Aqueous rechargeable multiple metal-ion storage battery (ARSB) has a large potential in energy storage devices due to their safe usage, low cost and high rate capability. Nevertheless, the performance of practical ARSB is largely restricted by low capacity and limited cathode materials. Herein, we demonstrate an efficient cathode material based on CoNi-layered double hydroxide (LDH) nanosheets arrays with abundant hydrogen vacancy induced by electrochemical activation process for high performance of cations storage. Consequently, the electrochemical activated CoNi-LDH (ECA-CoNi-LDH) nanosheets arrays exhibit high metal ion (Li⁺, Na⁺, Zn²⁺, Mg²⁺ and Ca²⁺) storage capacities, which is 9 times and 3 times higher that of unactivated CoNi-LDH arrays and ECA-CoNi-LDH without hierarchical structure, respectively. Moreover, the ECA-CoFe-LDH also shows the possibility for practical applications in actual batteries. By coupling with a Fe₂O₃/C anode, the assembled aqueous battery delivered a large energy density of 184.4 Wh kg⁻¹ at power density of 4 Wh kg⁻¹ in high voltage range of 0 ∼ 2 V. To our best knowledge, such high energy density and large working window of our assembled aqueous battery is exceeded other LDH-based aqueous battery or supercapacitor, and the energy density almost comparable than that of commercial Li-ion batteries. Moreover, almost no measurable capacitance losses can be detected even after 10000 cycles. In addition, this work also provides a strategy to develop a high energy density cathode for multiple metal-ion storage batteries.

水系可充电多金属离子蓄电池（ARSB）具有使用安全、成本低、倍率高等优点，在储能装置中具有巨大的潜力。然而，实际 ARSB 的性能在很大程度上受到低容量和有限正极材料的限制。在此，我们展示了一种基于 CoNi 层状双氢氧化物 (LDH) 纳米片阵列的高效阴极材料，该阵列具有由电化学活化过程诱导的大量氢空位，用于高性能的阳离子存储。因此，电化学活化的CoNi-LDH（ECA-CoNi-LDH）纳米片阵列表现出高金属离子（Li ⁺、Na ⁺、Zn ²⁺、Mg ²⁺和Ca ²⁺) 存储容量，分别是未激活的 CoNi-LDH 阵列和没有分层结构的 ECA-CoNi-LDH 的 9 倍和 3 倍。此外，ECA-CoFe-LDH 还显示了在实际电池中实际应用的可能性。通过与 Fe ₂ O _{3 /C 阳极耦合，组装的水性电池在 4 Wh kg} ^-1的功率密度下提供了 184.4 Wh kg -1 的大能量^密度在 0 ∼ 2 V 的高压范围内。据我们所知，我们组装的水性电池具有如此高的能量密度和大的工作窗口，超过了其他基于 LDH 的水性电池或超级电容器，并且能量密度几乎可以与商用锂电池媲美离子电池。此外，即使经过 10000 次循环，也几乎无法检测到可测量的电容损失。此外，这项工作还为开发用于多金属离子蓄电池的高能量密度正极提供了一种策略。