The effects of cross-linking in a supramolecular binder on cycle life in silicon microparticle anodes

Jeffrey Lopez, Zheng Chen, Chao Wang, Sean C. Andrews, Yi Cui*, Zhenan Bao

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Self-healing supramolecular binder was previously found to enhance the cycling stability of micron-sized silicon particles used as the active material in lithium-ion battery anodes. In this study, we systematically control the density of cross-linking junctions in a modified supramolecular polymer binder in order to better understand how viscoelastic materials properties affect cycling stability. We found that binders with relaxation times on the order of 0.1 s gave the best cycling stability with 80% capacity maintained for over 175 cycles using large silicon particles (∼0.9 um). We attributed this to an improved balance between the viscoelastic stress relaxation in the binder and the stiffness needed to maintain mechanical integrity of the electrode. The more cross-linked binder showed markedly worse performance confirming the need for liquid-like flow in order for our self-healing polymer electrode concept to be effective.

Original languageEnglish (US)
Title of host publicationProcess Development Division 2016 - Core Programming Area at the 2016 AIChE Meeting
PublisherAIChE
Pages180-186
Number of pages7
ISBN (Electronic)9781510834460
DOIs
StatePublished - 2016
EventProcess Development Division 2016 - Core Programming Area at the 2016 AIChE Meeting - San Francisco, United States
Duration: Nov 13 2016Nov 18 2016

Publication series

NameProcess Development Division 2016 - Core Programming Area at the 2016 AIChE Meeting

Conference

ConferenceProcess Development Division 2016 - Core Programming Area at the 2016 AIChE Meeting
Country/TerritoryUnited States
CitySan Francisco
Period11/13/1611/18/16

Keywords

  • High capacity anode
  • Lithium-ion battery
  • Microparticles
  • Polymer binder
  • Self-healing
  • Silicon
  • Viscoelasticity

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Engineering(all)
  • Management of Technology and Innovation

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