Effects of adhesion and cohesion on the electrochemical performance and durability of silicon composite electrodes

Jiazhi Hu, Yikai Wang, Dawei Li, Yang Tse Cheng

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

Although the choice of binder is crucial in determining the electrochemical performance and durability of silicon-based electrodes, the underlying mechanisms (e.g., mechanical vs. chemical) are unclear. Here, we report a study of the effects of adhesion vs. cohesion on the electrochemical behavior of silicon nanoparticle/polymeric binder/carbon black (CB) electrodes on copper conductor by multiple techniques. Two types of polymeric binders, polyvinylidene fluoride (PVDF) and sodium alginate (SA), were chosen for this study. The results show that because of a sufficiently strong interface between polymer and the copper current collector, both Si/PVDF/CB and Si/SA/CB composite electrode laminates have sufficient adhesive strength with the Cu conductor to cause cohesive failure within the electrode laminate during peel test. However, the interfacial strength between SA and silicon is significantly higher than that between PVDF and silicon, resulting in stronger cohesion within the Si/SA/CB electrode (e.g., peel strength of 78.3 N/m for Si/SA/CB electrode and 8.7 N/m for Si/PVDF/CB electrode, respectively). With a higher cohesive strength provided by a stronger binder-silicon interface, superior cell performance was ensured for Si/SA/CB electrodes. Hydrogen bonding is likely responsible for the stronger SA-Si interface since neither PVDF nor SA bonds covalently with Si according to chemical analysis.

Original languageEnglish
Pages (from-to)223-230
Number of pages8
JournalJournal of Power Sources
Volume397
DOIs
StatePublished - Sep 1 2018

Bibliographical note

Funding Information:
The authors are grateful for the financial support from the National Science Foundation (Award number 1355438 , Powering the Kentucky Bioeconomy for a Sustainable Future). The authors would also like to thank Dr. Xiaosong Huang of General Motors R&D Center, Dr. Jiagang Xu of General Motors R&D Center, Dr. Wensheng He of Arkema, Inc., Prof. Dibakar Bhattacharyya and Prof. Dong Young Kim of University of Kentucky for helpful discussions and Nancy Miller, Nicholas Cprek, and Baleegh S Alobaid of University of Kentucky for technical assistance.

Funding Information:
The authors are grateful for the financial support from the National Science Foundation (Award number 1355438, Powering the Kentucky Bioeconomy for a Sustainable Future). The authors would also like to thank Dr. Xiaosong Huang of General Motors R&D Center, Dr. Jiagang Xu of General Motors R&D Center, Dr. Wensheng He of Arkema, Inc., Prof. Dibakar Bhattacharyya and Prof. Dong Young Kim of University of Kentucky for helpful discussions and Nancy Miller, Nicholas Cprek, and Baleegh S Alobaid of University of Kentucky for technical assistance.

Publisher Copyright:
© 2018 Elsevier B.V.

Keywords

  • Binder-silicon interface
  • Lithium ion batteries
  • Polymer binder
  • Silicon

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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