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Poly(ethylene oxide) (PEO)-based polymer electrolyte is regarded as a promising candidate for solid-state lithium metal batteries due to its unique lithium conduction mechanism compared to inorganic solid-state electrolyte. However, the development of this electrolyte is hindered by its low ionic conductivity and poor mechanical strength. In this study, we enhance the mechanical stability and ionic conductivity of PEO-based polymer electrolyte by incorporating barium titanate nanoparticles coated with 3-(triethoxysilyl) propionitrile (BTO@TESPN) as solid fillers. With 10 wt% of BTO@TESPN, ionic conductivity and critical current density at 60 C is improved to 5.67  10-4 S cm-2 and 1.6 mA cm-2, respectively, compared to 2.69  10-4 S cm-2 and 1.0 mA cm-2 without the filler. Furthermore, the symmetric cell with Li utilizing this electrolyte demonstrates stable cycling at a rate of 0.1 mA cm-2 for a minimum duration of 1000 h. Additionally, the lithium iron phosphate (LiFePO4)-Li battery exhibits excellent stability up to 700 cycles at 60 C at a current rate of 0.5 C while maintaining a capacity retention of up to 93.0%. This research presents an innovative approach towards enhancing PEO-based solid polymer electrolytes, by regulating the interface between the filler and the polymer matrix.

権利情報:

• In Copyright
  

キーワード: Solid polymer electrolyte, poly(ethylene oxide), barium titanate, surface coating, lithium-metal battery

刊行年月日: 2025-03-04

出版者: Royal Society of Chemistry (RSC)

掲載誌:

• JOURNAL OF MATERIALS CHEMISTRY A (ISSN: 20507488) vol. 13 p. 9453-9461

研究助成金:

• National Institute for Materials Science

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5388

公開URL: https://doi.org/10.1039/d5ta00072f

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更新時刻: 2026-03-05 08:30:04 +0900

MDRでの公開時刻: 2026-03-04 18:12:08 +0900