Abstract
Anhydrous copper(II) fluoride (CuF2) has a high specific capacity of 528 mA h g−1 with an operating voltage of 3.55 V vs. Li/Li+, achieving a high gravimetric energy density of 1874 W h kg−1, which makes it a promising cathode candidate for next-generation rechargeable lithium (Li) batteries. However, the notorious dissolution of Cu during charging triggers the rapid failure of the CuF2 cathode, impeding its development. In this work, the reversibility of the anhydrous CuF2 electrode was enabled via the use of a fluorinated high-concentration (FHC) electrolyte to effectively suppress the dissolution of Cu. With the FHC electrolyte, the CuF2-Ketjen Black nanocomposite cathode delivered a reversible capacity of 228 mA h g−1 after 30 cycles, which nearly tripled that of the baseline electrolyte. Thus, the strategy of electrolyte engineering is proposed to harness CuF2 as a high-capacity cathode material for Li batteries.
摘要
无水氟化铜(CuF2)有望成为下一代锂电池正极材料, 其高比容量 (528 mA h g−1)和高工作电压(3.55 V vs. Li/Li+)使得其能量密度高达 1874 W h kg−1. 然而, 由于充电时铜的溶解, CuF2正极容易失活, 这限 制了其发展. 本研究采用氟化高浓电解液抑制铜的溶解, 从而实现了 CuF2正极的可逆循环. 采用氟化高浓电解液后, CuF2正极的容量在30 次循环后仍保有228 mA h g−1 是使用传统碳酸酯类电解液的电池容量 的近三倍. 综上, 本研究提出了一种电解质工程策略, 可以实现CuF2正 极的可逆充放电.
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Acknowledgements
This work was supported by the Fundamental Research Funds for the Central Universities and the Institute of Carbon Neutrality of Tongji University.
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Dai Y, Zhang R and Luo W conceived the idea. Huang Y, Liu X, and Wu W provided important experimental insights. Dai Y, Wang T and Song Z performed material fabrication and tests. Dai Y and Luo W co-wrote the paper. All the authors discussed the results and commented on the manuscript.
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The authors declare that they have no conflict of interest.
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Supporting data are available in the online version of the paper.
Yiming Dai received his BE degree from the East China University of Science and Technology in 2019. He is now a PhD candidate at the Institute of New Energy for Vehicles, School of Materials Science and Engineering, Tongji University. His research interest mainly focuses on conversion-type cathode materials for energy storage devices.
Renyuan Zhang received his PhD degree from Fudan University. He is currently a professor at the Institute of New Energy for Vehicles, School of Materials Science and Engineering, Tongji University. His research interest mainly focuses on energy storage materials, mesoporous materials, and nanomaterials.
Wei Luo is currently a professor at the School of Materials Science and Engineering, Tongji University. He received his PhD degree from Huazhong University of Science and Technology. Prior to his current position, he worked as a postdoctoral researcher at Oregon State University and the University of Maryland (UMD) until being promoted to assistant research professor at UMD. His research interests include solid-state batteries, liquid metals, and high-entropy materials.
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Enabling the reversibility of anhydrous copper(II) fluoride cathodes for rechargeable lithium batteries via fluorinated high-concentration electrolytes
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Dai, Y., Liu, X., Wu, W. et al. Enabling the reversibility of anhydrous copper(II) fluoride cathodes for rechargeable lithium batteries via fluorinated high-concentration electrolytes. Sci. China Mater. 66, 3039–3045 (2023). https://doi.org/10.1007/s40843-023-2468-5
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DOI: https://doi.org/10.1007/s40843-023-2468-5