Co(acac)<sub>2</sub>-Mediated Regulation of Li<sub>2</sub>O<sub>2</sub> Gradient Growth in Lithium–Oxygen Batteries
In Li-O<sub>2</sub> batteries, Li<sub>2</sub>O<sub>2</sub> serves as the primary cathodic material but its wide band gap imparts insulating properties. Regulating the composition and morphology of Li<sub>2</sub>O<sub>2</sub> 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)<sub>2</sub>), into the cathodic electrolyte. We exploit its cation migration characteristics under an electric field to facilitate the generation and decomposition of Co-doped Li<sub>2</sub>O<sub>2</sub>, achieving gradient control and optimized growth of Li<sub>2</sub>O<sub>2</sub>. Moreover, the Co(acac)<sub>2</sub> molecule stabilizes the properties of LiO<sub><i>x</i></sub> species and mitigates side reaction. In situ UV-vis and XANES spectra reveal direct interactions between Co(acac)<sub>2</sub> and O<sub>2</sub><sup>-</sup>/LiO<sub>2</sub>, highlighting the superior reversibility of Co(acac)<sub>2</sub> enhanced Li-O<sub>2</sub> batteries. Both experimental and theoretical results indicate that this novel Li-O<sub>2</sub> battery system exhibits rapid reaction kinetics, with a reduced overpotential of 520 mV and extended cyclability, surpassing 400 cycles with lower polarization.
Authors
- Jianing Yue (ORCID: https://orcid.org/0000-0003-0668-5867)
- Jihao Zhang (ORCID: https://orcid.org/0000-0001-6192-4862)
- Siao Li (ORCID: https://orcid.org/0000-0003-1830-0602)
- Feifei Su
- Jiachang Huang
- Jingshen Xu
- Qiangqiang Zhong (ORCID: https://orcid.org/0000-0002-5855-0270)
- Wenli Su
- Mengwei Yuan (ORCID: https://orcid.org/0000-0003-0060-1108)
- Haomin Jiang (ORCID: https://orcid.org/0000-0002-4990-2393)
- Peiyuan Su
- Qingyu Kong (ORCID: https://orcid.org/0000-0002-3274-179X)
- Xingzi Zheng (ORCID: https://orcid.org/0009-0006-8065-6019)
- Wei Xiong (ORCID: https://orcid.org/0000-0003-0192-0506)
- Xingyu Chen (ORCID: https://orcid.org/0000-0002-3986-5744)
- Wenkai Zhang (ORCID: https://orcid.org/0000-0002-9574-6272)
Institutions
- Beijing Normal University (CN)
- Synchrotron soleil (FR)
- Guangdong Special Equipment Inspection and Research Institute (CN)
- Ministry of Natural Resources (RW)
- Shandong Special Equipment Inspection Institute (CN)
Publication Details
- Journal
- Nano Letters
- Published
- 2025-04-28
- DOI
- https://doi.org/10.1021/acs.nanolett.5c00023
- Citations
- 5
- Primary Topic
- Advancements in Battery Materials
- Type
- article
- Field-Weighted Citation Impact
- 3.65
Funders
- National Natural Science Foundation of China
- Basic and Applied Basic Research Foundation of Guangdong Province