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Nanomaterials for Electrolytes in Electrochemical Devices

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Dear Colleagues,

In recent years, the rapid development of all-solid-state electrochemical devices has attracted the emergence of new nanostructured electrolytes that are commonly used in solid-state Li batteries, supercapacitors, sensors, fuel cells, Li-air, and Li–S batteries. Ideal electrolytic materials should exhibit several important properties: high ionic conductivity at room temperature, low electronic conductivity preventing self-discharge, a wide electrochemical potential window, good chemical stability towards electrodes, a high transference number, no crystal structure phase transformation, etc.

The specific challenge of this Special Issue is to outline the progress made on the nanostructured electrolytes in electrochemical devices with various chemical compositions (inorganic oxides and sulfides, polymers, and composites). Indeed, it is essential to pay attention to the manufacturing technology and the experimental conditions, such as the effects of pressure and operating parameters, on the electrochemical storage performance and mechanical properties. The electrolyte/electrode interfacial mechanisms and the detailed degradation mechanism of the electrolyte membrane under electrochemical conditions can be also covered. For this reason, it is with great pleasure that we invite authors to submit original research papers or reviews to this Special Issue.

Prof. Dr. Christian Julien
Prof. Dr. Alain Mauger
Guest Editors

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Keywords

all-solid-state batteries
solid electrolytes
nanomaterials
ionic conductivity
lithium batteries
sodium batteries
lithium-sulfur batteries
electrode-electrolyte interface

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Research

21 pages, 6345 KiB

Open AccessArticle

Exploiting Nanoscale Complexion in LATP Solid-State Electrolyte via Interfacial Mg²⁺ Doping

by Sina Stegmaier, Karsten Reuter and Christoph Scheurer

Nanomaterials 2022, 12(17), 2912; https://doi.org/10.3390/nano12172912 - 24 Aug 2022

Cited by 3 | Viewed by 1864

Abstract

While great effort has been focused on bulk material design for high-performance All Solid-State Batteries (ASSBs), solid-solid interfaces, which typically extend over a nanometer regime, have been identified to severely impact cell performance. Major challenges are Li dendrite penetration along the grain boundary network of the Solid-State Electrolyte (SSE) and reductive decomposition at the electrolyte/electrode interface. A naturally forming nanoscale complexion encapsulating ceramic Li

_{1 + x}

_{x}

_{2 - x}

(PO

_{4}

)

_{3}

(LATP) SSE grains has been shown to serve as a thin protective layer against such degradation mechanisms. To further exploit this feature, we study the interfacial doping of divalent Mg

^{2 +}

into LATP grain boundaries. Molecular Dynamics simulations for a realistic atomistic model of the grain boundary reveal Mg

^{2 +}

to be an eligible dopant candidate as it rarely passes through the complexion and thus does not degrade the bulk electrolyte performance. Tuning the interphase stoichiometry promotes the suppression of reductive degradation mechanisms by lowering the Ti

^{4 +}

content while simultaneously increasing the local Li

^{+}

conductivity. The Mg

^{2 +}

doping investigated in this work identifies a promising route towards active interfacial engineering at the nanoscale from a computational perspective. Full article

(This article belongs to the Special Issue Nanomaterials for Electrolytes in Electrochemical Devices)

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