Nanocomposites of titanium dioxide and polystyrene-poly(ethylene oxide) block copolymer as solid-state electrolytes for lithium metal batteries

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Inna Gurevitch
  • Raffaella Buonsanti
  • Alexander A. Teran
  • Bernd Gludovatz
  • Jordi Cabana
  • Nitash P. Balsara

Detail(s)

Original languageEnglish
Pages (from-to)A1611-A1617
Journal / PublicationJournal of the Electrochemical Society
Volume160
Issue number9
Online published23 Jul 2013
Publication statusPublished - 2013
Externally publishedYes

Abstract

There is considerable interest in developing solid electrolytes for rechargeable lithium batteries as they have the potential to increase both energy density due to incorporation of a lithium metal anode and safety of batteries due to the fact that they are nonflammable. Block copolymers with a mechanically hard non-conducting block and a soft ion-conducting block provide an avenue for obtaining highly conducting rigid solids. In this study we add surface-modified TiO2 nanoparticles to a mixture of polystyrene-block-poly(ethylene oxide) and bis(trifluoromethane)sulfonimide lithium salt. The presence of BF4- moieties on the surface of the particles was essential for obtaining macroscopically homogeneous electrolytes; macrophase separation was observed with the same nanoparticles with surfaces covered with oleic acid. The stability of these composite electrolytes against lithium metal electrodes was tested in symmetric lithium-composite electrolyte-lithium cells. The surprising result was that electrolytes with 24 wt% nanoparticles exhibited optimum stability; the amount of charge passed before dendrite formation observed in the optimized composite electrolyte was a factor of 4.7 larger than that of the neat block copolymer electrolyte. Both tensile and shear moduli of the electrolytes were non-monotonic functions of particle concentration with peaks in the vicinity of 17 to 20 wt%.

Citation Format(s)

Nanocomposites of titanium dioxide and polystyrene-poly(ethylene oxide) block copolymer as solid-state electrolytes for lithium metal batteries. / Gurevitch, Inna; Buonsanti, Raffaella; Teran, Alexander A.; Gludovatz, Bernd; Ritchie, Robert O.; Cabana, Jordi; Balsara, Nitash P.

In: Journal of the Electrochemical Society, Vol. 160, No. 9, 2013, p. A1611-A1617.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review