Mechanically Robust Yet Highly Conductive Diblock Copolymer Solid Polymer Electrolyte for Ambient Temperature Battery Applications

Published on 2020-01-14T22:44:11Z (GMT) by
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<sup>–6</sup> S cm<sup>–1</sup> at 30 °C) and apparent transference number (<i>T</i><sub><i>+</i></sub>) of 0.64 ± 0.04. Due to the employment of the benzyl methacrylate hard block, this SPE is mechanically robust with a storage modulus (<i>E</i>′) 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|LiFePO<sub>4</sub> 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.

Cite this collection

Bergfelt, Andreas; Hernández, Guiomar; Mogensen, Ronnie; Lacey, Matthew J.; Mindemark, Jonas; Brandell, Daniel; et al. (2020): Mechanically Robust Yet Highly Conductive Diblock

Copolymer Solid Polymer Electrolyte for Ambient Temperature Battery

Applications. ACS Publications. Collection. https://doi.org/10.1021/acsapm.9b01142