Issue 10, 2018

Will the competitive future of solid state Li metal batteries rely on a ceramic or a composite electrolyte?

Abstract

The industrial development of Li metal solid state batteries will be boosted not only by providing highly Li+ conductive electrolyte materials, but also by demonstrating their technical viability in the actual device. For the first time, the electrochemical performances of two different electrolytes, a pure Li7La3Zr2O12 ceramic and a polymer–ceramic composite, are compared in a solid state battery with a Li metal anode and a LiFePO4 cathode. No liquid or gel additive was added to improve the interfacial contacts. The technological viability of these two systems was assessed under realistic cycling conditions with a competitive cathode loading of 1 mA h cm−2. Here, we show promising performances for both electrolytes at 70 °C under slow cycling rates; however, the composite stands out under fast cycling rates due to enhanced interfacial contacts. The energy density of the two systems is compared to the electric vehicle industry targets providing clear specifications for future system development.

Graphical abstract: Will the competitive future of solid state Li metal batteries rely on a ceramic or a composite electrolyte?

Supplementary files

Article information

Article type
Paper
Submitted
11 Jun 2018
Accepted
11 Aug 2018
First published
24 Aug 2018

Sustainable Energy Fuels, 2018,2, 2325-2334

Will the competitive future of solid state Li metal batteries rely on a ceramic or a composite electrolyte?

A. Gutiérrez-Pardo, A. I. Pitillas Martinez, L. Otaegui, M. Schneider, A. Roters, A. Llordés, F. Aguesse and L. Buannic, Sustainable Energy Fuels, 2018, 2, 2325 DOI: 10.1039/C8SE00273H

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