Abstract
Lithium-ion hybrid capacitors (LIHCs) have drawn extensive attention in field of energy storage. However, the absence of appropriate electrode materials with rapid kinetics restricted the overall performance of the capacitors. Herein, hierarchical N, P-codoped hollow carbon nanospheres coupling with WS2 nanosheets (N, P-codoped HCNS/WS2 NSs) were fabricated for boosting lithium storage materials. Specially, the WS2 nanosheets with several layers embedded in the N, P-codoped hollow carbon nanospheres could not only enhance the conductivity of composites, but also provide abundant channels for the rapid transfer of ions. As a result, as-prepared N, P-codoped HCNS/WS2 NSs demonstrated superior rate performance and long-term cycling stability. The reversible discharge capacity of 725.2 mAh·g−1 could be preserved after 1000 cycles at a current density of 1.0 A·g−1. Furthermore, LIHCs devices were assembled by using N, P-codoped HCNS/WS2 NSs and activated carbon (AC) as the cathode and anode, which exhibited high energy density of 166.7 Wh·kg−1 and power density of 5312.4 W·kg−1. Last but not least, the capacity almost had no obvious deterioration after 6000 cycles at a high current density of 10.0 A·g−1.
Graphic abstract
摘要
混合锂离子电容器在储能领域引起了广泛关注。然而, 缺乏适合快速充放电的电极材料大大限制混合电容器的整体性能。本文通过设计合成钨基有机无机前驱体, 结合退火工艺制备得到磷氮掺杂碳空心球与WS2纳米片复合物, 并将其应用于高效锂离子储能。研究表明该复合结构表现出优异的倍率性能和循环稳定性, 在电流密度为1.0 A·g−1下循环1000圈, 放电比容量仍然保持为725.2 mAh·g−1。此外, 通过与活性炭匹配得到的锂离子电容器, 可以提供较高的能量密度(166.7 Wh·kg−1)和功率密度(5312.4 W·kg−1), 在10.0 A·g−1下经过6000个循环后容量几乎没有明显下降。
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (Nos. 51902266 and 22002003), the Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University (No. CX2021009), the Key Research and Development Projects of Shaanxi Province (No. 2020GXLH-Z-032), the Research Fund of the State Key Laboratory of Solidification Processing (NPU), China (No. G8QT0461G), and the Research Fund of the State Key Laboratory of Solidification Processing (NPU), China (No. SKLSP202004). We would like to thank the Analytical and Testing Center of Northwestern Polytechnical University for TEM characterizations.
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Zhao, ZJ., Chao, YG., Wang, F. et al. Intimately coupled WS2 nanosheets in hierarchical hollow carbon nanospheres as the high-performance anode material for lithium-ion storage. Rare Met. 41, 1245–1254 (2022). https://doi.org/10.1007/s12598-021-01850-w
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DOI: https://doi.org/10.1007/s12598-021-01850-w