Preparation, characterization and properties of LaFeO3 perovskite electrocatalysts for lithium-oxygen battery

Abstract

高能量密度的锂氧电池是极具应用价值的下一代储能装置。目前,它的研究仍处于基础探索阶段。面临的关键问题包括氧气电极缓慢的反应动力学,放电过程中Li2O2等导电性较差的放电产物在电池氧气阴极沉积,导致锂氧电池的电化学极化过大、循环性能不稳定和倍率性能受限等。解决方法之一是构建高效的阴极电催化剂:一方面提高电催化剂的氧还原(ORR)和氧释放(OER)催化反应动力学;另一方面通过优化的结构设计促进电子传输、氧气扩散、电解液浸润和放电产物存储。 本文选择钙钛矿型化合物LaFeO3为主要研究对象。首先制备了LaFeO3纳米粒子(NP-LaFeO3),通过电化学方法研究了该电催化剂的本征催化活性;随后,针...Non-aqueous lithium-oxygen battery is a promising candidate for next generation energy storage due to its high specific capacity. Now its research still stay at fundamental exploration, and one of the most important problems is focused on the sluggish oxygen reaction kinetics. During the discharge process, masses of isolated products which are mainly consisted of lithium peroxide deposit on oxygen...学位:理学硕士院系专业:化学化工学院_物理化学学号:2052014115161

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