A novel solid-state poly(urethane-b-siloxane) block copolymer-based electrolyte with flexibility and high ion transference number for lithium metal battery

作者：Wang, Pengcheng; Peng, Shunjin^*; Wu, Xiao; Wang, Dengjing; Zhang, Rengang

来源：Journal of Materials Science, 2022, 57(43): 20320-20334.

DOI：10.1007/s10853-022-07886-2

• POLYMER ELECTROLYTES
• SEGMENT CONTENT
• CONDUCTIVITY
• POLYSILOXANE
• CHALLENGES

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 degrees C. For the PUSR-LiBOB40 SPE, its ion conductivity (sigma), Li ionic transference number (t(Li+)) and electrochemical window reach 1.5 9 10(-4)S 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.