High-Modulus Hexagonal Boron Nitride Nanoplatelet Gel Electrolytes for Solid-State Rechargeable Lithium-Ion Batteries

Woo Jin Hyun, Ana C.M. De Moraes, Jin Myoung Lim, Julia R. Downing, Kyu Young Park, Mark Tian Zhi Tan, Mark C. Hersam

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Solid-state electrolytes based on ionic liquids and a gelling matrix are promising for rechargeable lithium-ion batteries due to their safety under diverse operating conditions, favorable electrochemical and thermal properties, and wide processing compatibility. However, gel electrolytes also suffer from low mechanical moduli, which imply poor structural integrity and thus an enhanced probability of electrical shorting, particularly under conditions that are favorable for lithium dendrite growth. Here, we realize high-modulus, ion-conductive gel electrolytes based on imidazolium ionic liquids and exfoliated hexagonal boron nitride (hBN) nanoplatelets. Compared to conventional bulk hBN microparticles, exfoliated hBN nanoplatelets improve the mechanical properties of gel electrolytes by 2 orders of magnitude (shear storage modulus â5 MPa), while retaining high ionic conductivity at room temperature (>1 mS cm-1). Moreover, exfoliated hBN nanoplatelets are compatible with high-voltage cathodes (>5 V vs Li/Li+) and impart exceptional thermal stability that allows high-rate operation of solid-state rechargeable lithium-ion batteries at temperatures up to 175 °C.

Original languageEnglish
Pages (from-to)9664-9672
Number of pages9
JournalACS nano
Volume13
Issue number8
DOIs
Publication statusPublished - Aug 27 2019

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Keywords

  • electrochemical stability
  • gel electrolyte
  • hexagonal boron nitride
  • ionic liquid
  • lithium-ion battery
  • mechanical modulus
  • thermal stability

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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