Abstract
Lithium-ion capacitors (LICs), consisting of a battery-like negative electrode and a capacitive porous-carbon positive electrode, deliver more than twice the energy density of electric double-layer capacitors. However, their wide application suffers from low energy density and reduced cycle life at high rates. Herein, hierarchical meso—microporous carbon nanospheres with a highly disordered structure and nitrogen/phosphorous co-doped properties were synthesized through a facile template method. Such hierarchical porous structure facilitates rapid ion transport, and the highly disordered structure and high heteroatom content provide abundant active sites for Li+ charge storage. Electrochemical experiments demonstrated that the carbon nanosphere anode delivers large reversible capability, greatly improves rate capability and exhibits excellent cycle stability. An LIC fabricated with the carbon nanosphere anode and an activated carbon cathode yields a high energy density of 103 W h kg−1, an extremely high power density of 44,630 W kg−1, and long-term cyclability of over 10,000 cycles. This work presents how structural control of carbon materials at the nano/atomic scale can significantly enhance electrochemical performance, enabling new opportunities for the design of high-performance energy-storage devices.
摘要
锂离子电容器通常由一个电池型负极和一个电容型多孔炭正极组成, 可输出比传统双电层电容器高两倍的能量密度, 但是在高倍率条件下其能量密度低、循环寿命短, 因而其广泛应用受到阻碍. 本文通过模板法合成了一种结构高度无序、氮/磷共掺杂的分级介孔炭纳米球.这种分级多孔结构有利于锂离子的快速迁移, 且高度无序的结构和高杂原子含量为锂离子电荷存储提供了丰富的活性位点. 电化学测试表明, 该炭纳米球负极具有较高比容量(在0.1 A g−1时, 为1108.6 mA h g−1), 优异的倍率性能(在8 A g−1时, 为276.5 mA h g−1), 以及良好的循环稳定性(1000次循环后仍保持85%的容量). 以该分级多孔纳米球为负极, 自制活性炭为正极所组装的锂离子电容器具有较高的能量密度(103 W h kg−1)、功率密度(44,630 W kg−1)以及长循环寿命(>10,000圈). 该工作揭示了如何通过在纳米/原子尺度上调控炭材料微结构来提高电化学性能的方法, 为设计高性能的储能设备提供了新策略.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (51902188, 21603125, and 52171182), the Natural Science Foundation of Jiangsu Province (BK20190207), the CAS Key Laboratory of Carbon Materials (KLCMKFJJ2006), and the Key Research and Development Program of Shandong Province (2021ZLGX01). The authors are grateful for the computational support from the National Supercomputer Centre (NSC), the HPC Cloud Platform of Shandong University, and the Young Scholars Program of Shangdong University.
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Li T, Wang R, Zhang J, Qian Z, and Yin L designed and engineered the samples; Li T, Zhang J, Li C, and Zhao H performed the experiments; Li T and Zhang J wrote the paper with the support from Wang R, Zhang J, Qian Z, and Yin L. All authors contributed to the general discussion.
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Tong Li received her BSc degree from the School of Materials Science and Engineering, Shandong University of Science and Technology, in 2019. She is currently pursuing her MSc degree at the School of Materials Science and Engineering, Shandong University. Her current research focuses on the field of carbon materials and their applications in supercapacitors.
Jianjun Zhang received his BSc degree from the School of Materials Science and Engineering, Shandong University of Science and Technology, in 2015. He is currently pursuing his MSc degree at the School of Materials Science and Engineering, Shandong University. His current research focuses on the field of DFT calculations and light metal materials.
Jing Zhang is an associate researcher at the Advanced Materials Institute, Qilu University of Technology (Shandong Academy of Sciences). She received her PhD degree in materials science from Lanzhou University of Technology (2010). Currently, her research focuses on novel porous carbon materials for supercapacitors and gas adsorbents.
Zhao Qian is a professor at the School of Materials Science and Engineering, Shandong University. He received his PhD degree in materials physics from KTH Royal Institute of Technology, Sweden (2013). From 2015 to 2018, he worked as a postdoctoral fellow at Uppsala University, Sweden. Currently, his research focuses on DFT calculations and light metal materials.
Rutao Wang is a professor at the School of Materials Science and Engineering, Shandong University. He received his PhD degree in materials science from Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences (2015). From 2013 to 2014, he joined Professor Li Zhang’s group as a research fellow at the Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong. Currently, his research focuses on advanced materials for supercapacitors and all-solidstate batteries.
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Nitrogen and phosphorous co-doped hierarchical meso—microporous carbon nanospheres with extraordinary lithium storage for high-performance lithium-ion capacitors
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Li, T., Zhang, J., Li, C. et al. Nitrogen and phosphorous co-doped hierarchical meso—microporous carbon nanospheres with extraordinary lithium storage for high-performance lithium-ion capacitors. Sci. China Mater. 65, 2363–2372 (2022). https://doi.org/10.1007/s40843-021-2047-x
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DOI: https://doi.org/10.1007/s40843-021-2047-x