Abstract
Solid-state polymer electrolytes (SPEs) have great processing flexibility and electrode–electrolyte contact and have been employed as the promising electrolytes for lithium metal batteries. Among them, poly(ethylene oxide) (PEO)-based SPEs have attracted widespread attention because of easy synthesis, low mass density, good mechanical stability, low binding energy with lithium salts, and excellent mobility of charge carriers. In order to overcome the low room-temperature ionic conductivity and the poor thermodynamic stability in high-voltage devices (>4.2 V) of the PEO materials, composition modulations by incorporating PEO with inorganic and/or organic components have been designed, which could effectively enable the applications of PEO-based SPEs with widened electro-stable voltage ranges. In this mini review, we describe recent progresses of several kinds of PEO composite structures for SPEs, and we compare the synthesis strategies and properties of these SPEs in lithium batteries. Further developments and improvements of the PEO-based materials for building better rechargeable batteries are also discussed.
Highlights
Lithium ion batteries (LIBs) are critical for large-scale applications, including power sources for 3C electronics, portable devices, and electric vehicle (Liu et al, 2019b)
We review the recent progress in the synthesis strategies and polymer engineering of poly(ethylene oxide) (PEO)-based electrolytes
It is found that the increment of lithium salts within the polymeric matrix can lead to an improved ionic conductivity, accompanied by a degradation of mechanical strength and electro-stability of the PEO-based state polymer electrolytes (SPEs) (Lopez et al, 2019)
Summary
Lithium ion batteries (LIBs) are critical for large-scale applications, including power sources for 3C electronics, portable devices, and electric vehicle (Liu et al, 2019b). Future studies of PEO-based SPEs should focus on the improvement of the mechanical properties for preventing Li dendrite formation and increasing electrochemical stability of PEO-based SPEs. By compositing with inorganic solid oxides/organic molecules, as-obtained composite PEO-based polymer electrolytes show a high ionic conductivity and are stable under relative high voltage (Liang et al, 2019).
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