%0 Journal Article %A Bergfelt, Andreas %A Hernández, Guiomar %A Mogensen, Ronnie %A Lacey, Matthew J. %A Mindemark, Jonas %A Brandell, Daniel %A Bowden, Tim Melander %D 2020 %T Mechanically Robust Yet Highly Conductive Diblock Copolymer Solid Polymer Electrolyte for Ambient Temperature Battery Applications %U https://acs.figshare.com/articles/journal_contribution/Mechanically_Robust_Yet_Highly_Conductive_Diblock_Copolymer_Solid_Polymer_Electrolyte_for_Ambient_Temperature_Battery_Applications/11608338 %R 10.1021/acsapm.9b01142.s001 %2 https://ndownloader.figshare.com/files/21009708 %K polymer electrolyte %K Conductive Diblock Copolymer %K conductivity %K Ambient Temperature Battery Applications %K transference number %K 300 cycles %K BCT %K Polymer Electrolyte %K load-bearing constructions %K 0.2 GPa %K next-generation all-solid-state batteries %K SPE %K storage modulus %K electrolyte material %K benzyl methacrylate %K Mechanically Robust %X In this paper we present a solid polymer electrolyte (SPE) that uniquely combines ionic conductivity and mechanical robustness. This is achieved with a diblock copolymer poly­(benzyl methacrylate)-poly­(ε-caprolactone-r-trimethylene carbonate). The SPE with 16.7 wt % lithium bis­(trifluoromethanesulfonyl)­imide (LiTFSI) showed the highest ionic conductivity (9.1 × 10–6 S cm–1 at 30 °C) and apparent transference number (T+) of 0.64 ± 0.04. Due to the employment of the benzyl methacrylate hard block, this SPE is mechanically robust with a storage modulus (E′) of 0.2 GPa below 40 °C, similar to polystyrene, thus also making it a suitable material for load-bearing constructions. The cell Li|SPE|LiFePO4 is able to cycle reliably at 30 °C for over 300 cycles. The promising mechanical properties, desired for compatibility with Li-metal, together with the fact that BCT is a highly reliable electrolyte material makes this SPE an excellent candidate for next-generation all-solid-state batteries. %I ACS Publications