钾离子电池负极用掺硫碳:硫的掺杂和储钾机理的研究

IF 15.8 1区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
ACS Nano Pub Date : 2022-12-09 DOI:10.1021/acsnano.2c09845
Daping Qiu, Biao Zhang, Teng Zhang, Tong Shen, Zijing Zhao and Yanglong Hou*, 
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引用次数: 21

摘要

硫掺杂策略由于具有提高碳阳极容量和动力学的双重潜力而引起了钾离子电池碳阳极的广泛关注。了解硫的掺杂和储钾机理对于指导高性能硫掺杂碳阳极的结构设计和优化至关重要。本文提出了一种实验室合成的硫含量为6.4 at的硫掺杂硬碳(SHC)。以硫掺杂为例,阐明了硫掺杂机理,揭示了硫在钾储存中的作用。SHC的高含硫量源于硫对碳的选择性取代和硫分子碎片在硫化后的残留痕迹。因此,由于掺杂硫在钾储存中的多方面作用,在相同的测试条件下,SHC对无s硬碳的容量、速率能力和循环稳定性达到了两倍。此外,基于SHC阳极组装的钾离子混合电容器具有高能量/功率密度(139 Wh kg-1 /7.3 kW kg-1),以及非凡的循环稳定性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Sulfur-Doped Carbon for Potassium-Ion Battery Anode: Insight into the Doping and Potassium Storage Mechanism of Sulfur

Sulfur-Doped Carbon for Potassium-Ion Battery Anode: Insight into the Doping and Potassium Storage Mechanism of Sulfur

The sulfur doping strategy has been attracting extensive interest in potassium-ion battery carbon anodes for the dual potential of improving the capacity and kinetics of carbon anodes. Understanding the doping and potassium storage mechanism of sulfur is crucial to guide the structural design and optimization of high-performance sulfur-doped carbon anodes. Herein, presenting a laboratory-synthesized sulfur-doped hard carbon (SHC) with a sulfur content of 6.4 at. % as an example, we clarify the sulfur doping mechanism and reveal the role of sulfur in potassium storage. The high sulfur content of SHC stems from the selective substitution of sulfur for carbon and the residual trace of sulfur molecular fragments after sulfurization. As a result, thanks to the multifaceted roles of doped sulfur in potassium storage, about twice as much capacity, rate capability, and cycling stability is achieved for SHC against S-free hard carbon at the same test conditions. Furthermore, potassium-ion hybrid capacitors assembled based on an SHC anode demonstrate high energy/power density (139 Wh kg–1/7.3 kW kg–1), along with an extraordinary cycling stability.

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来源期刊
ACS Nano
ACS Nano 工程技术-材料科学:综合
CiteScore
26.00
自引率
4.10%
发文量
1627
审稿时长
1.7 months
期刊介绍: ACS Nano, published monthly, serves as an international forum for comprehensive articles on nanoscience and nanotechnology research at the intersections of chemistry, biology, materials science, physics, and engineering. The journal fosters communication among scientists in these communities, facilitating collaboration, new research opportunities, and advancements through discoveries. ACS Nano covers synthesis, assembly, characterization, theory, and simulation of nanostructures, nanobiotechnology, nanofabrication, methods and tools for nanoscience and nanotechnology, and self- and directed-assembly. Alongside original research articles, it offers thorough reviews, perspectives on cutting-edge research, and discussions envisioning the future of nanoscience and nanotechnology.
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