Abstract
As a high-efficiency energy storage and conversion device, lithium-ion batteries have high energy density, and have received widespread attention due to their good cycle performance and high reliability. However, currently commercial lithium batteries usually use organic solutions containing various lithium salts as liquid electrolytes. In practical applications, liquid electrolytes have many shortcomings and shortcomings, such as poor chemical stability, flammability, and explosion. Therefore, the liquid electrolyte has a great safety hazard. The use of solid electrolyte ensures the safety of lithium-ion batteries, and has the advantages of high energy density, good cycle performance, long life, and wide electrochemical window, making the battery safer and more durable, with higher energy density and simple battery Structural design. Solid electrolytes mainly include inorganic solid electrolytes and organic polymer solid electrolytes. Although both inorganic solid electrolytes and polymer solid electrolytes have their own advantages, as far as the existing research work is concerned, whether it is an inorganic system or a polymer system, a single-system solid electrolyte can never achieve the full performance of an ideal solid electrolyte. The composite solid electrolyte composed of active or passive inorganic filler and polymer matrix is considered as a promising candidate electrolyte for all-solid-state lithium batteries. Among many polymer systems, PEO-based is considered to be the most ideal polymer substrate. In this review article, we first introduced the structure, properties, and preparation methods of PEO-based polymer electrolytes. Furthermore, the researches related to the modification of PEO-based polymer solid electrolytes in recent years are summarized. The contribution of polymer structural modification and the introduction of additives to the ionic conductivity, electrochemical stability and mechanical properties of PEO-based solid electrolytes is described. Examples of different composite solid electrolyte design concepts were extensively discussed, such as inorganic inert nanoparticles/PEO, oxide/PEO, and sulfide/PEO. Finally, the future development direction of composite solid electrolytes was prospected.
Highlights
Due to the advancement of the global industrialization process, the rapid economic development and the large consumption of fossil fuels, tremendous effort has been made to develop lowpolluting, environmentally friendly renewable energy (Sun et al, 2017; Chen et al, 2020; Ding et al, 2020)
In order to suppress the adverse effects of crystallization on ionic conductivity and enhance the mechanical strength to inhibit the growth of lithium dendrites, people have been committed to the development of new amorphous polymer matrix, including polymer blending, copolymerization, crosslinking, etc
composite SSEs (CSSEs) is a kind of polymer polyethylene oxide (PEO) as the matrix, by adding other substances to improve the performance of the PSSE, thereby forming a new CSSE
Summary
Due to the advancement of the global industrialization process, the rapid economic development and the large consumption of fossil fuels, tremendous effort has been made to develop lowpolluting, environmentally friendly renewable energy (Sun et al, 2017; Chen et al, 2020; Ding et al, 2020). SSEs have the advantages of high energy density, wide operating temperature range, long cycle life, and wide electrochemical window. SSEs display a high mechanical strength, which can effectively inhibit the short circuit caused by the generation and penetration of lithium dendrites (Wan et al, 2018; Zhang et al, 2021a). Inorganic solid electrolyte can maintain good chemical (electrochemical) stability, good mechanical strength, and wide electrochemical window in a wide temperature range. It can inhibit the growth of lithium dendrites and avoid battery short circuits (Zhang et al, 2020a; Huang et al, 2020). The structure, performance, preparation and other aspects of PEO polymer solid electrolyte are described
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