Abstract

Solid electrolytes have been actively researched for rechargeable lithium batteries, but low ion conductivity (σ) and the growth of lithium dendrites hinder their practical applications. This study synthesizes a composite solid electrolyte combining polyethylene oxide (PEO) with Li7La3Zr2O12 nanofibers (LLZO NFs) and quenching in liquid nitrogen. The LLZO NFs efficiently increase the σ and mechanical strength of composite polymer electrolytes (CPEs), thereby promoting the uniform deposition of lithium metal and inhibiting the growth of lithium dendrites. More importantly, the quenching markedly reduces the crystallinity of the electrolyte, which further enhances the ionic conductivity even at 30 °C. The CPEs exhibit high σ (1.09 × 10−4 S cm−1 at 30 °C) and enlarged electrochemical window (up to 5 V vs. Li/Li+). An integrated all-solid-state lithium metal battery (ASSLMBs) (labeled as LiFePO4|PEO/LLZO NFs/LiTFSI-q|Li) delivers high initial discharge capacity (138.8 mAh g−1) and excellent cycling stability (74.8% at 0.5C after 300 cycles) with remarkable capacity retention (84.0% at 1C after 200 cycles) at 45 °C. This strategy enables the promotion and application of ASSLMBs at room temperature.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.