Fluoroether Design Enables High-Voltage All-Solid-State Lithium Metal Batteries.
- Publisher:
- WILEY-V C H VERLAG GMBH
- Publication Type:
- Journal Article
- Citation:
- Adv Mater, 2025, pp. e2506020
- Issue Date:
- 2025-07-01
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Developing high-voltage all-solid-state lithium metal batteries (ASSLMBs) holds transformative potential for next-generation energy storage technologies but remains a formidable challenge. Herein, a new prototype design is presented that integrates fluorinated ether segments into the traditional oxide nanocomposite phase, enabling poly(ethylene oxide)-based composite electrolytes with exceptional anti-oxidation durability and enhance overall electrochemical performance. Through a combination of experimental and computational analyses, it is demonstrated that the superior performance is attributed to the formation of reconstructed Li⁺ solvation with weakly coordinating environments. The proposed formulation exhibits excellent Li-metal compatibility, enabling stable cycling in symmetric Li||Li cells for over 9500 h. The solid-state electrolyte also exhibits outstanding high-voltage stability with LiNi0.8Co0.1Mn0.1O2 cathodes, extending the operational voltage from 4.0 to 4.5 V. Moreover, the LiMn1-xFexPO4||Li cells have delivered remarkable cycling performance, achieving over 1200 cycles with 99% capacity retention after 500 cycles. This work establishes an innovative platform for designing electrolytes with superior antioxidation properties and enhance structural durability, paving the way for the advancement of high-voltage all-solid-state lithium metal batteries.
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