Research ArticleMATERIALS SCIENCE

Electrospun core-shell microfiber separator with thermal-triggered flame-retardant properties for lithium-ion batteries

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Science Advances  13 Jan 2017:
Vol. 3, no. 1, e1601978
DOI: 10.1126/sciadv.1601978

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Abstract

Although the energy densities of batteries continue to increase, safety problems (for example, fires and explosions) associated with the use of highly flammable liquid organic electrolytes remain a big issue, significantly hindering further practical applications of the next generation of high-energy batteries. We have fabricated a novel “smart” nonwoven electrospun separator with thermal-triggered flame-retardant properties for lithium-ion batteries. The encapsulation of a flame retardant inside a protective polymer shell has prevented direct dissolution of the retardant agent into the electrolyte, which would otherwise have negative effects on battery performance. During thermal runaway of the lithium-ion battery, the protective polymer shell would melt, triggered by the increased temperature, and the flame retardant would be released, thus effectively suppressing the combustion of the highly flammable electrolytes.

Keywords
  • Lithium ion batteries
  • flame-retardant
  • smart separator
  • thermal responsive

This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.

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