Systematic Investigation of the Alucone-Coating Enhancement on Silicon Anodes

Seoung Bum Son, Yikai Wang, Jiagang Xu, Xuemin Li, Markus Groner, Adam Stokes, Yongan Yang, Yang Tse Cheng, Chunmei Ban

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Polyvinylidene fluoride (PVDF) is the most popular binder in commercial lithium-ion batteries but is incompatible with a silicon (Si) anode because it fails to maintain the mechanical integrity of the Si electrode upon cycling. Herein, an alucone coating synthesized by molecular layer deposition has been applied on the laminated electrode fabricated with PVDF to systematically study the sole impact of the surface modification on the electrochemical and mechanical properties of the Si electrode, without the interference of other functional polymer binders. The enhanced mechanical properties of the coated electrodes, confirmed by mechanical characterization, can help accommodate the repeated volume fluctuations, preserve the electrode structure during electrochemical reactions, and thereby, leading to a remarkable improvement of the electrochemical performance. Owing to the alucone coating, the Si electrodes achieve highly reversible cycling performance with a specific capacity of 1490 mA h g-1 (0.90 mA h cm-2) as compared to 550 mA h g-1 (0.19 mA h cm-2) observed in the uncoated Si electrode. This research elucidates the important role of surface modification in stabilizing the cycling performance and enabling a high level of material utilization at high mass loading. It also provides insights for the future development of Si anodes.

Original languageEnglish
Pages (from-to)40143-40150
Number of pages8
JournalACS Applied Materials and Interfaces
Volume9
Issue number46
DOIs
StatePublished - Nov 22 2017

Bibliographical note

Funding Information:
The support from the Vehicle Technologies Office, Hybrid Electric Systems Program, David Howell (Manager), Battery R&D, Brian Cunningham and Peter Faguy (Technology Managers), at the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy are gratefully acknowledged.

Publisher Copyright:
© 2017 American Chemical Society.

Keywords

  • energy storage
  • lithium-ion batteries
  • molecular layer deposition
  • polyvinylidene fluoride binder
  • silicon-based anodes

ASJC Scopus subject areas

  • Materials Science (all)

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