Lithium Conductivity and Ions Dynamics in LiBH4/SiO2 Solid Electrolytes Studied by Solid-State NMR and Quasi-Elastic Neutron Scattering and Applied in Lithium Sulfur Batteries

Lefevr, Jessica and Cervini, Luca and Griffin, John M. and Blanchard, Didier (2018) Lithium Conductivity and Ions Dynamics in LiBH4/SiO2 Solid Electrolytes Studied by Solid-State NMR and Quasi-Elastic Neutron Scattering and Applied in Lithium Sulfur Batteries. The Journal of Physical Chemistry C, 122 (27). pp. 15264-15275. ISSN 1932-7447

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Abstract

Composite solid-state electrolytes based on ball milled LiBH4/SiO2 aerogel exhibit high lithium conductivities, and we have found an optimal weight ratio of 30/70 wt % LiBH4/SiO2 with a conductivity of 0.1 mS cm(-1) at room temperature. We have studied the Li+ and BH4 dynamics using quasi-elastic neutron scattering and solid-state nuclear magnetic resonance and found that only a small fraction (similar to 10%) of the ions have high mobilities, whereas most of the LiBH4 shows behavior similar to macrocrystal line material. The modified LiBH4 is formed from interaction with the SiO2 surface and most probably from reaction with the surface silanol groups. We successfully applied these composite electrolytes in lithium-sulfur solid-state batteries. The batteries show reasonable capacity retention (794 mAh g(-1) sulfur after 10 discharge-charge cycles, Coulombic efficiency of 88.8 +/- 2.7%, and average capacity loss of 7.2% during the first 10 cycles).

Item Type:
Journal Article
Journal or Publication Title:
The Journal of Physical Chemistry C
Additional Information:
This document is the Accepted Manuscript version of a Published Work that appeared in final form in The Journal of Physical Chemistry C, copyright ©2018 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acs.jpcc.8b01507
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2500/2504
Subjects:
ID Code:
126800
Deposited By:
Deposited On:
09 Aug 2018 15:16
Refereed?:
Yes
Published?:
Published
Last Modified:
25 Sep 2020 03:50