The Nancy & Stephen Grand Technion Energy Program, Technion-Israel Institute of Technology, Haifa, 3200003 (Israel).
Angew Chem Int Ed Engl. 2015 Jan 7;54(2):436-40. doi: 10.1002/anie.201408008. Epub 2014 Oct 5.
Non-aqueous lithium-oxygen batteries are considered as most advanced power sources, albeit they are facing numerous challenges concerning almost each cell component. Herein, we diverge from the conventional and traditional liquid-based non-aqueous Li-O2 batteries to a Li-O2 system based on a solid polymer electrolyte (SPE-) and operated at a temperature higher than the melting point of the polymer electrolyte, where useful and most applicable conductivity values are easily achieved. The proposed SPE-based Li-O2 cell is compared to Li-O2 cells based on ethylene glycol dimethyl ether (glyme) through potentiodynamic and galvanostatic studies, showing a higher cell discharge voltage by 80 mV and most significantly, a charge voltage lower by 400 mV. The solid-state battery demonstrated a comparable discharge-specific capacity to glyme-based Li-O2 cells when discharged at the same current density. The results shown here demonstrate that the safer PEO-based Li-O2 battery is highly advantageous and can potentially replace the contingent of liquid-based cells upon further investigation.
非水锂-氧电池被认为是最先进的电源，尽管它们几乎面临每个电池组件的众多挑战。在此，我们摒弃传统的基于液体的非水电锂-O2 电池，转向基于固体聚合物电解质（SPE）的 Li-O2 系统，该系统在高于聚合物电解质熔点的温度下运行，在此温度下，很容易获得有用且最适用的电导率值。通过动电位和恒电流研究，将基于所提出的 SPE 的 Li-O2 电池与基于乙二醇二甲醚（甘醇）的 Li-O2 电池进行了比较，结果表明电池放电电压高出 80 mV，更重要的是，充电电压低 400 mV。当以相同的电流密度放电时，固态电池表现出与甘醇基 Li-O2 电池相当的放电比容量。这里显示的结果表明，更安全的基于 PEO 的 Li-O2 电池具有很大的优势，并且在进一步研究后有可能取代基于液体的电池。
