Issue

Vol. 16 (2024)

Trend of Developing Aqueous Liquid and Gel Electrolytes for Sustainable, Safe, and High-Performance Li-Ion Batteries

https://doi.org/10.1007/s40820-023-01220-4
Donghwan Ji
School of Chemical Engineering, Sungkyunkwan University (SKKU), Suwon 16419, Republic of Korea
http://orcid.org/0000-0003-2266-1654
Jaeyun Kim
School of Chemical Engineering, Sungkyunkwan University (SKKU), Suwon 16419, Republic of Korea
http://orcid.org/0000-0002-4687-6732

Corresponding Author: Jaeyun Kim

kimjaeyun@skku.edu

Nano-Micro Letters, Vol. 16 (2024), Article Number: 2

Abstract

Current lithium-ion batteries (LIBs) rely on organic liquid electrolytes that pose significant risks due to their flammability and toxicity. The potential for environmental pollution and explosions resulting from battery damage or fracture is a critical concern. Water-based (aqueous) electrolytes have been receiving attention as an alternative to organic electrolytes. However, a narrow electrochemical-stability window, water decomposition, and the consequent low battery operating voltage and energy density hinder the practical use of aqueous electrolytes. Therefore, developing novel aqueous electrolytes for sustainable, safe, high-performance LIBs remains challenging. This Review first commences by summarizing the roles and requirements of electrolytes–separators and then delineates the progression of aqueous electrolytes for LIBs, encompassing aqueous liquid and gel electrolyte development trends along with detailed principles of the electrolytes. These aqueous electrolytes are progressed based on strategies using superconcentrated salts, concentrated diluents, polymer additives, polymer networks, and artificial passivation layers, which are used for suppressing water decomposition and widening the electrochemical stability window of water of the electrolytes. In addition, this Review discusses potential strategies for the implementation of aqueous Li-metal batteries with improved electrolyte–electrode interfaces. A comprehensive understanding of each strategy in the aqueous system will assist in the design of an aqueous electrolyte and the development of sustainable and safe high-performance batteries.


Highlights:
1 This Review encompasses the role, requirement, and development direction of water-based electrolytes for sustainable, safe, high-performance Li-ion batteries.
2 Water-based electrolytes (aqueous liquid and gel electrolytes) and their mechanisms are comprehensively summarized to widen the electrolyte electrochemical stability window and battery operating voltage and to achieve long-term operation stability.

Keywords

Lithium-ion battery (LIB) Aqueous electrolyte Gel electrolyte Electrochemical stability window Li dendrite
Ji, Donghwan, and Jaeyun Kim. 2023. “Trend of Developing Aqueous Liquid and Gel Electrolytes for Sustainable, Safe, and High-Performance Li-Ion Batteries”. Nano-Micro Letters 16 (November):2. https://doi.org/10.1007/s40820-023-01220-4.
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