Milled flake graphite/plasma nano-silicon@carbon composite with void sandwich structure for high performance as lithium ion battery anode at high temperature

Chen, Hedong; Hou, Xianhua; Chen, Fuming; Wang, Shaofeng; Wu, Bo; Ru, Qiang; Qin, Haiqing; Xia, Yingchun

doi:10.1016/j.carbon.2018.01.021

Cited by 119 publications

(43 citation statements)

References 45 publications

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“…The correlative potential plateaus shown in discharge/charge voltage profiles (Figure a) agree well with the cyclic voltammograms (Figure b). The 1 st , 2 nd , 3 rd , 5 th and 10 th cycle voltage profiles of Si@PDA@Gra structure s at the current rate of 200 mA g −1 are shown in Figure a, which are in accordance with the recent literatures …”

Section: Resultssupporting

confidence: 90%

“…The 1 st , 2 nd , 3 rd , 5 th and 10 th cycle voltage profiles of Si@PDA@Gra structures at the current rate of 200 mA g À 1 are shown in Figure 4a, which are in accordance with the recent literatures. [34][35][36] The potential plateaus between 0.1 and 0.4 V are reflecting the characteristics of primary Si nanoparticles. [37] The voltage plateaus are much more stable than those from silicon nanoparticles ( Figure S4), indicating a high cycle stability of Si@PDA@Gra anodes.…”

Section: Resultsmentioning

confidence: 96%

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A Facile Path to Graphene‐Wrapped Polydopamine‐Entwined Silicon Nanoparticles with High Electrochemical Performance

et al. 2019

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Graphene‐coated silicon nanoparticles with polydopamine buffers have been designed and successfully fabricated as anodes for lithium ion batteries, where the polydopamine was grown on the silicon nanoparticles and then coated with graphene layers. The expansion cavities for silicon nanoparticles during charging and discharging process are provided by the polydopamine buffer layers. The outermost graphene coating layers not only keep the pulverized silicon particles together without disintegration, but also improve the electric conductivity of silicon nanoparticles. Silicon nanoparticles of an industrial product level with different size distributions and oxidation layers were used in this work. High electrochemical performances with specific capacities of 1100 mAh g−1 were achieved by the designed silicon composites with polydopamine and graphene after 550 cycles at a current rate of 200 mA g−1.

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 96%

A Facile Path to Graphene‐Wrapped Polydopamine‐Entwined Silicon Nanoparticles with High Electrochemical Performance

et al. 2019

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“…In spite of extremely high Coulombic efficiency and long‐term cycling stability being achieved in this case, relatively low capacity was showed and the fabrication procedure was complicated. Some other silicon/carbon composite using void sandwich structure strategies were also investigated to improve the long cycling performance of silicon anode, but the capacity retention and cycling stability are still far more satisfactory under large current density …”

Section: Introductionmentioning

confidence: 99%

A Quadruple‐Hydrogen‐Bonded Supramolecular Binder for High‐Performance Silicon Anodes in Lithium‐Ion Batteries

Zhang

Yang

Chen

et al. 2018

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196

145

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With extremely high specific capacity, silicon has attracted enormous interest as a promising anode material for next-generation lithium-ion batteries. However, silicon suffers from a large volume variation during charge/discharge cycles, which leads to the pulverization of the silicon and subsequent separation from the conductive additives, eventually resulting in rapid capacity fading and poor cycle life. Here, it is shown that the utilization of a self-healable supramolecular polymer, which is facilely synthesized by copolymerization of tert-butyl acrylate and an ureido-pyrimidinone monomer followed by hydrolysis, can greatly reduce the side effects caused by the volume variation of silicon particles. The obtained polymer is demonstrated to have an excellent self-healing ability due to its quadruple-hydrogen-bonding dynamic interaction. An electrode using this self-healing supramolecular polymer as binder exhibits an initial discharge capacity as high as 4194 mAh g and a Coulombic efficiency of 86.4%, and maintains a high capacity of 2638 mAh g after 110 cycles, revealing significant improvement of the electrochemical performance in comparison with that of Si anodes using conventional binders. The supramolecular binder can be further applicable for silicon/carbon anodes and therefore this supramolecular strategy may increase the choice of amendable binders to improve the cycle life and energy density of high-capacity Li-ion batteries.

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“…[15,16] Carbon coating has been reported as an effective approach in fabricating anodes. [17][18][19][20][21][22][23][24][25][26][27] Well-coated carbon shell or carbon interlayers can act as a conductive framework and electrolyte barrier, [28,29] and it can not only facilitate ion transfer but also restrain the growth of unstable SEI films. Among the carbon materials, graphene has attracted much attention due to its large specific surface area, good electronic conductivity and excellent flexibility.…”

Section: Introductionmentioning

confidence: 99%

“…Carbon coating has been reported as an effective approach in fabricating anodes . Well‐coated carbon shell or carbon interlayers can act as a conductive framework and electrolyte barrier, and it can not only facilitate ion transfer but also restrain the growth of unstable SEI films.…”

Section: Introductionmentioning

confidence: 99%

Assembly of Si@Void@Graphene Anodes for Lithium‐Ion Batteries: In Situ Enveloping of Nickel‐Coated Silicon Particles with Graphene

Zhao

Yao

et al. 2019

ChemElectroChem

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In this report, a yolk‐shell‐structured Si/graphene (Si/GR) material has been designed and successfully fabricated as an anode for lithium‐ion batteries (LIBs). With this approach, Si@Ni composite particles were fabricated by electroless deposition of a nickel template directly on silicon; then, three‐dimensional (3D) graphene layers were grown in situ around the composite particles to obtain a Si@Ni@GR structure. After removing the nickel interlayer, some voids were generated between the silicon particles and the graphene layers, thus forming a Si@void@GR structure. The coexistence of voids and the graphene layer may provide a synergistic effect. The voids may reserve space for silicon particles during volume expansion and buffer the mechanical pressure of the graphene layer. Meanwhile, the graphene cover may enhance lithium‐ion transport efficiency and electron transport rate, thereby improving the electrical conductivity of the anode. The well‐coated layers can also prevent the Si particles from being directly exposed to electrolyte, which can promote the formation of a stable SEI film and reduce the irreversible consumption of Li+. Therefore, such unique yolk‐shell structures offer the resultant Si@void@GR electrode a high reversible discharge capacity (1595 mAh g−1 after 100 cycles at a current density of 500 mA g−1) and the capacity to deliver a discharge capacity of 990 mAh g−1 even at a high current density of 4.8 A g−1.

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Milled flake graphite/plasma nano-silicon@carbon composite with void sandwich structure for high performance as lithium ion battery anode at high temperature

Cited by 119 publications

References 45 publications

A Facile Path to Graphene‐Wrapped Polydopamine‐Entwined Silicon Nanoparticles with High Electrochemical Performance

A Facile Path to Graphene‐Wrapped Polydopamine‐Entwined Silicon Nanoparticles with High Electrochemical Performance

A Quadruple‐Hydrogen‐Bonded Supramolecular Binder for High‐Performance Silicon Anodes in Lithium‐Ion Batteries

Assembly of Si@Void@Graphene Anodes for Lithium‐Ion Batteries: In Situ Enveloping of Nickel‐Coated Silicon Particles with Graphene

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