固态锂空气电池的原位同步辐射研究

锂空气电池由于具有超高的理论能量密度，有潜力获得与汽油相比拟的能量密度，而备受关注。但是采用有机电解液的锂空气电池，面临由于电解液挥发以及充电分解而导致的发展瓶颈问题。不同于液体电解液，固体电解质不仅化学和电化学稳定性高，而且还有助于抑制锂负极枝晶生长，因此固态锂空气电池成为新的研究热点。当固体电解质取代液体电解液，固液界面转变为固固界面，锂空气反应则完全发生在固体表面，呈现出诸多新现象新机理。本项目正是针对固固界面所涉及的新的离子电子输运以及电化学反应机理，在多年研究固体电解质和固态锂电池的基础上，结合同步辐射先进技术，开展原位监测固态锂空气电池工作过程的前沿基础研究。预期能够揭示固体表界面锂空气反应机理，阐明影响电池性能的关键因素，从而获得提高电池性能的有效方案，推动高能量密度长循环固态锂空气电池的实用化进程。

The Li-air battery has attracted a great deal of attention owing to its ultrahigh theoretical energy density, which is comparable to that of gasolline in electric vehicle. However, its developement faces bottleneck problems arising from the volatile and unstable organic liquid electrolytes. Solid electrolytes are viewed as the good candidate to solve such problme due to their stability. Moreover, they are also helpful for depressing the lithium dendrite. Therefore, the solid state Li-air battery becomes the hot spot recently. As the solid state electrolytes replace the liquid electrolytes, the liquid/solid interfaces change to the solid/solid interfaces, resulting in many new phenomena and mechanisms. This project focus on these new issues of ionic/electronic transport and electrochemical reactions related to the solid/solid interfaces. Based on many-year research on the solid electrolytes and solid state batteries, we combine the advanced synchrotron technique to in-situ detect the operation process of solid state Li-air batteries. The aim is to disclose the mechanism of Li-air reaction on solid surfaces as well as at the solid interfaces, elucidate the key factors that influnce the electrochemical performance of the batteries. Consequently, the methode that can improve the performance can be obtained, paving the way for development of applicable Li-air batteries.