Blood clot-inspired viscoelastic fibrin gel: New aqueous binder for silicon anodes in lithium ion batteries

Woong Ju Kim, Jin Gu Kang, Dong Wan Kim

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Binders are a key component of Si anodes for lithium-ion batteries. Many studies have been devoted to exploring new binders capable of suppressing electrical isolation under large volume changes of Si. The principal requirements for a good binder are a high level of surface polarity and mechanical stability. One class of binders receiving attention is those composed of polysaccharide building blocks. Inspired by blood clots, we propose a new binder based on fibrin, whose building blocks are amino acids. Its abundant polar functional groups and time-dependent viscoelastic behavior make fibrin attractive as a binder in Si anodes. Our fibrin-based Si electrode shows better cycling stability and rate performance than an alginate-based electrode. Further optimization by mixing fibrin with alginate and ionic cross-linking results in an advanced binder that demonstrates remarkable cycling stability between 0.01 and 1.0 V vs. Li/Li+ (740 mA h g−1 at 0.5 C after 500 cycles). This improved electrochemical property derives from the mechanical integrity of the electrode, which can be achieved by a balance between the stiffness and stress relaxation of the binder. This work highlights the potential of fibrin as a novel binder for Si anodes and offers guidance for the design of optimized binders.

Original languageEnglish
Pages (from-to)730-740
Number of pages11
JournalEnergy Storage Materials
Volume45
DOIs
Publication statusPublished - 2022 Mar

Keywords

  • Alginate
  • Binder
  • Fibrin
  • Silicon anode
  • Stiffness
  • Stress relaxation

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Energy Engineering and Power Technology

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