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

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 -5 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
JournalACS nano
DOIs
Publication statusAccepted/In press - Jan 1 2019

Fingerprint

Ionic Liquids
Boron nitride
Solid electrolytes
solid electrolytes
boron nitrides
Ionic liquids
Nitrides
Electrolytes
nitrides
electric batteries
Thermodynamic stability
thermal stability
Gels
lithium
electrolytes
gels
Ions
solid state
ions
microparticles

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)

Cite this

High-modulus hexagonal boron nitride nanoplatelet gel electrolytes for solid-state rechargeable lithium-ion batteries. / Hyun, Woo Jin; De Moraes, Ana C.M.; Lim, Jin Myoung; Downing, Julia R.; Park, Kyu Young; Tan, Mark Tian Zhi; Hersam, Mark C.

In: ACS nano, 01.01.2019.

Research output: Contribution to journalArticle

Hyun, Woo Jin ; De Moraes, Ana C.M. ; Lim, Jin Myoung ; Downing, Julia R. ; Park, Kyu Young ; Tan, Mark Tian Zhi ; Hersam, Mark C. / High-modulus hexagonal boron nitride nanoplatelet gel electrolytes for solid-state rechargeable lithium-ion batteries. In: ACS nano. 2019.
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