Abstract
Lithium (Li) metal is promising for high energy density batteries due to its low electrochemical redox potential and high specific capacity. However, the formation of dendrites and its tendency for large volume expansion during plating/stripping restrict the application of Li metal in practical scenarios. In this work, we developed reduced graphene oxide-graphitic carbon nitride (rGO-C3N4, GCN) with highly elastic and wrinkled structure as the current collector. Lithiophilic site C3N4 in GCN could reduce the nucleation overpotential. In addition, this material effectively inhibited electrode expansion during cycling. At the same time, due to its high elasticity, GCN could release the stress induced by Li deposition to maintain structural integrity of the electrode. Li-metal anodes with GCN exhibited small volume expansion, high Coulombic efficiency (CE) of 98.6% within 300 cycles and long cycling life of more than 1700 h. This work described and demonstrated a new approach to construct flexible current collectors for stable lithium-metal anodes.
摘要
锂金属由于低电化学还原电位和高比容量, 被认为是最具发展前景的负极材料. 然而, 锂枝晶和体积膨胀等问题严重制约了锂金属电池的应用发展. 本研究中, 我们制备了高弹性波浪结构的 rGO-C3N4 (GCN)作为三维集流体. GCN的高弹性可有效释放锂沉 积过程产生的应力, 保持电极结构完整, 减小电极体积膨胀. C3N4 的亲锂性可降低锂的形核过电位, 促进锂离子均匀沉积. GCN作为三维集流体的锂金属负极, 经300个循环后, 仍具有较高的库仑效率, 低的体积膨胀率和更长的循环寿命. 高弹性波浪结构三维集流体改善了锂金属负极的电化学性能, 为构建柔性三维集流体提供了新思路.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (51525206 and 51927803), the National Key R&D Program of China (2016YFA0200100 and 2016YFB0100100), the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA22010602), Liaoning Revitalization Talents Program (XLYC1908015), and China Petrochemical Cooperation (218025). The authors thank Mrs. Juan Li and Mr. Bo Wen for their valuable discussion.
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Author contributions Lu W prepared and characterized the samples. Chen J performed mechanical tests. Lu W, Yang H, and Sun C analyzed experimental data and prepared the manuscript. Li F supervised the project and revised the manuscript. All authors contributed to the general discussion.
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Wenwen Lu is a master’s candidate at the Institute of Metal Research, Chinese Academy of Sciences (IMR, CAS). Her research interests include the syntheses and characterizations of 3D current collectors for lithium-metal anodes.
Feng Li is a professor of IMR, CAS. He received his PhD degree in materials science at IMR, CAS in 2001 supervised by Prof. Hui-Ming Cheng. He mainly works on the novel carbon-based and energy materials for lithium-ion batteries, lithium-sulfur batteries, electrochemical capacitors, and new devices. He obtained the award of the National Science Fund for Distinguished Young Scholars by the National Natural Science Foundation of China.
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Lu, W., Yang, H., Chen, J. et al. Highly elastic wrinkled structures for stable and low volume-expansion lithium-metal anodes. Sci. China Mater. 64, 2675–2682 (2021). https://doi.org/10.1007/s40843-021-1676-3
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DOI: https://doi.org/10.1007/s40843-021-1676-3