Speaker
Description
Composite solid polymer electrolytes (CSPEs) have emerged as promising candidates for next-generation all-solid-state lithium batteries (ASSLBs). However, the limited ionic conductivity and poor interphase stability have seriously hindered their practical application. Herein, the anion-trapping layered double hydroxide (LDH) was introduced to simultaneously enhance ionic conductivity and interfacial compatibility in poly(ethylene oxide) (PEO)-based CSPEs for stabilizing lithium metal anodes. The optimized composite electrolyte significantly enhances lithium-ion transport and deposition behaviors, resulting in a uniform Li+ flux distribution and consequently homogeneous lithium plating. As a result, the Li||Li symmetric cell achieves exceptional cycling stability and superior overpotential. Importantly, operando nano-focus Wide-angle X-ray scattering (nWAXS) was employed to spatially map the distribution of both the solid electrolyte interphase (SEI) layer and lithium dendrites across micron-scale lateral and vertical dimensions. The results indicate that the LDH-enhanced composite electrolyte not only effectively suppresses the growth of lithium dendrites by ensuring a uniform lithium-ion flux distribution but also enables the formation of a superior multifunctional SEI. Therefore, this study provides a novel strategy for designing high-performance CSPEs with stabilized interfaces and establishes an innovative approach for real-time visualization of SEI evaluation and dendrite growth in ASSLBs.
