Additives Tailored Design for More Durable Polyethylene Oxide-Based Solid Electrolytes: A Crucial Review.

Area of Science:

• Materials Science
• Electrochemistry
• Polymer Science

Background:

• Poly (ethylene oxide) (PEO)-based solid polymer electrolytes (SPEs) are promising for all-solid-state lithium metal batteries (ASSLMBs) due to favorable mechanical and thermal properties.
• Key limitations include low room-temperature ionic conductivity, lithium dendrite growth, unstable solid electrolyte interphase (SEI) chemistry, and high-voltage decomposition.
• Current strategies like filler incorporation and molecular modification have not simultaneously resolved these issues.

Purpose of the Study:

• To review the challenges associated with PEO-based SPEs in ASSLMBs.
• To comprehensively analyze additive design concepts and their working mechanisms for PEO-SPEs.
• To highlight future research directions for additive strategies to enable safer and longer-lasting ASSLMBs.

Main Methods:

• Literature review focusing on additive strategies for PEO-based SPEs.
• Analysis of design concepts and working mechanisms of various additives.
• Discussion of challenges and future research directions in the field.

Main Results:

• Additive design is a successful and operable strategy to simultaneously improve ionic conductivity and regulate interfacial chemistry in PEO-SPEs.
• Various additives and their mechanisms have been explored to overcome the limitations of PEO-based SPEs.
• Additive strategies offer a viable path towards enhancing the performance and safety of ASSLMBs.

Conclusions:

• Tailoring additive designs is crucial for advancing PEO-based SPEs in ASSLMB applications.
• Further research into additive strategies is essential for developing safer, high-performance, and long-lasting solid-state batteries.
• This review provides insights into current additive approaches and future prospects for PEO-SPEs.