A comparison of the effect of graphitization on microstructures and properties of polyacrylonitrile and mesophase pitch-based carbon fibers

Qin, Xianying; Lu, Youming; Xiao, H.; Wen, Ya; Tian, Yu

doi:10.1016/j.carbon.2012.05.024

Cited by 175 publications

(122 citation statements)

References 27 publications

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“…Then the Si/po-C@C powder, carbon black (Super-P) and sodium alginate 40 with a mass ratio of 6:2:2 were mixed in an agate mortar. As the deionized water was added dropwise, the mixture was slightly ground to form a homogeneous slurry.…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

“…The sharp diffraction peaks (28.4 °, 47.3 °, 50.1 °, 69.1 °, 76.3 °) correspond to the characteristic crystal planes ((111), (220), (311), (400), (331)) of Si crystallites, respectively 36 . And the relatively broad and weak two peaks at around 23 ° and 43 ° are 5 derived from the crystallographic planes (002) and (100), respectively, for PAN-based carbon 40,41 . The porous structure of Si/po-C@C composite is determined by the nitrogen isothermal adsorption/desorption measurement, as shown in Figure S5a.…”

Section: Structure and Morphologymentioning

confidence: 99%

“…Moreover, the repeated volume change results in the loss of electrical contact between Si NPs and conductive additives 13 . 40 Compared with the raw Si electrode, the Si/po-C@C electrode is measured under same conditions and shows a high capacity and excellent cycling stability. The reversible capacity for Si/po-C@C electrode slowly changes from 997 mAh g -1 for the initial cycle to 703 mAh g -1 after 150 cycles, showing 71 % of 45 capacity retention.…”

Section: Structure and Morphologymentioning

confidence: 99%

“…Therefore, Si electrodes are characterized by material pulverization, loss of electrical contact with conductive additives and current collector, excessive consumption of electrolyte and increase of internal resistance by forming thick solid-electrolyte 40 interphase (SEI) repeatedly 12, 13 .…”

Section: Introductionmentioning

confidence: 99%

“…35 In this work, we applied a double coaxial electrospinning technique to fabricate hierarchical core-shell Si/C fibers (Si/po-C@C) containing a porous carbon framework in the core section as conductive pathway. A mixed polyacrylonitrile/ polystyrene (PAN/PS) solution doped with Si NPs was used as 40 the core solution to form the desired honeycomb-like carbon framework embedded with Si NPs, while PAN solution was employed as the shell solution to form a compact carbon shell. The detailed synthesis procedure and structural diagram for Si/po-C@C fibers are demonstrated in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

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Electrospun core–shell silicon/carbon fibers with an internal honeycomb-like conductive carbon framework as an anode for lithium ion batteries

et al. 2015

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Core-shell silicon/carbon (Si/C) fibers with an internal honeycomb-like carbon framework are prepared based on dual coaxial electrospinning. For this hierarchical structure, the fiber's core is composed of a porous carbon framework and embedded Si nanoparticles, which is further wrapped by a compact carbon shell. The well-defined Si/C composite anode shows high specific capacities, good capacity retention, and 10 high accessibility of Si in lithium-ion batteries. An initial reversible capacity of 997 mAh g -1 and a capacity retention of 71 % after 150 cycles are demonstrated with a current density of 0.2 A g -1 . At a higher current density of 0.5 A g -1 , a reversible capacity of 603 mAh g -1 can be maintained after 300 cycles. The accessibility of Si in the Si/C anode is up to 3612 mAh g -1 in the 1 st cycle. The excellent electrochemical properties are attributed to the hierarchical structure of Si/C fibers. The porous carbon 15 framework in the core region could not only accommodate the volume expansion of Si, but also enhance the conductivity inside these fibers. The compact carbon shell is able to prevent electrolyte from permeating into the core section, therefore a stable solid-electrolyte interphase can be formed on the fiber surface. 65

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Section: Electrochemical Characterizationmentioning

confidence: 99%

Section: Structure and Morphologymentioning

confidence: 99%