Fu Yanqing, Shen Xiang, You Juan, Yu Ruizhi, Zheng Jinju, Wu Bing, Sofěr Zdenek, Wei Qiliang, Yang Weiyou
Laboratory of Infrared Material and Devices & Key Laboratory of Photoelectric Materials and Devices of Zhejiang Province, Advanced Technology Research Institute, Ningbo University, Ningbo, 315211, China.
Institute of Micro/Nano Materials and Devices, Ningbo University of Technology, Ningbo, Zhejiang, 315211, China.
Nano Lett. 2024 Sep 4;24(35):10759-10766. doi: 10.1021/acs.nanolett.4c01906. Epub 2024 Aug 21.
Currently, one major target for exploring K-ion batteries (KIBs) is enhancing their cycle stability due to the intrinsically sluggish kinetics of large-radius K ions. Herein, we report a rationally designed electrode, the S/O co-doped hard carbon spheres with highly ordered porous characteristics (SPC), for extremely durable KIBs. Experimental results and theory calculations confirm that this structure offers exceptional advantages for high-performance KIBs, facilitating rapid K diffusion and (de)-intercalation, efficient electrolyte penetration and transport, improved K storage sites, and enhanced redox reaction kinetics, thus ensuring the long-term cycle stability. As a result, the as-constructed SPC anode delivers a high reversible capacity of ca. 200 mAh g at a high current density of 2.0 A g and robust stability with ∼100% capacity retention up to 11,000 cycles, outperforming most carbon-based KIB anodes. This work offers insight into developing advanced KIBs with durable stability toward practical applications.
目前，由于大半径钾离子固有的缓慢动力学，探索钾离子电池（KIBs）的一个主要目标是提高其循环稳定性。在此，我们报道了一种合理设计的电极，即具有高度有序多孔特性的硫/氧共掺杂硬碳球（SPC），用于极其耐用的钾离子电池。实验结果和理论计算证实，这种结构为高性能钾离子电池提供了特殊优势，促进了钾的快速扩散和（脱）嵌入、电解质的有效渗透和传输、改善了钾存储位点并增强了氧化还原反应动力学，从而确保了长期循环稳定性。因此，所构建的SPC阳极在2.0 A g的高电流密度下具有约200 mAh g的高可逆容量和强大的稳定性，在高达11,000次循环中容量保持率约为100%，优于大多数基于碳的钾离子电池阳极。这项工作为开发具有持久稳定性的先进钾离子电池以实现实际应用提供了见解。
