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Ionic Liquid Electrolytes for Energy Storage Devices

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Energy Materials".

Deadline for manuscript submissions: 20 September 2025 | Viewed by 1057

Special Issue Editor


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Guest Editor
1. School of Chemical Engineering, The University of Adelaide, Adelaide, SA 5005, Australia
2. Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD 4067, Australia
Interests: ionic liquids; electrolytes; batteries; supercapacitors; solid–electrolyte interphase; solid–liquid interface; lithium negative transference number; superionicity; ion correlations

Special Issue Information

Dear Colleagues,

Ionic liquids are salts in the liquid state that have unique properties such as low volatility, excellent electrochemical stability, and low toxicity compared to conventional ether or ester electrolytes. Their tunable cation and anion chemistry greatly influences the physical–chemical properties of these electrolytes; hence, it is important to understand structure–property relationships between ionic liquids and their electrochemical behavior. Recently, ionic liquid electrolytes demonstrated excellent suitability for their application in rechargeable batteries and supercapacitors. Uncommon phenomena such as lithium negative transference, superionicity, interfacial electrofreezing, etc. take place with these electrolytes, making it crucial to understand the hidden rules for better electrolyte design even beyond ionic liquids themselves.

We are pleased to invite you to contribute your research to the Special Issue “Ionic Liquid Electrolytes for Energy Storage Devices” of MDPI Materials (IF:3.1 (2023)).

This Special Issue aims to communicate recent discoveries related to the applications of ionic liquids in energy storage. In this Special Issue, original research articles, perspectives, and reviews are welcome. Research areas may include (but are not limited to) the following: synthesis of ionic liquids, physical–chemical properties of ionic liquids, batteries and supercapacitors with ionic liquid electrolytes, fundamentals of ion transport in related electrolytes, etc.

We look forward to receiving your contribution.

Dr. Dmitrii A. Rakov
Guest Editor

Manuscript Submission Information

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Keywords

  • ionic liquids
  • electrolytes
  • batteries
  • supercapacitors
  • solid–electrolyte interphase
  • solid–liquid interface
  • lithium negative transference number
  • superionicity
  • ion correlations

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Published Papers (1 paper)

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Research

14 pages, 4418 KiB  
Article
Controlling the All-Solid Surface Reaction Between an Li1.3Al0.3Ti1.7(PO4)3 Electrolyte and Anode Through the Insertion of Ag and Al2O3 Nano-Interfacial Layers
by Gwanhee Song, Bojoong Kim, Inkook Hwang, Jiwon Kim, Jinmo Kim and Chang-Bun Yoon
Materials 2025, 18(3), 609; https://doi.org/10.3390/ma18030609 - 29 Jan 2025
Viewed by 817
Abstract
Solid-state lithium batteries are considered ideal due to the safety of solid-state electrolytes. The Na superionic conductor-type Li1.3Al0.3Ti1.7(PO4)3 (LATP) is a solid electrolyte with high ionic conductivity, low cost, and stability. However, LATP is [...] Read more.
Solid-state lithium batteries are considered ideal due to the safety of solid-state electrolytes. The Na superionic conductor-type Li1.3Al0.3Ti1.7(PO4)3 (LATP) is a solid electrolyte with high ionic conductivity, low cost, and stability. However, LATP is reduced upon contact with metallic lithium, leading to lithium dendrite growth on the anode during charging. In this study, LATP was synthesized, and the relationship between crystallinity and ionic conductivity was investigated at different heat treatment temperatures. Optimal sintering conditions and ionic conductivity were analyzed for sintering temperatures from 800 to 1000 °C. To suppress reactions with Li metal, 50 nm thick Ag and 10 nm thick Al2O3 layers were deposited on LATP via DC sputtering and plasma-enhanced atomic layer deposition. The electrochemical stability was tested under three conditions: uncoated LATP, Al2O3-coated LATP, and Ag+Al2O3-coated LATP. The stability improved in the following order: uncoated < Al2O3-coated < Ag+Al2O3-coated. The Al2O3 coating suppressed secondary phase formation by preventing direct contact between LATP and Li, while Ag coating mitigated charge concentration, inhibiting dendrite growth. These findings demonstrate that Ag and Al2O3 nano-layers enhance electrolyte stability, advancing solid-state battery reliability and commercialization. Full article
(This article belongs to the Special Issue Ionic Liquid Electrolytes for Energy Storage Devices)
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