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Ultra-thick porous films of graphene-encapsulated silicon nanoparticles as flexible anodes for lithium ion batteries

•A flexible and porous RGO/Si composite film as thick as 25μm was readily prepared.•The porous structure enhances the contact area of the active material and electrolyte.•RGO provides continuous conductive path for Si NPs and prevents them from pulverizing.•The electrode shows a high specific capaci... Full description

Journal Title: Electrochimica Acta 20 August 2015, Vol.174, pp.688-695
Main Author: Yue, Hongwei
Other Authors: Wang, Suiyan , Yang, Zhibo , Li, Qun , Lin, Shumei , He, Deyan
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 0013-4686 ; DOI: 10.1016/j.electacta.2015.06.042
Link: http://dx.doi.org/10.1016/j.electacta.2015.06.042
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recordid: sciversesciencedirect_elsevierS0013-4686(15)01413-9
title: Ultra-thick porous films of graphene-encapsulated silicon nanoparticles as flexible anodes for lithium ion batteries
format: Article
creator:
  • Yue, Hongwei
  • Wang, Suiyan
  • Yang, Zhibo
  • Li, Qun
  • Lin, Shumei
  • He, Deyan
subjects:
  • Graphene/Silicon Composite Film
  • Anodes
  • High Areal Capacity
  • Lithium Ion Battery
ispartof: Electrochimica Acta, 20 August 2015, Vol.174, pp.688-695
description: •A flexible and porous RGO/Si composite film as thick as 25μm was readily prepared.•The porous structure enhances the contact area of the active material and electrolyte.•RGO provides continuous conductive path for Si NPs and prevents them from pulverizing.•The electrode shows a high specific capacity and an excellent rate capability. Silicon is a highly promising anode material of lithium ion batteries (LIBs) for its low insertion voltage and high reversible capacity. A flexible, honeycomb-like film of reduced graphene (RGO)/Si nanoparticles (NPs) composite with a thickness as thick as 25μm is synthesized by a facile vacuum filter assembly process. The Si NPs are enwrapped into the RGO sheets with an areal density of 0.65mgcm−2. The ultra-thick composite film is directly employed as an anode for LIBs without using any binder and conductive additive. The flexible RGO sheet coat enables the electrode to maintain the structural integrity and provide continuous conductive paths for Si NPs. The electrode exhibits a high capacity of 2370mAhg−1 over 50 cycles at a current of 210mAg−1 and a capacity higher than 1000mAhg−1 at a current density of 4200mAg−1 after 500 cycles. Especially, the electrode exhibits excellent rate capability, indicating that it may be applied to the high-power LIBs as a flexible, high areal capacity, binder-free and free-standing anode.
language: eng
source:
identifier: ISSN: 0013-4686 ; DOI: 10.1016/j.electacta.2015.06.042
fulltext: fulltext
issn:
  • 00134686
  • 0013-4686
url: Link


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titleUltra-thick porous films of graphene-encapsulated silicon nanoparticles as flexible anodes for lithium ion batteries
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identifierISSN: 0013-4686 ; DOI: 10.1016/j.electacta.2015.06.042
subjectGraphene/Silicon Composite Film ; Anodes ; High Areal Capacity ; Lithium Ion Battery
description•A flexible and porous RGO/Si composite film as thick as 25μm was readily prepared.•The porous structure enhances the contact area of the active material and electrolyte.•RGO provides continuous conductive path for Si NPs and prevents them from pulverizing.•The electrode shows a high specific capacity and an excellent rate capability. Silicon is a highly promising anode material of lithium ion batteries (LIBs) for its low insertion voltage and high reversible capacity. A flexible, honeycomb-like film of reduced graphene (RGO)/Si nanoparticles (NPs) composite with a thickness as thick as 25μm is synthesized by a facile vacuum filter assembly process. The Si NPs are enwrapped into the RGO sheets with an areal density of 0.65mgcm−2. The ultra-thick composite film is directly employed as an anode for LIBs without using any binder and conductive additive. The flexible RGO sheet coat enables the electrode to maintain the structural integrity and provide continuous conductive paths for Si NPs. The electrode exhibits a high capacity of 2370mAhg−1 over 50 cycles at a current of 210mAg−1 and a capacity higher than 1000mAhg−1 at a current density of 4200mAg−1 after 500 cycles. Especially, the electrode exhibits excellent rate capability, indicating that it may be applied to the high-power LIBs as a flexible, high areal capacity, binder-free and free-standing anode.
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abstract•A flexible and porous RGO/Si composite film as thick as 25μm was readily prepared.•The porous structure enhances the contact area of the active material and electrolyte.•RGO provides continuous conductive path for Si NPs and prevents them from pulverizing.•The electrode shows a high specific capacity and an excellent rate capability. Silicon is a highly promising anode material of lithium ion batteries (LIBs) for its low insertion voltage and high reversible capacity. A flexible, honeycomb-like film of reduced graphene (RGO)/Si nanoparticles (NPs) composite with a thickness as thick as 25μm is synthesized by a facile vacuum filter assembly process. The Si NPs are enwrapped into the RGO sheets with an areal density of 0.65mgcm−2. The ultra-thick composite film is directly employed as an anode for LIBs without using any binder and conductive additive. The flexible RGO sheet coat enables the electrode to maintain the structural integrity and provide continuous conductive paths for Si NPs. The electrode exhibits a high capacity of 2370mAhg−1 over 50 cycles at a current of 210mAg−1 and a capacity higher than 1000mAhg−1 at a current density of 4200mAg−1 after 500 cycles. Especially, the electrode exhibits excellent rate capability, indicating that it may be applied to the high-power LIBs as a flexible, high areal capacity, binder-free and free-standing anode.
pubElsevier Ltd
doi10.1016/j.electacta.2015.06.042
eissn18733859
date2015-08-20