Abstract
All-solid-state lithium batteries (ASSLB) are very promising for the future development of next generation lithium battery systems due to their increased energy density and improved safety. ASSLB employing Solid Polymer Electrolytes (SPE) and Solid Composite Electrolytes (SCE) in particular have attracted significant attention. Among the several expected requirements for a battery system (high ionic conductivity, safety, mechanical stability), increasing the energy density and the cycle life relies on the electrochemical stability window of the SPE or SCE. Most published works target the importance of ionic conductivity (undoubtedly a crucial parameter) and often identify the Electrochemical Stability Window (ESW) of the electrolyte as a secondary parameter. In this review, we first present a summary of recent publications on SPE and SCE with a particular focus on the analysis of their electrochemical stability. The goal of the second part is to propose a review of optimized and improved electrochemical methods, leading to a better understanding and a better evaluation of the ESW of the SPE and the SCE which is, once again, a critical parameter for high stability and high performance ASSLB applications.
Highlights
Considering that an accurate measurement of the electrochemical stability window is a key parameter for the development of all solid-state batteries, we propose in this work a literature overview that focuses on the evaluation of the electrochemical stabilities of Solid Polymer Electrolytes (SPEs) and their composites with ceramic/inorganic fillers (SCEs)
Amanchukwu et al [128] synthesized a new class of fluorinated ether electrolytes that combine the oxidative stability of hydrofluoroethers (HFEs) with the ionic be transferred to the evaluation of SPEs and Solid Composite Electrolytes (SCE)
Based on the experiments that have been discussed in the previous section, general remarks and conclusions can be made
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Even if a lot of progress has been made in recent years (for instance, efficient electric vehicles are presently available on the market), commercial batteries still need to be improved to achieve high energy and power densities while complying with safety requirements [2]. These current limitations are partly due to the restrictions imposed by electrode materials and due to the poor stability (thermal, chemical, electrochemical, etc.) of liquid electrolytes. Materials 2021, 14, 3840 dead weight, which results in an increase of the gravimetric and volumetric energy densities [4]
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