摘要
A cost-effective carbon-free nanocoating strategy was developed for the synthesis of ultra-fine SnO2 coatingα-Fe2O3 core-shell nanoparticles. This strategy only involves a two-step molten salt reaction at low temperature of 300 °C. The as-preparedα-Fe2O3@SnO2 core-shell nanocomposites show enhanced electrochemical performances than the bareα-Fe2O3 nanoparticles. This involved metal oxide nanocoating method is easy to be carried out, and the heat treatment temperature is much lower than that of other traditional solid-state annealing method and many carbon or metal oxide nanocoating methods. The molten salt method may also be used to produce other metal oxides coating nanostructures as the electrode materials for lithium-ion batteries.
采用一种经济有效的非碳纳米包覆技术制备超细SnO_2颗粒包覆α-Fe_2O_3核壳形式的纳米结构材料。这种技术仅涉及两步低温(300℃)熔盐反应。相对于纯的α-Fe_2O_3纳米颗粒,所制备的α-Fe_2O_3@SnO_2纳米核壳颗粒显示出更好的电化学性能。金属氧化物纳米包覆的方法比较容易实施,其热处理温度远低于传统的固相烧结反应和其他碳或金属氧化物纳米包覆方法的热处理温度。这种新的熔盐反应包覆技术也可用于制备其他氧化物纳米包覆结构,并可将这些纳米复合结构材料用于锂离子电池电极材料。
基金
Projects(51202297,81372464,51472271)supported by the National Natural Science Foundation of China
Project(NCET-12-0554)supported by the New Century Excellent Talents in University
Project(2013CB932901)supported by the National Basic Research Program of China
