ZnFe₂O₄ has attracted much attention as an anode material for lithium-ion batteries (LIBs) because of its high theoretical capacity. However, the fast capacity fading and poor rate performance severely hamper its practical application. To overcome these problems, herein, ZnFe₂O₄ nanoparticles uniformly embedded in carbon matrix (ZnFe₂O₄/C composite) were fabricated by a facile chemical co-precipitation method and subsequent calcination process with leaching liquor of jarosite residue, NaCO₃, and ammonium citrate as raw materials. The prepared ZnFe₂O₄/C composite shows superior high-rate capability (with 731 mAh g⁻¹ at 0.5 A g⁻¹ and 321 mAh g⁻¹ at 10 A g⁻¹) and excellent cycling stability (with reversible capacity of 644 mAh g⁻¹ after 1000 cycles at 2 A g⁻¹). Cyclic voltammetry (CV) analysis reveals significant pseudocapacitive contributions during the discharge/charge processes of ZnFe₂O₄/C composite. This work provides a facile, efficient, and eco-friendly strategy for the preparation of high-performance transition metal oxides electrode materials for LIBs.

中文翻译：

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用黄钾铁矾残渣浸出液制备的ZnFe 2 O 4纳米颗粒嵌入碳中，作为锂离子电池的负极材料

ZnFe ₂ O ₄由于其高理论容量而作为锂离子电池（LIBs）的负极材料备受关注。然而，快速的容量衰减和差的速率性能严重地阻碍了其实际应用。为了克服这些问题，在此，通过一种简便的化学共沉淀方法，然后用黄钾铁矾残留物NaCO ₃浸出液进行煅烧工艺，制备出均匀嵌入碳基体（ZnFe ₂ O ₄ / C复合材料）中的ZnFe ₂ O ₄纳米颗粒。以柠檬酸铵为原料。制备的ZnFe ₂ O ₄/ C复合材料显示出优异的高倍率性能（具有731毫安克^-1在0.5 A克^-1和321毫安克^-1以10 A G ^-1）和优异的循环稳定性（具有644毫安克可逆容量^-1后在2 A g ^-1时进行1000次循环。循环伏安法（CV）分析显示ZnFe ₂ O ₄ / C复合材料的放电/充电过程中存在明显的拟电容作用。这项工作为制备用于LIB的高性能过渡金属氧化物电极材料提供了一种简便，高效且环保的策略。