通过气溶胶工艺轻松制备多孔 MoSe2/碳微球作为钾离子电池的负极材料

IF 4.6 4区 化学 Q2 ELECTROCHEMISTRY
D. Jo, Seung-Keun Park
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引用次数: 0

摘要

最近,钾离子电池(KIBs)引起了人们的极大兴趣,这是由于能源需求不断增长和锂资源有限等多种因素造成的。然而,由于 K+ 的尺寸较大,其循环稳定性较差,影响了其实际应用。因此,开发一种能有效抑制大体积变化的结构设计至关重要。本研究介绍了一种使用盐模板制造多孔微球(p-MoSe2@C MS)的简单方法,该微球由 MoSe2 和碳基质组成,可作为 KIB 的阳极材料。这些微球具有明显的多孔设计,均匀分布的 MoSe2 纳米晶体嵌入碳基质中,以防止 MoSe2 在热处理过程中因材料扩散而过度生长。制造工艺结合了一步喷雾干燥和可回收的氯化钠作为硬模板。通过惰性气氛下的两步热处理,最初的糊精、NaCl 和钼盐微球被转化为 p-MoSe2@N MS 复合材料。去掉 NaCl 后,糊精产生的碳结构保持了微球的形状,确保 MoSe2 不会过度生长。这种精心设计的多孔结构改善了与电解质的相互作用,促进了离子和电子的传输,并缩短了 K+ 的扩散距离。此外,多孔碳结构还能适应循环过程中的大体积变化,并保持其结构强度。因此,p-MoSe2@C MS 复合材料表现出卓越的电化学性能,具有显著的容量、长期循环稳定性(在 2.0 A g-1 条件下循环 500 次后为 193 mA h g-1)和速率能力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Facile Fabrication of Porous MoSe2/Carbon Microspheres via the Aerosol Process as Anode Materials in Potassium-Ion Batteries
Recently, potassium-ion batteries (KIBs) have attracted significant interest due to a number of factors, including the growing demand for energy and limited lithium resources. However, their practical use is hampered by poor cycling stability due to the large size of K+. Therefore, it is critical to develop a structural design that effectively suppresses large volume changes. This study presents a simple method of using a salt template to fabricate porous microspheres (p-MoSe2@C MS) of MoSe2 and a carbon matrix as anode materials in KIBs. These microspheres have a distinct porous design, with uniformly distributed MoSe2 nanocrystals embedded in the carbon matrix to prevent MoSe2 overgrowth due to material diffusion during heat treatment. The manufacturing process combined one-step spray drying with recyclable NaCl as a hard template. Through a two-step thermal process under an inert atmosphere, the initial dextrin, NaCl, and Mo salt microspheres were converted into a p-MoSe2@N MS composite. The carbon structure derived from the dextrin maintained the shape of the microspheres when NaCl was removed, ensuring no overgrowth of MoSe2. This well-designed porous structure improves the interaction with the electrolyte, facilitating the transport of ions and electrons and reducing the K+ diffusion distances. In addition, the porous carbon structure accommodates large volume changes during cycling and maintains its structural strength. As a result, p-MoSe2@C MS composite exhibits superior electrochemical properties, with remarkable capacity, long-term cycling stability (193 mA h g−1 after 500 cycles at 2.0 A g−1), and rate capability.
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来源期刊
Batteries
Batteries Energy-Energy Engineering and Power Technology
CiteScore
4.00
自引率
15.00%
发文量
217
审稿时长
7 weeks
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