Murashko Kirill, Karhunen Tommi, Meščeriakovas Arūnas, Subedi Nabin, Lähde Anna, Jokiniemi Jorma
Department of Environmental and Biological Sciences, University of Eastern Finland, PO Box 1627, Yliopistonranta 1, FI-70211, Kuopio, Finland.
Nanotechnology. 2024 Feb 2;35(16). doi: 10.1088/1361-6528/ad1942.
This study presents an oxalic acid-assisted method for synthesizing spinel-structured lithium titanate (LiTiO; LTO)/carbon composite materials. The Ag-doped LTO nanoparticles (NPs) are synthesized via flame spray pyrolysis (FSP). The synthesized material is used as a precursor for synthesizing the LTO-NP/C composite material with chitosan as a carbon source and oxalic acid as an additive. Oxalic acid improves the dissolution of chitosan in water as well as changes the composition and physical and chemical properties of the synthesized LTO-NP/C composite material. The oxalic acid/chitosan ratio can be optimized to improve the electrochemical performance of the LTO-NP/C composite material, and the electrode synthesized with a high mass loading ratio (5.44 mg cm) exhibits specific discharge capacities of 156.5 and 136 mAh gat 0.05 C- and 10 C-rate currents, respectively. Moreover, the synthesized composite LTO-NP/C composite material exhibits good cycling stability, and only 1.7% decrease in its specific capacity was observed after 200 charging-discharging cycles at 10 C-rate discharging current.
本研究提出了一种草酸辅助合成尖晶石结构钛酸锂（LiTiO；LTO）/碳复合材料的方法。通过火焰喷雾热解（FSP）合成了Ag掺杂的LTO纳米颗粒（NPs）。以合成的材料为前驱体，以壳聚糖为碳源、草酸为添加剂合成LTO-NP/C复合材料。草酸改善了壳聚糖在水中的溶解性，同时改变了合成的LTO-NP/C复合材料的组成以及物理和化学性质。可以优化草酸/壳聚糖的比例以改善LTO-NP/C复合材料的电化学性能，以高质量负载率（5.44 mg cm）合成的电极在0.05 C-和10 C-倍率电流下的比放电容量分别为156.5和136 mAh g。此外，合成的复合LTO-NP/C复合材料表现出良好的循环稳定性，在10 C-倍率放电电流下进行200次充放电循环后，其比容量仅下降了1.7%。
