2026-03-05 スイス連邦材料試験研究所(EMPA)
Flexible: The solid silicone-based electrolyte is elastic, thereby compensating for the voids that form in solid-state batteries during charging and discharging. Image: Empa
＜関連情報＞
- https://www.empa.ch/web/s604/flexible-electrolytes-for-solid-state-batteries
- https://chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/cssc.202301285
高エネルギー密度固体リチウム電池用電解質としてのニトリル官能化ポリシロキサン Nitrile-functionalized Poly(siloxane) as Electrolytes for High-Energy-Density Solid-State Li Batteries
Faruk Okur, Dr. Yauhen Sheima, Can Zimmerli, Huanyu Zhang, Patrick Helbling, Ashling Fäh, Dr. Iacob Mihail, Jacqueline Tschudin, Prof. Dorina M. Opris, …
ChemSusChem Published: 05 December 2023
DOI:https://doi.org/10.1002/cssc.202301285
Abstract
In the quest to replace liquid Li-ion electrolytes with safer and non-toxic solid counterparts for Li-ion batteries, polysiloxane polymers have attracted considerable attention as they offer low glass transition temperatures, stability with metallic lithium, and versatility in chemical functionalization of the backbone. Herein, we present the synthesis of Li-ion conductive polysiloxane-based polymers functionalized with 60 % nitrile groups per chain unit. The synthesis procedure is based on the reaction of poly-(dimethylsiloxane-co-methylvinylsiloxane) polymer with 2-cyanoethanethiol, followed by the addition of lithium bis (trifluoromethanesulfonyl) imide. The presented polysiloxane-based polymers exhibit exceptionally high ionic conductivity up to 0.375 mS cm−1 at 60 °C and Li+ ion transfer number of 0.73, one of the highest reported for polymer Li-ion conducting electrolytes. Their electrochemical performance was evaluated in both symmetrical and full-cell configurations to test the utility of synthesized polymers as electrolytes in Li-ion batteries.
