Abstract

AbstractLithium‐sulfur (Li‐S) battery shows promising development potential in secondary lithium‐ion batteries. However, the shuttle effect of polysulfides, uncontrollable lithium dendrite growth, and safety hazards in conventional liquid electrolytes limit the popularity of Li‐S batteries in the future commercial market. In this work, a high‐performance gel electrolyte (GPE) was prepared in situ by initiating the ring‐opening polymerization of 1,3‐dioxolane (DOL) with aluminum trifluoromethanesulfonate (Al(OTf)3) and using diethylene glycol dimethyl ether (DME) as a plasticizer, which can effectively improve the interfacial compatibility between sulfur cathode and the electrolyte, as well as the stability of lithium anode. The electrochemical performance of the poly‐DOL (PDOL) GPE was optimized by adjusting the concentration ratio of the initiator. When the concentration of Al(OTf)3 is 4 mM, the PDOL GPE has a high ionic conductivity up to 3.81 × 10−4 S cm−1 and a lithium ion migration number of 0.57. The assembled quasi‐solid‐state Li‐S batteries shows an initial discharge specific capacity of 908.1 mAh g−1 at 0.1 C with a capacity retention of 68% after 240 cycles, and its average Coulombic efficiency is maintained at 96.1%. This gel electrolyte design provides a feasible practical idea in quasi‐solid‐state Li‐S batteries.

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.