A Mechanically Robust In-Situ Solidified Polymer Electrolyte for SiOx-Based Anodes Toward High-Energy Lithium Batteries

• Inspired by dragonfly wing microstructure, a phase-separated in-situ solidified polymer electrolyte (PPM-PE) is developed, achieving superior mechanical robustness. • PPM-PE effectively suppresses SiOx electrode volume expansion and stabilizes the solid electrolyte interphase, reducing electrolyte decomposition. • The polymer electrolyte significantly enhances cycling and rate performance of SiOx-based anodes in both button and soft-package full cells. • This bio-inspired design philosophy offers a promising pathway for practical high-energy lithium batteries with SiOx anodes.