An Air‐Operated, High‐Performance Fe‐Ion Secondary Battery Using Acidic Electrolyte,Advanced Materials

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An Air‐Operated, High‐Performance Fe‐Ion Secondary Battery Using Acidic Electrolyte
Advanced Materials ( IF 27.4 ) Pub Date : 2025-03-19 , DOI: 10.1002/adma.202502526
Zhaoyang Chen ₁ , Shuyang Bian ₁ , Wenshu Chen ₁ , Fei Ye ₂ , Chao Cheng ₁ , Shijia Shu ₁ , Qinfen Gu ₃ , Hongliang Dong ₄ , Pan Feng ₁ , Yuping Wu _{5,

6} , Linfeng Hu _{1,

6}

Affiliation

Fe2+ have emerged as the ideal charge carriers to construct aqueous batteries as one of the most competitive candidates for next‐generation low‐cost and safe energy storage. Unfortunately, the fast oxidation of Fe2+ into Fe3+ at ambient conditions inevitably requires the assembly process of the cells in an oxygen‐free glovebox. Up to date, direct air assembly of aqueous Fe‐ion battery remains very desirable yet highly challenge. Here oxidation of Fe2+ is found at ambient condition and is completely inhibited in an acidic electrolyte. A proton/O2 competitive mechanism in the acidic electrolyte is revealed with reduced coordinated O2 in the Fe2+ solvated shell for this unexpected finding. Based on this surprise, for the first time, air‐operated assembly of iron‐ion batteries is realized. Meanwhile, it is found that the acidic environment induces the in situ growth of active α‐FeOOH derivate on the VOPO4·2H2O surface. Strikingly, the acidic electrolyte enables an air‐operated Fe‐ion battery with a high specific capacity of 192 mAh g−1 and ultrastable cycling stability over 1300 cycles at 0.1 A g−1. This work makes a break through on the air‐assembly of Fe‐ion battery without oxygen‐free glovebox. It also reveals previously unknown proton/O2 competitive mechanisms in the Fe2+ solvated shell and cathode surface chemistry for aqueous Fe2+ storage.

中文翻译：

使用酸性电解质的气动高性能 Fe-Ion 二次电池

Fe2+ 已成为构建水系电池的理想电荷载流子，是下一代低成本和安全储能最具竞争力的候选者之一。不幸的是，在环境条件下，Fe2+ 快速氧化成 Fe3+ 不可避免地需要在无氧手套箱中进行电池组装过程。迄今为止，水性 Fe-ion 电池的直接空气组装仍然非常可取，但极具挑战性。在这里，Fe2+ 的氧化在环境条件下被发现，并在酸性电解质中被完全抑制。对于这一意外发现，揭示了酸性电解质中的质子/O 2 竞争机制，Fe2+ 溶剂化壳层中的配位 O 减少。基于这一惊喜，首次实现了铁离子电池的气动组装。同时，发现酸性环境诱导活性 α-FeOOH 衍生物在 VOPO4·2H2O 表面原位生长。引人注目的是，酸性电解质使气动 Fe-ion 电池具有 192 mAh g-1 的高比容量，并在 0.1 A g-1 下在 1300 次循环中具有超稳定的循环稳定性。这项工作突破了无氧手套箱的 Fe 离子电池的空气组装。它还揭示了 Fe2+ 溶剂化壳层和阴极表面化学中以前未知的质子/O2 竞争机制，用于 Fe2+ 水溶液存储。

更新日期：2025-03-19

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