Liu Chang, Yuan Long-Ji, Zhang Yue, Liu Bo, Ding Fang-Wei, Li Yi-Xing, Dai Yun-Kun, Liu Jian, Sui Xu-Lei, Wang Zhen-Bo
College of Physics and Optoelectronic Engineering, Shenzhen Key Laboratory of Special Functional Materials, Shenzhen Engineering Laboratory for Advance Technology of Ceramics, Guangdong Research Center for Interfacial Engineering of Functional Materials, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China.
School of Engineering, Faculty of Applied Science, The University of British Columbia, Kelowna V1V 1V7, BC, Canada.
J Colloid Interface Sci. 2024 Jan;653(Pt A):756-763. doi: 10.1016/j.jcis.2023.09.100. Epub 2023 Sep 16.
Transition metal chalcogenides (TMCs) have demonstrated great potential in energy storage devices due to their versatile structures and composite functionalities. However, the application of TMCs in potassium-ion batteries (PIBs) suffers from the issues of large volume expansion, polysulfide dissolution, and sluggish kinetics. To overcome these challenges, this work develops nano-flower-like MnS-CoS confined in poly-pyrrole (PPY) carbon nanotube (denoted as MS-CS-PPY) as an excellent anode in PIBs. The nitrogen-doped PPY framework facilitates the interface electron transfer, confines active materials MS-CS effectively, and mitigates the volume change, thus resulting in boosted reaction kinetics and exceptional cycling stability. TMCs induce the surface capacitance and enable the chemical anchoring of the charge/discharge products during the potassium/de-potassium process. Moreover, this work reveals the potassium/de-potassium reaction mechanism, redox kinetics, and solid electrolyte interphase formation of MS-CS-PPY in different electrolytes through theoretical calculations and experimental studies. The solvation ability of electrolytes plays a vital role in manipulating the redox kinetics of the MS-CS-PPY anode material. This study offers feasible strategies for electrode design and electrolyte selection for developing TMCs negative electrodes in future PIBs.
过渡金属硫族化合物（TMCs）因其多样的结构和复合功能，在储能设备中展现出巨大潜力。然而，TMCs在钾离子电池（PIBs）中的应用面临着体积膨胀大、多硫化物溶解以及动力学迟缓等问题。为克服这些挑战，本研究制备了一种限域于聚吡咯（PPY）碳纳米管中的纳米花状MnS-CoS（记为MS-CS-PPY），作为PIBs中性能优异的负极材料。氮掺杂的PPY骨架促进了界面电子转移，有效限域了活性材料MS-CS，并减轻了体积变化，从而加快了反应动力学，提高了循环稳定性。TMCs诱导表面电容，并在钾离子嵌入/脱出过程中实现对充放电产物的化学锚定。此外，本研究通过理论计算和实验研究，揭示了MS-CS-PPY在不同电解质中的钾离子嵌入/脱出反应机理、氧化还原动力学以及固体电解质界面的形成过程。电解质的溶剂化能力在调控MS-CS-PPY负极材料的氧化还原动力学方面起着至关重要的作用。本研究为未来PIBs中TMCs负极材料的电极设计和电解质选择提供了可行的策略。
