Abstract

The sluggish ion transportation, oxidation instability and severe lithium dendrites impede the development of solid-state lithium metal battery (SSLMBs). Herein, a novel structural design of in-situ polymerized composite electrolyte (CPE) with the utilization of both orientationally arranged and unilaterally sedimented Zeolitic imidazolate framework-67 (ZIF-67) fillers are reported. The in-situ growing of ZIF-67 crystals on 3D polyvinylidene fluoride (PVDF) nanofiber skeleton not only provides high-speed Li+ conduction pathway, but also promotes the antioxidative ability of surrounding polymer matrix by facilitating the ring-open polymerization of 1,3-Dioxolane (DOL) monomer to form long-chain PDOL. Meanwhile, ZIF-67 deposition layer constructed through the natural sedimentation of residual ZIF-67 during PVDF@ZIF-67 framework fabrication regulates surface Li+ flux towards lithium anode and further optimizes SEI composition. As a result, satisfactory ionic conductivity of 1.8 × 10−4 S cm−1 and oxidative potential of 5.9 V (vs. Li+/Li) are acquired for unilateral-sedimented ZIF-67/PDOL CPE (UZE). Encouragingly, symmetric Li battery based on UZE displays a superior stability over 2300 h at 0.1 mA cm−2 and a remarkable cycle durability with 92.5 % of capacity retained after 570 cycles at 2C is also achieved for Li||LFP battery. This study provides a novel guidance in engineering solid electrolyte with excellent ionic transport kinetics and interfacial compatibility for next-generation SSLMBs.

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.