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Air-stable naphthalene derivative-based electrolytes for sustainable aqueous flow batteries

Abstract

The growing global capacity for renewable energy generation necessitates the deployment of energy storage technologies with a combination of low cost, good performance and scalability. With these advantages, aqueous organic flow batteries have the potential to be the system of choice because they could store energy from organic redox-active molecules. Here we report naphthalene derivatives as organic redox-active molecules that exhibit high solubility (~1.5 M) and a stable redox-active framework with no obvious capacity decay over 40 days (50 Ah l−1) in an air atmosphere in flow batteries. We report a battery that runs smoothly even under continuous airflow without obvious capacity decay for ~22 days (more than 600 cycles). A series of spectral analyses and theoretical calculations reveal that the dimethylamine scaffolds improve the water solubility and protect the active centre, ensuring the stability of the molecules during the charge and discharge process. Owing to the success in kilogramme-scale molecular synthesis, pilot-scale stack expansion with notable cycling stability over 270 cycles (~27 days) is attained. The cost benefit evidenced by technoeconomic analysis together with the stability even under open-air conditions indicates the practical value of the present molecular system in grid-scale energy storage.

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Fig. 1: Chemical and electrochemical reaction and battery performance of naphthalene derivatives.
Fig. 2: In situ NMR of TANQ during electrochemical cycling.
Fig. 3: LC‒MS and EPR spectra of TANQ during operation.
Fig. 4: Stable radical intermediates and mechanism.
Fig. 5: Scaled-up TAND synthesis and pilot stacks.

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All data generated and/or analysed from this study are available from the corresponding authors upon reasonable request. Source data are provided with this paper.

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Acknowledgements

We acknowledge financial support from the National Key R&D Programme of China (grant no. 2022YFB2405000), the National Natural Science Foundation of China (grant nos 22279133 and 22393964), the International Partnership Programme of the Chinese Academy of Sciences (grant no. 121421KYSB20210028) and the CAS Strategic Leading Science & Technology Program (A) (grant no. XDA0400201). We thank X. Ai for his help with the in situ NMR measurement and discussions.

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Z.Z. and C.Z. conceived the idea and designed the experiments. C.Z., S.L. and X.L. supervised the project. Z.Z. conducted the experiments and data analysis. M.Z. and C.Z. helped with battery performance tests. T.L. contributed to the DFT simulation. Z.Z., T.L., C.Z. and X.L. organized and wrote the manuscript. All authors contributed to the discussion and revision of the manuscript.

Corresponding authors

Correspondence to Changkun Zhang, Shenghai Li or Xianfeng Li.

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Nature Sustainability thanks Qing Chen, Minjoon Park, Xiongwei Wu and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.

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Supplementary Figs. 1–6, 23–29 and 39 showing spectra analysis, Figs. 7–13, 15–22, 34–37 and 42–44 showing electrochemical or battery analysis, Figs. 14, 30 and 40 presenting digital images, Figs. 31–33 and 38 presenting the theoretical calculations, Fig. 41 showing the cost analysis, Tables 1 and 2 detailing electrochemical or battery properties/performance, Tables 3 and 4 giving cost analysis and Notes 1 and 2 presenting structural stability and battery performance.

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Zhao, Z., Li, T., Zhang, C. et al. Air-stable naphthalene derivative-based electrolytes for sustainable aqueous flow batteries. Nat Sustain 7, 1273–1282 (2024). https://doi.org/10.1038/s41893-024-01415-6

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