Janus Solid Electrolyte with Ionic and Electronic Dual Conductive Face Guiding Lithium Deposition Oriental To Connect with Lithium Metal Anode

Abstract

Polymer solid electrolytes show facile flexibility and processability, but the trade-off between ionic conductivity and lithium dendrite inhibition ability restricts their practical applications. Herein, polyacrylonitrile (PAN)/carbon nanotube (CNT) with one face electronic conductive membrane is merged with in situ polymerized ionic conductive polyethylene glycol diacrylate (PEGDA)/ethylene carbonate (EC)/dimethylcarbamide (DMC)/lithium bistrifluoromethane sulfonimide (LiTFSI) to construct Janus solid electrolyte PAN/CNT@PEDL. The ionic conductive face of PAN@PEDL is responsible for transporting Li⁺ and separating the cathode/anode. The other face of PAN-CNT@PEDL with ionic and electronic conductive peculiarity transports Li⁺ and electrons simultaneously, guiding Li⁺ deposition oriental in it and its interface connecting with the Li anode rather than puncturing electrolyte. The Janus solid electrolyte holds a high ionic conductivity of 3.48 mS cm^–1 at 30 °C and orientated Li⁺ deposition ability. Both Li||Li and LiFePO₄(LFP)||Li cells show improved cycling performances. The concept of Janus ionic/ionic and electronic conductive solid electrolytes proposes a new perspective for designing solid electrolytes.