The dissolution of Mn-based oxides cathodes is an urgent issue, as it leads to electrochemically irreversible byproducts and, finally, battery failure. In this work, activated NiMn-LDHv nanosheets with H vacancies are proposed as the cathode material for durable zinc ion batteries. The H vacancies promote Mn2+ deposition by redistributing the electron density and building strong Mn-O bonds, as a result, endowing NiMn-LDHv with the ability of controllable back-deposition of Mn2+. It's verified that MnO2 is deposited on the NiMn-LHDv substrate during charging, the dissolution and the Zn2+/H+ co-intercalation of MnO2 have a combined contribution to the discharge capacity. The full battery with NiMn-LDHv cathode delivers rate capacity of 258 mAh g−1 at 0.3 A g−1, and even 90 mAh g−1 at 11.0 A g−1. Furthermore, the irreversible Mn-based byproducts are inhibited, resulting in durable cycling performance. After 2500 charge/discharge cycles, the initial capacity remains 91 %. This work provides an important strategy to utilize Mn2+ efficiently and develop a robust Mn-based cathode, which could greatly prompt the practical application of aqueous zinc ion batteries.

中文翻译：

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NiMn-LDH 纳米片的 H 空位诱导的高效 Mn2+ 沉积，用于耐用的锌离子电池


锰基氧化物阴极的溶解是一个紧迫的问题，因为它会导致电化学不可逆的副产物，并最终导致电池故障。在这项工作中，提出了具有 H 空位的活性 NiMn-LDHv 纳米片作为耐用锌离子电池的正极材料。H 空位通过重新分配电子密度和建立强 Mn-O 键来促进 Mn2+ 沉积，从而赋予 NiMn-LDHv 可控的 Mn2+ 背沉积能力。验证了 MnO2 在充电过程中沉积在 NiMn-LHDv 衬底上，MnO2 的溶解和 Zn2+/H+ 共嵌入对放电容量有共同贡献。带有 NiMn-LDHv 阴极的满电池在 0.3 A g-1 时可提供 258 mAh g-1 的倍率容量，在 11.0 A g-1 时甚至提供 90 mAh g-1 的倍率容量。此外，不可逆的 Mon 基副产物受到抑制，从而获得持久的循环性能。经过 2500 次充放电循环后，初始容量仍为 91%。这项工作为有效利用 Mn2+ 并开发坚固的 Mn 基阴极提供了一种重要的策略，这可以极大地促进水性锌离子电池的实际应用。