Abstract
Solid polymer electrolytes (SPEs) have attracted considerable attention due to the rapid development of the need for more safety and powerful lithium ion batteries. The prime requirements of solid polymer electrolytes are high ion conductivity, low glass transition temperature, excellent solubility to the conductive lithium salt, and good interface stability against Li anode, which makes PEO and its derivatives potential candidate polymer matrixes. This review mainly encompasses on the synthetic development of PEO-based SPEs (PSPEs), and the potential application of the resulting PSPEs for high performance, all-solid-state lithium ion batteries.
Highlights
Lithium-ion batteries (LIBs), as the most significant candidates for energy storage devices, have quickly occupied the global electrical consumer market due to their relatively high energy density, advanced operating voltage, and lack of a memory effect [1,2,3,4]
Tanaka et al [48] certified that the ionic conductivity of the poly(ethylene oxide) (PEO)–LiClO4 electrolyte blending with polyaziridine (PEI) is three orders of magnitude higher than that of the pure PEO–LiClO4 electrolyte
The ionic conductivity of the obtained PEI–PEO–LiClO4 electrolyte can reach 10−4 at room temperature. This was confirmed by the sharp decrease of ionic conductivity of the PEO–LiClO4 -based electrolyte caused by crystallization being efficiently suppressed
Summary
Lithium-ion batteries (LIBs), as the most significant candidates for energy storage devices, have quickly occupied the global electrical consumer market due to their relatively high energy density, advanced operating voltage, and lack of a memory effect [1,2,3,4]. Conventional LIBs with organic liquid electrolytes (OLEs) possess some inherent drawbacks, such as flammability, leakage, and environmental toxicity, which hinder their application in Electric Vehicles (EVs) or air-planes who need energy storage devices with high energy densities and, more importantly, high safety [5,6,7,8]. Inorganic solid electrolytes have superior ion conductivity and high Li+ transference numbers, their practical usage is still impeded by their defects, such as large grain boundary resistance, poor interface compatibility between inorganic solid electrolyte and electrode, relatively cumbersome fabrication process, and large energy barrier for lithium ion electrolyte migration in electrode interface These features will cause a series of problems, especially the growth of lithium dendrites during the charging–discharging process [19,20,21]. Various methods have been adopted to synthesize PSPEs with good mechanical properties, superior electrochemical stability, and especially, high ion conductivity [29,30]
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