmentioning

confidence: 99%

Expansion of carbon fibres induced by lithium intercalation for structural electrode applications

Jacques

Kjell

Zenkert

et al. 2013

Carbon

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“…PAN-based CFs can be seen as having a microcomposite structure, made of turbostratic folded and interlinked carbon layers forming fibrils of graphitic crystallites almost aligned with the fibre axis and immersed in a micromatrix of quasi-amorphous carbon [19]. Useful lamellar models based on the microtexture of the CFs explaining the experimental data and tensile properties can be found [20,21]. The CFs modulus is mainly determined by the crystallites size and their degree of orientation with respect to the fibre axis.…”

Section: Discussion Of the Possible Mechanisms Governing The Strengthmentioning

confidence: 99%

The effect of lithium-intercalation on the mechanical properties of carbon fibres

Jacques

Kjell

Zenkert

et al. 2014

Carbon

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The effect of lithium-intercalation on the mechanical properties of carbon fibres. , 68: 725-733 http://dx.doi.org/10.1016/j.carbon. 2013.11.056 Access to the published version may require subscription. Carbon AbstractCarbon fibres (CFs) can be used as lightweight structural electrodes since they have high specific tensile stiffness and ultimate tensile strength (UTS), and high lithium (Li)-intercalation capability. This paper investigates the relationship between the amount of intercalated Li and the changes induced in the tensile stiffness and UTS of polyacrylonitrilebased CF tows. After a few electrochemical cycles the stiffness was not degraded and independent of the measured capacity. A drop in the UTS of lithiated CFs was only partly recovered during delithiation and clearly larger at the highest measured capacities, but remained less than 40% at full charge. The reversibility of this drop with the C-rate and measured capacity supports that the fibres are not damaged, that some Li is irreversibly trapped in the delithiated CFs and that reversible strains develop in the fibre. However, the drop in the strength does not vary linearly with the measured capacity and the drop in the ultimate tensile strain remains lower than the CF longitudinal expansion at full charge. These results suggest that the loss of strength might relate to the degree of lithiation of defectives areas which govern the tensile failure mode of the CFs.

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“…In Fig. 5b, the number of the layers is increased to nearly 10 and the length of the column increased to 10 nm with a heat-treatment temperature of 1500°C as they became more aligned [26,27]. However, there was no clear change in the structure when the heat-treatment temperature of 2000°C due to the structural development limit.…”

Section: Temmentioning

confidence: 91%

Preparation and characterization of isotropic pitch-based carbon fiber

Zhu¹,

Joh²,

Kim³

et al. 2013

Carbon letters

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Isotropic pitch fibers were stabilized and carbonized for preparing carbon fibers. To optimize the duration and temperature during the stabilization process, a thermogravimetric analysis was conducted. Stabilized fibers were carbonized at 1000, 1500, and 2000°C in a furnace under a nitrogen atmosphere. An elemental analysis confirmed that the carbon content increased with an increase in the carbonization temperature. Although short graphitic-like layers were observed with carbon fibers heat-treated at 1500 and 2000°C, Raman spectroscopy and X-ray diffraction revealed no significant effect of the carbonization temperature on the crystalline structure of the carbon fibers, indicating the limit of developing an ordered structure of isotropic pitch-based carbon fibers. The electrical conductivity of the carbonized fiber reached 3.9 × 10 4 S/m with the carbonization temperature increasing to 2000°C using a four-point method.

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Microtexture and structure of some high-modulus, PAN-base carbon fibres

Cited by 131 publications

References 6 publications

Expansion of carbon fibres induced by lithium intercalation for structural electrode applications

Expansion of carbon fibres induced by lithium intercalation for structural electrode applications

The effect of lithium-intercalation on the mechanical properties of carbon fibres

Preparation and characterization of isotropic pitch-based carbon fiber

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