Abstract
Lithium-sulfur (Li-S) batteries have attracted extensive attention along with the urgent increasing demand for energy storage owing to the high theoretical specific capacity and energy density, abundant reserves and low cost of sulfur. However, the practical application of Li-S batteries is still impeded due to the low utilization of sulfur and serious shuttle-effect of lithium polysulfides (LiPSs). Here, we fabricated the porous honeycomb-like C3N4 (PHCN) through a hard template method. As a polar material, graphitic C3N4 has abundant nitrogen content (∼58%), which can provide enough active sites to mitigate shuttle-effect, and then conductive reduced graphene oxide (rGO) was introduced to combine with PHCN to form PHCN/rGO composite in order to improve the utilization efficiency of sulfur. After sulfur loading, the PHCN/rGO/S cathode exhibited an initial discharge capacity of 1,061.1 mA h g−1 at 0.2 C and outstanding rate performance at high current density of 5 C (495.1 mA h g−1), and also retained 519 mA h g−1 after 400 cycles at 1 C. Even at high sulfur loading (4.3 mg cm−2), the capacity fade rate was only 0.16% per cycle at 0.5 C for 200 cycles. The above results de monstrate that the special design of PHCN/rGO composite as sulfur host has high potential application for Li-S rechargeable batteries.
摘要
锂硫(Li-S)二次电池因其具有较高的理论比容量和能量密度, 以及硫资源丰富, 成本低廉等优点而备受关注. 然而, 由于硫的利用率低以及多硫化物(LiPSs)的穿梭效应严重, 锂硫二次电池的实际应用仍然受到限制. 本论文通过硬模板法合成了多孔蜂窝状 C3N4 (PHCN), 合成的C3N4经载硫后, 所得正极PHCN/rGO/S在0.2 C的电流密度下有较高的初始放电比容量(1061.1 mA h g−1)和良好的倍率性能( 如在大电流密度5 C下, 其放电比容量为 495.1 mA h g−1); 在1 C的电流密度下循环400圈, 其容量仍保持在519 mA h g−1; 即使在高面载量(4.3 mg cm−2)、 0.5 C的电流密度下循环200圈, 其每圈的容量衰减率仅0.16%. 上述结果表明, 多孔蜂窝状C3N4/rGO是一种有发展潜力的锂硫电池正极载体材料.
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Acknowledgements
This work was supported by the Chinese Academy of Sciences Large Apparatus United Fund (U1832187), the National Nature Science Foundation of China (21471091), the Natural Science Foundation of Shandong Province (ZR2019MEM030), Guangdong Province Science and Technology Plan Project for Public Welfare Fund and Ability Construction Project (2017A010104003), the Fundamental Research Funds of Shandong University (2018JC022), and Taishan Scholar Project of Shandong Province (ts201511004).
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Xiaomeng Bai got her Bachelor degree from Kunming University of Science and Technology. Now, she is a master student under the supervision of Prof. Liqiang Xu at the School of Chemistry and Chemical Engineering, Shandong University, China. Her research interests mainly focus on the design and preparation of host materials for lithium-sulfur batteries.
Liqiang Xu received his BSc degree in chemistry from Liaocheng University in 2000. In 2005, he received his PhD degree in inorganic chemistry from the University of Science and Technology of China. Then he worked at Shandong University, and from May 2012 to May 2013, he worked as a Research Fellow in Nanyang Technology University in Singapore. He is currently a professor at the School of Chemistry and Chemical Engineering, Shandong University, China. His research interests focus on energy related inorganic functional materials.
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Bai, X., Wang, C., Dong, C. et al. Porous honeycomb-like C3N4/rGO composite as host for high performance Li-S batteries. Sci. China Mater. 62, 1265–1274 (2019). https://doi.org/10.1007/s40843-019-9430-0
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DOI: https://doi.org/10.1007/s40843-019-9430-0