Abstract
A novel solid polymer electrolyte (SPE) composed of a mono-hydroxysiloxane-capped polyethylene oxide (PEO) polyurethane-cellulose acetate (PU-CA) blend was designed and successfully synthesized. An orthogonal test was conducted to investigate the influence of certain factors, such as the molar ratio of EO to Li, PEO molecular weight, and CA addition ratio, on the ionic conductivity of the SPEs using grey co-relationship theory. Specifically, for the PU-CA-LiBOB polymeric solid electrolytes prepared with a PEO to CA mass ratio of 10:1 and an ethylene oxide (EO) to Li⁺ molar ratio of 16:1, its ionic conductivity, electrochemical window, and Li+ transference number were measured to be 2.5 × 10−5 S/cm, 4.7 V, and 0.33 at room temperature, respectively. Among the various lithium salts studied (i.e. LiBOB, LiBF4, LiTFSI, and LiNO3), LiBOB exhibited greater compatibility with the siloxane-capped PEO polyurethane polymer host. The experimental results indicate that the PU-CA-based electrolyte is a promising and competitive SPE candidate material with a high ion transference number, which would pave a new route for advancing SPE technology in Lithium metal batteries (LMBs).
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