Abstract Core-shelled NiFe2O4/NiO@Fe2O3 nanocubes were synthesized based on Prussian blue analogues. The core-shelled structure was built through ion-exchange process in aqueous solution, and was remained after calcination. Different concentrations of ferrous affect the size and surface states of PBA precursors and its successor. Fabricated core-shelled NiFe2O4/NiO@Fe2O3 nanocubes produced with the PBA precursor that soaked in the solution of ferrous ion with the highest concentration in this work appears the most stable capacity during cycles, because of its more homogeneous Fe2O3 layer surface and more complete crystal. At the current density of 100 mA/g, it offers an initial capacity of 1587.96 mA h/g, and the second capacity of 967.91 mA h/g, that was remained as 806.1 mA h/g after 50 cyles. At 500 mA/g, it performs a capacity of 472.5 mA h/g after 500 cycles with a strong stability.

中文翻译：

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基于普鲁士蓝类似物的锂离子电池NiFe2O4/NiO@Fe2O3核壳纳米立方体的简单制备方法

摘要 基于普鲁士蓝类似物合成了核壳NiFe2O4/NiO@Fe2O3纳米立方体。核壳结构在水溶液中通过离子交换过程构建，并在煅烧后保留。不同浓度的亚铁会影响 PBA 前体及其后继体的尺寸和表面状态。在这项工作中浸泡在最高浓度亚铁离子溶液中的 PBA 前驱体制备的核壳 NiFe2O4/NiO@Fe2O3 纳米立方体在循环过程中表现出最稳定的容量，因为其 Fe2O3 层表面更均匀，晶体更完整. 在100 mA/g的电流密度下，初始容量为1587.96 mA h/g，二次容量为967.91 mA h/g，50个循环后仍为806.1 mA h/g。在 500 mA/g 时，它的容量为 472。