噻吩- s掺杂辅助构建钠离子电池高性能沥青基硬碳阳极

Dong Sun , Lu Zhao , Yin Yang , Changbo Lu , Chunming Xu , Zhihua Xiao , Xinlong Ma
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引用次数: 0

摘要

硬碳因其优异的化学稳定性和丰富的资源而成为一种很有前途的钠离子电池负极材料。然而,由于Na+反应动力学缓慢,其快速充电性能较差,限制了其在储能领域的应用。本文通过简单的球磨和碳化工艺制备了具有优异快速充电性能的噻吩- s掺杂氧化沥青(SOP-600)。优化后的SOP-600样品具有丰富的活性位点和丰富的微介孔结构,具有快速离子传输通道,显著增强了Na+反应动力学,提高了快速充电性能。当用作sib阳极时,op -600在0.05 A g−1时提供了令人印象深刻的690.3 mAh g−1比容量。此外,在7 a g−1时,它保持了373.5 mAh g−1的显著可逆容量,容量保持率为54.1%,表现出优异的快速充电性能。此外,op -600阳极在1 a g−1下的循环容量为490.7 mAh g−1,循环1000次后容量保持率为92.5%,突出了其强大的结构稳定性。此外,由op -600阳极和活性炭阴极组装的钠离子混合电容器(sic)在1a g - 1下可获得53.5 mAh g - 1的高可逆容量。这项工作为噻吩- s掺杂如何增强sib中硬碳的快速充电性能提供了理论见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Thiophene-S doping assisted constructing high-performance pitch-based hard carbon anode for sodium-ion batteries
Hard carbon has emerged as a promising anode material for sodium-ion batteries (SIBs) due to its exceptional chemical stability and abundant resources. However, its application in energy storage is limited by the poor fast-charging performance caused by the slow Na+ reaction kinetics. Herein, thiophene-S doped oxidized pitch (SOP-600) with outstanding fast-charging performance has been fabricated via a facile ball milling and carbonization procedure. Benefiting from the high thiophene-S doping content, the optimized SOP samples (SOP-600) exhibit plentiful active sites and a rich micro-mesoporous structure with rapid ion transport channels, significantly enhancing the Na+ reaction kinetics and improving the fast-charging performance. When employed as SIBs anode, SOP-600 delivers an impressive specific capacity of 690.3 mAh g1 at 0.05 A g−1. In addition, it maintains a significant reversible capacity of 373.5 mAh g−1 at 7 A g−1 with a capacity retention rate of 54.1%, demonstrating excellent fast-charging performance. Moreover, SOP-600 anode exhibits a remarkable cycling capacity of 490.7 mAh g−1 under 1 A g−1, with 92.5% capacity retention after 1000 cycles, highlighting its robust structural stability. Furthermore, sodium ion hybrid capacitors (SICs) assembled with SOP-600 anode and activated carbon cathode achieve a high reversible capacity of 53.5 mAh g−1 at 1 A g−1. This work provides theoretical insights into how thiophene-S doping enhances the fast-charging performance of hard carbon in SIBs.
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材料导报:能源(英文)
材料导报:能源(英文) Renewable Energy, Sustainability and the Environment, Nanotechnology
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