AgFeO₂ nanoparticles synthesized via precipitation at room temperature are investigated in Li- and Na-ion cells through electrode coatings with an alginate binder. The electrochemical reactions of AgFeO₂ with Li⁺ and Na⁺ ions, as well as its role as alternative negative electrode in these cell systems are carefully evaluated. Initial Li uptake causes irreversible amorphization of the AgFeO₂ structure with concomitant formation of Ag⁰ nanoparticles. Further Li incorporation results in conversion into Fe⁰ nanoparticles and Li₂O, together with Li-alloying of these Ag⁰ clusters. Similar mechanisms are also found upon Na uptake, although such processes are hindered by overpotentials, the capacity and reversibility of the reactions with Na⁺ ions being not comparable with those of their Li⁺ counterparts. The behaviour of AgFeO₂ at low potentials vs. Li⁺/Li displays a synergic pseudo-capacitive charge storage overlapping Li-Ag alloying/de-alloying. This feature is exploited in full cells having deeply lithiated AgFeO₂ and LiFePO₄ as negative and positive electrodes, respectively. These environmentally friendly iron-based full cells exhibit attractive cycle performances with ≈80% capacity retention after 1000 cycles without any electrolyte additive, average round trip efficiency of ≈89% and operational voltage of 3.0 V combined with built-in pseudo-capacitive characteristics that enable high cycling rates up to ≈25C.

通过使用藻酸盐粘合剂的电极涂层，在锂离子和钠离子电池中研究了在室温下通过沉淀合成的AgFeO ₂纳米颗粒。仔细评估了AgFeO ₂与Li ⁺和Na ⁺离子的电化学反应，以及其在这些电池系统中作为替代负极的作用。最初的Li吸收会导致AgFeO ₂结构不可逆地非晶化，并同时形成Ag ⁰纳米颗粒。进一步的Li掺入导致转化为Fe ⁰纳米颗粒和Li ₂ O，以及这些Ag ^0的锂合金化集群。钠的吸收也发现了类似的机理，尽管这种过程受过电势的阻碍，与Na ⁺离子反应的能力和可逆性与Li ⁺对应物的反应能力和可逆性不相上下。AgFeO ₂在低电势下（相对于Li ⁺ / Li的行为）显示出与Li-Ag合金化/脱合金重叠的协同伪电容电荷存储。在具有深锂化的AgFeO ₂和LiFePO _4的完整电池中利用了此功能分别作为负极和正极。这些环保的铁基全电池在无任何电解质添加剂的情况下，经过1000次循环后，仍具有有吸引力的循环性能，≈80％的容量保持率，平均往返效率≈89％，工作电压3.0 V，以及内置的伪电容特性实现高达≈25C的高循环速率。