부산대학교 도서관

A novel solid-state block copolymer (i.e., poly(urethane-b-siloxane, PUSR) electrolyte for lithium metal battery was designed and prepared. The structures of PUSR copolymer and PUSR-based solid polymer electrolytes (SPEs) were characterized by FT-IR and XPS, respectively; the physical properties, mechanical, thermal and electrochemical performances of the SPEs were also investigated. It was shown that the types of lithium salt and their contents in the SPEs had a significant impact on the performances of PUSR-based electrolytes. For most PUSR-based SPEs, the maximum fracture elongation ratio and maximum fracture intensity can be up to 170% and 5 MPa, respectively; and the thermal decomposition temperature is above 320 °C. For the PUSR-LiBOB40 SPE, its ion conductivity (σ), Li ionic transference number ( t Li + ) and electrochemical window reach 1.5 × 10−4S cm−1, 0.80 and over 5.0 V at room temperature, respectively. The evaluation on the lithium metal battery (LMB) assembled with PUSR-LiBOB40 electrolyte demonstrates that PUSR-based electrolyte was a promising and potential SPE candidate for lithium metal battery with high energy and power density, high stability and long-life. This work paves a new way for development of advanced SPE for LMBs. [ABSTRACT FROM AUTHOR]