Yu Haohan, Liu Dapeng, Fu Zerui, Wang Shu, Zuo Xintao, Feng Xilan, Zhang Yu
Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing, 100191, P. R. China.
Department of Automation Science and Electrical Engineering, Beihang University, Beijing, 100191, P. R. China.
Angew Chem Int Ed Engl. 2024 Apr 15;63(16):e202401272. doi: 10.1002/anie.202401272. Epub 2024 Mar 6.
Widely acknowledged that the capacity of Li-O batteries (LOBs) should be strongly determined by growth behaviors of the discharge product of lithium peroxide (LiO) that follows both coexisting surface and solution pathways. However until now, it remains still challenging to achieve dynamic modulation on LiO morphologies. Herein, the photo-responsive Au nanoparticles (NPs) supported on reduced oxide graphene (Au/rGO) have been utilized as cathode to manipulate oxygen reduction reaction (ORR) kinetics by aid of surface plasmon resonance (SPR) effects. Thus, we can experimentally reveal the importance of matching ORR kinetics with Li migration towards battery performance. Moreover, it is found that Li concentration polarization caused "sudden death" of LOBs is supposed to be just a form of suspended animation that could timely recover under irradiation. This work provides us an in-depth explanation on the working mechanism of LOBs from a kinetic perspective, offering valuable insights for the future battery design.
广泛认为，锂氧电池（LOBs）的容量很大程度上取决于过氧化锂（LiO）放电产物的生长行为，该产物遵循表面和溶液共存的途径。然而，迄今为止，实现对LiO形态的动态调控仍然具有挑战性。在此，负载在还原氧化石墨烯上的光响应金纳米颗粒（Au/rGO）被用作阴极，借助表面等离子体共振（SPR）效应来操纵氧还原反应（ORR）动力学。因此，我们可以通过实验揭示ORR动力学与锂迁移对电池性能匹配的重要性。此外，发现锂浓度极化导致LOBs的“突然死亡”可能只是一种假死状态，在光照下可以及时恢复。这项工作从动力学角度为LOBs的工作机制提供了深入解释，为未来的电池设计提供了有价值的见解。
