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Sulfur-Doped Carbon for Potassium-Ion Battery Anode: Insight into the Doping and Potassium Storage Mechanism of Sulfur
ACS Nano ( IF 15.8 ) Pub Date : 2022-12-09 , DOI: 10.1021/acsnano.2c09845 Daping Qiu 1 , Biao Zhang 1 , Teng Zhang 1 , Tong Shen 1 , Zijing Zhao 1 , Yanglong Hou 1
ACS Nano ( IF 15.8 ) Pub Date : 2022-12-09 , DOI: 10.1021/acsnano.2c09845 Daping Qiu 1 , Biao Zhang 1 , Teng Zhang 1 , Tong Shen 1 , Zijing Zhao 1 , Yanglong Hou 1
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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.
中文翻译：
用于钾离子电池阳极的硫掺杂碳：深入了解硫的掺杂和储钾机制
由于具有提高碳负极容量和动力学的双重潜力，硫掺杂策略引起了钾离子电池碳负极的广泛兴趣。了解硫的掺杂和储钾机制对于指导高性能硫掺杂碳负极的结构设计和优化至关重要。在此，介绍了一种实验室合成的硫含量为 6.4 at 的掺硫硬碳 (SHC)。% 为例，我们阐明了硫的掺杂机制并揭示了硫在钾存储中的作用。SHC的高硫含量源于硫对碳的选择性取代和硫化后残留的微量硫分子碎片。结果，由于掺杂硫在钾储存中的多方面作用，大约两倍的容量，在相同的测试条件下，SHC 相对于无 S 硬碳实现了倍率性能和循环稳定性。此外，基于 SHC 阳极组装的钾离子混合电容器表现出高能量/功率密度（139 Wh kg–1 /7.3 kW kg –1 )，以及非凡的循环稳定性。
更新日期：2022-12-09
中文翻译：
用于钾离子电池阳极的硫掺杂碳：深入了解硫的掺杂和储钾机制
由于具有提高碳负极容量和动力学的双重潜力，硫掺杂策略引起了钾离子电池碳负极的广泛兴趣。了解硫的掺杂和储钾机制对于指导高性能硫掺杂碳负极的结构设计和优化至关重要。在此，介绍了一种实验室合成的硫含量为 6.4 at 的掺硫硬碳 (SHC)。% 为例，我们阐明了硫的掺杂机制并揭示了硫在钾存储中的作用。SHC的高硫含量源于硫对碳的选择性取代和硫化后残留的微量硫分子碎片。结果，由于掺杂硫在钾储存中的多方面作用，大约两倍的容量，在相同的测试条件下，SHC 相对于无 S 硬碳实现了倍率性能和循环稳定性。此外，基于 SHC 阳极组装的钾离子混合电容器表现出高能量/功率密度（139 Wh kg–1 /7.3 kW kg –1 )，以及非凡的循环稳定性。
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