Traškina Nadežda, Gečė Gintarė, Pilipavičius Jurgis, Vilčiauskas Linas
Center for Physical Sciences and Technology (FTMC), Saulėtekio al. 3, Vilnius LT-10257, Lithuania.
Insitute of Chemistry, Vilnius University, Saulėtekio al. 3, Vilnius LT-10257, Lithuania.
ACS Appl Nano Mater. 2023 Jun 14;6(13):11780-11787. doi: 10.1021/acsanm.3c01687. eCollection 2023 Jul 14.
Due to their stability and structural freedom, NASICON-structured materials such as NaTi(PO) show a lot of promise as active electrode materials for aqueous batteries and deionization cells. However, due to their low intrinsic electronic conductivity, they must usually be composited with carbon to form suitable electrodes for power applications. In this work, two series of NaTi(PO)-carbon composite structures were successfully prepared by different approaches: postsynthetic pyrolytic treatment of citric acid and surface polymerized dopamine. The latter route allows for a superior carbon loading control and yields more uniform and continuous particle coatings. The homogeneity of the polydopamine derived core-shell carbon layer is supported by FTIR, TEM, and XPS analysis. Combustion elemental analysis also indicates significant nitrogen doping in the final carbonaceous structure. The galvanostatic charge and discharge cycling results show similar initial capacities and their retention, but at only half of the carbon loading in polydopamine derived samples. The overall results indicate that careful nanostructure engineering could yield materials with superior properties and stability suitable for various electrochemical applications such as aqueous Na-ion batteries and deionization cells.
由于其稳定性和结构自由度，诸如NaTi(PO)之类的NASICON结构材料作为水系电池和去离子电池的活性电极材料显示出很大的潜力。然而，由于其固有的电子电导率较低，它们通常必须与碳复合以形成适用于电力应用的电极。在这项工作中，通过不同方法成功制备了两个系列的NaTi(PO)-碳复合结构：柠檬酸的合成后热解处理和表面聚合多巴胺。后一种方法能够更好地控制碳负载量，并产生更均匀且连续的颗粒涂层。傅里叶变换红外光谱（FTIR）、透射电子显微镜（TEM）和X射线光电子能谱（XPS）分析证实了聚多巴胺衍生的核壳碳层的均匀性。燃烧元素分析还表明在最终的含碳结构中有显著的氮掺杂。恒电流充放电循环结果显示出相似的初始容量及其保持率，但聚多巴胺衍生样品中的碳负载量仅为一半。总体结果表明，精心的纳米结构工程可以产生具有优异性能和稳定性的材料，适用于各种电化学应用，如水系钠离子电池和去离子电池。
