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

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, me...

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Bibliographic Details
Published in:Journal of materials science 2022-11, Vol.57 (43), p.20320-20334
Main Authors: Wang, Pengcheng, Peng, Shunjin, Wu, Xiao, Wang, Dengjing, Zhang, Rengang
Format: Article
Language:English
Subjects:
Batteries
Block copolymers
Characterization and Evaluation of Materials
Chemical compounds
Chemistry and Materials Science
Classical Mechanics
Crystallography and Scattering Methods
Electric properties
Electrolytes
Elongation
Energy Materials
Lithium
Lithium batteries
Materials Science
Molten salt electrolytes
Physical properties
Polyelectrolytes
Polymer Sciences
Room temperature
Siloxanes
Solid electrolytes
Solid Mechanics
Solid state
Thermal decomposition
Urethanes
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Summary: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 −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. Graphical abstract
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-022-07886-2