Iqbal Sikandar, Wang Lu, Kong Zhen, Zhai Yanjun, Wang Fengbo, Jing Zhongxin, Sun Xiuping, Wang Bin, He Xiyu, Dou Jianmin, Xu Liqiang
Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, China.
Shandong Provincial Key Laboratory/Collaborative Innovation Center of Chemical Energy, Storage and Novel Cell Technology, Liaocheng University, Liaocheng, 252059, China.
Small. 2024 Nov;20(46):e2404193. doi: 10.1002/smll.202404193. Epub 2024 Aug 27.
2D transitional metal selenide heterostructures are promising electrode materials for potassium-ion batteries (PIBs) owing to the large surface area, high mechanical strength, and short diffusion pathways. However, the cycling performance remains a significant challenge, particularly concerning the electrochemical conversion reaction. Herein, 2D Se-rich ZnSe/CoSe@C heterostructured composite is fabricated via a convenient hydrothermal approach followed by selenization process, and then applied as high-performance anodes for PIBs. For example, the capacity delivered by the heterostructured composite is mainly contributed to the synergistic effect of conversion and alloy/de-alloy processes aroused by K, where K may highly insert or de-insert into Se-rich ZnSe/CoSe@C. The obtained electrode delivers an outstanding reversible charge capacity of 214 mA h g at 1 A g after 4000 cycles for PIBs, and achieves 262 mAh g when coupled with a PTCDA cathode in the full cell. The electrochemical conversion mechanism of the optimized electrode during cycling is investigated through in situ XRD, Raman, and ex situ HRTEM. In addition, the heterostructured composite as anodes also displays excellent electrochemical performances for sodium-ion batteries (SIBs) and lithium-ion batteries (LIBs). This work opens up a new window for investigating novel electrode materials with excellent capacity and long durability.
二维过渡金属硒化物异质结构因其大表面积、高机械强度和短扩散路径，有望成为钾离子电池（PIB）的电极材料。然而，循环性能仍然是一个重大挑战，尤其是在电化学转化反应方面。在此，通过简便的水热法随后进行硒化过程制备了二维富硒ZnSe/CoSe@C异质结构复合材料，然后将其用作PIB的高性能阳极。例如，异质结构复合材料提供的容量主要归因于钾引发的转化和合金化/脱合金化过程的协同效应，其中钾可能会大量插入或脱出富硒ZnSe/CoSe@C。所制备的电极在PIB中以1 A g的电流密度循环4000次后，具有214 mA h g的出色可逆充电容量，并且在全电池中与PTCDA阴极耦合时可达到262 mAh g。通过原位XRD、拉曼光谱和非原位高分辨率透射电子显微镜研究了优化电极在循环过程中的电化学转化机制。此外，作为阳极的异质结构复合材料对钠离子电池（SIB）和锂离子电池（LIB）也显示出优异的电化学性能。这项工作为研究具有优异容量和长耐久性的新型电极材料打开了一扇新窗口。
