Enhanced autonomic shutdown of Li-ion batteries by polydopamine coated polyethylene microspheres

Marta Baginska, Benjamin J. Blaiszik, Tijana Rajh, Nancy R. Sottos, Scott R. White

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

Thermally triggered autonomic shutdown of a Lithium-ion (Li-ion) battery is demonstrated using polydopamine (PDA)-coated polyethylene microspheres applied onto a battery anode. The microspheres are dispersed in a buffered 10 mM dopamine salt solution and the pH is raised to initiate the polymerization and coat the microspheres. Coated microspheres are then mixed with an aqueous binder, applied onto a battery anode surface, dried, and incorporated into Li-ion coin cells. FTIR and Raman spectroscopy are used to verify the presence of the polydopamine on the surface of the microspheres. Scanning electron microscopy is used to examine microsphere surface morphology and resulting anode coating quality. Charge and discharge capacity, as well as impedance, are measured for Li-ion coin cells as a function of microsphere content. Autonomous shutdown is achieved by applying 1.7 mg cm-2 of PDA-coated microspheres to the electrode. The PDA coating significantly reduces the mass of microspheres for effective shutdown compared to our prior work with uncoated microspheres.

Original languageEnglish (US)
Pages (from-to)735-739
Number of pages5
JournalJournal of Power Sources
Volume269
DOIs
StatePublished - Dec 10 2014
Externally publishedYes

Keywords

  • Li-ion batteries
  • Polydopamine coating
  • Polyethylene microspheres
  • Thermal shutdown

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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