Modification Strategies and Applications of Poly (ethylene oxide)-Based Solid-State Electrolytes
DOI:
https://doi.org/10.54097/d2jrbx58Keywords:
All-solid-state batteries, solid polymer electrolytes, poly (ethylene oxide), modification strategies.Abstract
The need for high-performance power batteries in the new energy vehicle sector is growing as a result of the global energy transition and the pursuit of carbon neutrality targets. Because organic electrolytes are inherently flammable and prone to leak, conventional lithium-ion batteries with liquid electrolytes have serious safety and energy density issues. All-solid-state lithium batteries are seen as a breakthrough for next-generation energy storage technologies because of their inherent safety and potentially high energy density. Solid polymer electrolytes (SPEs) have garnered a lot of interest as a crucial element among these. With its distinct molecular structure, remarkable ability to dissociate lithium salts, and outstanding processability, poly (ethylene oxide) (PEO) has become the most promising solid polymer electrolyte material for industrialization. However, the limited electrochemical stability window, low room-temperature ionic conductivity, and inadequate mechanical strength of PEO-based electrolytes prevent their widespread use. With a focus on three main areas—improving mechanical strength, expanding the electrochemical window, and enhancing ionic conductivity, this review highlights the state of research on PEO-based solid polymer electrolytes, evaluates their benefits and drawbacks, and suggest ways to modify them to overcome these obstacles. Lastly, the development tendencies of solid polymer electrolytes based on PEO are examined.
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