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Optimized Concentration of Redox Mediator and Surface Protection of Li Metal for Maintenance of High Energy Efficiency in Li–O_2 Batteries

机译:优化的氧化还原介体浓度和金属锂表面保护,以维持Li–O_2电池的高能效

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摘要

Recently, various approaches for adding redox mediators to electrolytes and introducing protective layers onto Li metal have been suggested to overcome the low energy efficiency and poor cycle life of Li-O-2 batteries. However, the catalytic effect of the redox mediator for oxygen evolution gradually deteriorates during repeated cycling owing to its decomposition at the surfaces of both the oxygen electrode (cathode) and the Li metal electrode (anode). Here, optimized Li-O-2 batteries are designed with a continuously effective redox mediator and a stable protective layer for the Li metal electrode by optimizing the LiBr concentration and introducing a graphene-polydopamine composite layer, respectively. These synergistic modifications lead to a reduction of the charge potential to below 3.4 V and significantly improve the stability and cycle life of Li-O-2 batteries. Consequently, a high energy efficiency of above 80% is maintained over 150 cycles. Herein, it is confirmed that the relationships between all the battery materials should be understood in order to improve the performance of Li-O-2 batteries.
机译:近来,已经提出了各种用于在电解质中添加氧化还原介体并将保护层引入到Li金属上的方法,以克服Li-O-2电池的低能量效率和较差的循环寿命。然而,由于氧化还原介体在氧电极(阴极)和锂金属电极(阳极)的表面上分解,因此在反复循环过程中,氧化还原介体对氧释放的催化作用逐渐恶化。在此,通过分别优化LiBr浓度和引入石墨烯-聚多巴胺复合层,设计出具有连续有效的氧化还原介体和稳定的锂金属电极保护层的优化Li-O-2电池。这些协同修饰可将充电电位降低至3.4 V以下,并显着提高Li-O-2电池的稳定性和循环寿命。因此,在150个循环中可保持80%以上的高能效。在此,证实了应当理解所有电池材料之间的关系以便改善Li-O-2电池的性能。

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