Exfoliated graphite as a flexible and conductive support for Si-based Li-ion battery anodes

Ma, Canliang; Ma, Chao; Wang, Junzhong; Wang, Huiqi; Shi, Jingli; Song, Yan; Guo, Quangui

doi:10.1016/j.carbon.2014.01.027

Cited by 72 publications

(39 citation statements)

References 36 publications

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“…Just like the CNT or graphene, the expanded graphite (EG) is low cost and more importantly, to support the active materials for an improved electrochemical performance of the electrodes due to its high electrical and thermal conductivity, porous structure and mechanical flexibility. [31] Zhao et al [32] reported an EG-based paper for use as a free standing anode and to further increase the Li storage capacity, Co3O4 NPs were delicately anchored between the NSs of EG. After 50 cycles its reversible capacity was increased 19.2% and this can be attributed to 3 factors: spacer effect (Co3O4), which facilitated the electrolyte diffusion, high mechanical strength and elasticity of EG buffered the volume expansion of the active material during the charging/discharging process, and the high conductivity of EG provided a fast transfer path for the electrons and ions.…”

Section: Free Standing Films For Besmentioning

confidence: 99%

Novel Pliable Electrodes for Flexible Electrochemical Energy Storage Devices: Recent Progress and Challenges

Yousaf

Shi

Wang

et al. 2016

Advanced Energy Materials

151

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(2016). Novel pliable electrodes for flexible electrochemical energy storage devices: recent progress and challenges. Advanced Energy Materials, 6(17). which has been published in final form at 10.1002/aenm.201600490 This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving. How to cite TSpace itemsAlways cite the published version, so the author(s) will receive recognition through services that track citation counts, e.g. Scopus. If you need to cite the page number of the author manuscript from TSpace because you cannot access the published version, then cite the TSpace version in addition to the published version using the permanent URI (handle) found on the record page.

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Section: Free Standing Films For Besmentioning

confidence: 99%

Novel Pliable Electrodes for Flexible Electrochemical Energy Storage Devices: Recent Progress and Challenges

Yousaf

Shi

Wang

et al. 2016

Advanced Energy Materials

151

View full text Add to dashboard Cite

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“…The coating of a glassy carbon electrode with EG (applied as a suspension, followed by solvent evaporation) provides an electrochemical sensor for tartrazine [88]. Furthermore, EG is effective as a support for Si-based Li-ion battery anodes [89]. In addition, EG [90,91] is effective as a catalyst support.…”

Section: Exfoliated Graphite Compositesmentioning

confidence: 99%

A review of exfoliated graphite

2015

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Exfoliated graphite (EG) refers to graphite that has a degree of separation of a substantial portion of the carbon layers in the graphite. Graphite nanoplatelet (GNP) is commonly prepared by mechanical agitation of EG. The EG exhibits clinginess, due to its cellular structure, but GNP does not. The clinginess allows the formation of EG compacts and flexible graphite sheet without a binder. The exfoliation typically involves intercalation, followed by heating. Upon heating, the intercalate vaporizes and/or decomposes into smaller molecules, thus causing expansion and cell formation. The sliding of the carbon layers relative to one another enables the cell wall to stretch. The exfoliation process is accompanied by intercalate desorption, so that only a small portion of the intercalate remains after exfoliation. The most widely used intercalate is sulfuric acid. The higher concentration of residue in unwashed EG causes the relative dielectric constant (50 Hz) of the EG to be 360 (higher than 120 for KOH-activated GNP), compared to the value of 38 for the water-washed case. An EG compact is obtained by the compression of EG at a pressure lower than that used for the fabrication of flexible graphite. Compared to flexible graphite, EG compacts are mechanically weak, but they exhibit viscous character, outof-plane electrical/thermal conductivity and liquid permeability. The viscous character (flexural loss tangent up to 35 for the solid part of the compact) stems from the sliding of the carbon layers relative to one another, with the ease of the sliding enhanced by the exfoliation process.

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“…Carbon is an ideal isolation material because of its excellent chemical stability, mechanical strength, electrical conductivity, and ion transmission. As a result, silicon/carbon (Si/C) composites have been widely designed to overcome the 55 disadvantages of Si anode and improve the electrochemical performances, such as cycling stability and rate capability [21][22][23][24] . Promising approaches to optimize the Si/C anode mainly include: creating a core-shell structured composite to prevent Si from exposing to electrolyte by encapsulating Si NPs in carbon shell 60 (Si@C) 25,26 , embedding Si in porous carbon (Si/po-C) to accommodate the volume expansion by void space in carbon matrix [27][28][29] , as well as combining the above promising methods, for example, fabricating pomegranate-like Si/C composite microspheres 30 .…”

Section: Introductionmentioning

confidence: 99%

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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Exfoliated graphite as a flexible and conductive support for Si-based Li-ion battery anodes

Cited by 72 publications

References 36 publications

Novel Pliable Electrodes for Flexible Electrochemical Energy Storage Devices: Recent Progress and Challenges

Novel Pliable Electrodes for Flexible Electrochemical Energy Storage Devices: Recent Progress and Challenges

A review of exfoliated graphite

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

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