ZnMn₂O₄ (ZMO) is a promising cathode material for aqueous zinc-ion batteries (ZIBs) due to its high capacity, high output voltage and rich abundance. However, the commercial application of ZMO is severely restricted by the rapid capacity decay at high rate resulting from low electrical conductivity and structural degradation. Herein, a commonplace one-step hydrothermal method is applied to rationally synthesize ZMO nanoparticles (∼20 nm) on carbon nanotubes (ZMO/CNTs) heterostructure for stable high-rate Zn²⁺ storage. The high electrical conductive CNTs and such small ZMO benefit from electrons’ fast transport, endowing ZMO/CNTs composite with high electrical conductivity. Furthermore, the flexible CNTs network and the strong interface interaction (Mn-O-C bond) between ZMO and CNTs can effectively suppress irreversible structural degradation. As a result, the ZMO/CNTs composite delivers a promising initial capacity of 220.3 mAh g⁻¹ at 100 mA g⁻¹ and a high capacity retention of 97.01% after 2000 cycles at 3000 mA g⁻¹, indicating excellent high-rate long-term cycling stability. Furthermore, the flexible ZIBs are assembled and show stable electrochemical properties at different bending states, demonstrating their potential practical applications.

ZnMn ₂ O ₄  (ZMO)具有高容量、高输出电压和丰富的丰度，是一种很有前途的水系锌离子电池(ZIBs)正极材料。然而，ZMO的商业应用受到低电导率和结构退化导致的高速容量快速衰减的严重限制。在此，应用一种常见的一步水热法在碳纳米管 (ZMO/CNTs) 异质结构上合理合成 ZMO 纳米粒子 (~20 nm) 以获得稳定的高倍率 Zn ²⁺贮存。高导电性 CNTs 和如此小的 ZMO 得益于电子的快速传输，赋予 ZMO/CNTs 复合材料高导电性。此外，柔性碳纳米管网络和ZMO与碳纳米管之间的强界面相互作用（Mn-OC键）可以有效抑制不可逆的结构退化。因此，ZMO/CNTs 复合材料在 100 mA g ^{-1下提供了 220.3 mAh g -1的有希望的初始容量，在 3000 mA g -1}下 2000 次循环后具有 97.01% 的高容量保持率，表明优异的长倍率长期循环稳定性。此外，柔性 ZIB 被组装并在不同弯曲状态下显示出稳定的电化学性能，展示了它们潜在的实际应用。