Electrolytes hold the key for enabling various battery chemistries including solid state batteries.
Currently, the electrolyte based on using LiPF6 as salt and ethylene carbonate/dimethyl carbonate as solvents have been very successful for applications under normal conditions.
However, extreme conditions can arise from using batteries during very cold weather or increasing the charge voltage limit to increase overall energy density. Conventional electrolytes fail under these conditions because they cannot support effective lithium ion transport across the electrolyte and the interphase.
@Enyaun Hu et at @Brookhaven National Laboratory has been working on developing novel electrolytes for extreme conditions by engineering the solvent and the electrolyte additives.
In the following slides we give us a sneak peak view of the latest two insights obtained by taking advantage of the local synchrotron facility, which enables to characterize the electrolyte and the interphase with techniques that are beyond the reach of lab-based tools.
Much more will be presented at TechBlick’s event on (a) Frontier Battery Materials and (b) Solid-State Battery Materials on 15-16 Feb 2023 online. https://www.techblick.com/event/batterymaterials
In particular, it will be shown how
✔️ isoxazole-based electrolytes in Li | SPAN batteries can improve performance at ultra low temperatures (e.g., -30C) despite having lower bulk conductivity. Here, the origins are studies using XAS and XRF imaging, attributing it to interphase properties
✔️ 1-2% of additives to commercial LiPO2F2 electrolyte can enable high voltage performance, even under 4.8V. This is important, for example, in enabling nickel-rich layered cathode materials to be used in SSBs with Li metal anodes.
These are important developments which further the art, enabling high performance solid state batteries with, for example, Li metal anodes and Ni-rich layered cathodes, to also perform well in extreme temperature and bias voltage conditions.
Much more will be presented at TechBlick’s event on (a) Frontier Battery Materials and (b) Solid-State Battery Materials on 15-16 Feb 2023 online. https://www.techblick.com/event/batterymaterials
Comments