Abstract

In this work, we fabricated NiFe₂O₄/C composite with a coral-like structure through co-precipitation approach followed by thermal decomposition. The composite with a large surface area of 162.1 m² g⁻¹ and an average pore size of 11.8 nm was obtained. The porous structure in the composite derived from oxalate can effectively accommodate the volume changes of NiFe₂O₄ during the cycling processes. When used as anode materials, the initial charge and discharge capacities of the composite were 926.7 and 1277.7 mAh g⁻¹ at 100 mA g⁻¹. After 50 cycles, the reversible capacity of NiFe₂O₄/C could still remain at 892.4 mAh g⁻¹. Even at a current density of 2000 mA g⁻¹, the reversible capacity still reached 523.3 mAh g⁻¹. The results showed that the synergy between NiFe₂O₄ and carbon improved the electrochemical performance, and the porous composite could stabilize the structure of the electrode.

Graphic Abstract

中文翻译：

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类似于珊瑚的NiFe 2 O 4 / C复合材料作为锂离子电池的高性能负极材料

摘要

在这项工作中，我们通过共沉淀法然后热分解制备了具有珊瑚状结构的NiFe ₂ O ₄ / C复合材料。获得具有162.1m ²  g ^-1的大表面积和11.8nm的平均孔径的复合物。草酸盐衍生的复合材料中的多孔结构可以有效地适应循环过程中NiFe ₂ O ₄的体积变化。当作为阳极材料使用的，复合材料的初始充放电容量分别为926.7和1277.7毫安克^-1在100mA克^-1。50次循环后，NiFe ₂ O ₄的可逆容量/ C仍可保持在892.4 mAh g ^-1。即使在2000 mA g ^-1的电流密度下，可逆容量仍达到523.3 mAh g ^-1。结果表明，NiFe ₂ O ₄与碳的协同作用提高了电化学性能，并且多孔复合材料可以稳定电极的结构。

图形摘要