Abstract
Cross-linked solid polymer electrolytes (SPEs) based on ion-conducting poly(ethylene glycol) (PEG), flexible polysiloxane, and anion-trapping boron cross-linker (BPC) were prepared via thiol-ene click reaction for lithium metal batteries. Various thermal and electrochemical properties of SPEs were systematically investigated by varying the content of BPC. Thermally stable free-standing SPE systems could be obtained due to the cross-linked structure, while relatively high ionic conductivity of about 1.3 × 10−4 S cm−1 at 60 °C was obtained at the same time by the flexible polysiloxane moiety. The boron moiety in BPC could increase the lithium ion transference number compared to the corresponding boron-free SPE due to the anion-trapping capability of boron atom. The formation and growth of lithium dendrites were effectively suppressed by the anion-trapping capability and mechanically stable cross-linked structure of the SPE.
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