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Published on: November 9, 2019
Co(acac)2-Mediated Regulation of Li2O2 Gradient Growth in Lithium-Oxygen Batteries
Xingzi Zheng1,2, Peiyuan Su1, Jingshen Xu1
1Center for Advanced Materials Research and Faculty of Arts and Sciences, Instrumentation and Service Center for Science and Technology, Beijing Normal University, Zhuhai 519087, China.
Abstract:
In Li-O2 batteries, Li2O2 serves as the primary cathodic material but its wide band gap imparts insulating properties. Regulating the composition and morphology of Li2O2 enables the construction of a novel cathodic structure with exceptional electrochemical performance. Herein, we introduce an organic salt containing cobalt ions, cobalt acetylacetonate (Co(acac)2), into the cathodic electrolyte. We exploit its cation migration characteristics under an electric field to facilitate the generation and decomposition of Co-doped Li2O2, achieving gradient control and optimized growth of Li2O2. Moreover, the Co(acac)2 molecule stabilizes the properties of LiO species and mitigates side reaction. In situ UV-vis and XANES spectra reveal direct interactions between Co(acac)2 and O2-/LiO2, highlighting the superior reversibility of Co(acac)2 enhanced Li-O2 batteries. Both experimental and theoretical results indicate that this novel Li-O2 battery system exhibits rapid reaction kinetics, with a reduced overpotential of 520 mV and extended cyclability, surpassing 400 cycles with lower polarization.
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