Enhanced ionic conductivity with Li7O2Br3 phase in Li3OBr anti-perovskite solid electrolyte

Authors

Jinlong Zhu, University of Nevada, Las VegasFollow
Shuai Li, University of Nevada, Las Vegas
Yi Zhang, University of Nevada, Las Vegas
John W Howard, University of Nevada, Las VegasFollow
X Lü, Los Alamos National Laboratory
Y Li, University of TexasFollow
Yonggang Wang, University of Nevada, Las VegasFollow
Ravhi Kumar, University of Nevada, Las VegasFollow
Liping Wang, University of Nevada, Las VegasFollow
Yusheng Zhao, University of Nevada, Las VegasFollow

Document Type

Article

Publication Date

1-1-2016

Publication Title

Applied Physics Letters

Volume

109

Issue

10

Abstract

Cubic anti-perovskites with general formula Li3OX (X = Cl, Br, I) were recently reported as superionic conductors with the potential for use as solid electrolytes in all-solid-state lithium ion batteries. These electrolytes are nonflammable, low-cost, and suitable for thermoplastic processing. However, the primary obstacle of its practical implementation is the relatively low ionic conductivity at room temperature. In this work, we synthesized a composite material consisting of two anti-perovskite phases, namely, cubic Li3OBr and layered Li7O2Br3, by solid state reaction routes. The results indicate that with the phase fraction of Li7O2Br3 increasing to 44 wt. %, the ionic conductivity increased by more than one order of magnitude compared with pure phase Li3OBr. Formation energy calculations revealed the meta-stable nature of Li7O2Br3, which supports the great difficulty in producing phase-pure Li7O2Br3 at ambient pressure. Methods of obtaining phase-pure Li7O2Br3 will continue to be explored, including both high pressure and metathesis techniques. © 2016 Author(s).

Language

English

Repository Citation

Zhu, J., Li, S., Zhang, Y., Howard, J., Lü, X., Li, Y., Wang, Y., Kumar, R., Wang, L., Zhao, Y. (2016). Enhanced ionic conductivity with Li7O2Br3 phase in Li3OBr anti-perovskite solid electrolyte. Applied Physics Letters, 109(10),
http://dx.doi.org/10.1063/1.4962437