Transition metal oxides ion diffusion channels have been developed for ammonium-ion batteries (AIBs). However, the influence of microstructural features of diffusion channels on the storage and diffusion behavior of NH 4 + is not fully unveiled. In this study, by using MnCo 2 O 4 spinel as a model electrode, the asymmetric ion diffusion channels of MnCo 2 O 4 have been regulated through bond length optimization strategy and investigate the effect of channel size on the diffusion process of NH 4 + . In addition, the reducing channel size significantly decreases NH 4 + adsorption energy, thereby accelerating hydrogen bond formation/fracture kinetics and NH 4 + reversible diffusion within 3D asymmetric channels. The optimized MnCo 2 O 4 with oxygen vacancies/carbon nanotubes composite exhibits impressive specific capacity (219.2 mAh g –1 at 0.1 A g –1 ) and long-cycle stability. The full cell with 3,4,9,10-perylenetetracarboxylic diimide anode demonstrates a remarkable energy density of 52.3 Wh kg –1 and maintains 91.9% capacity after 500 cycles. This finding provides a unique approach for the development of cathode materials in AIBs.

中文翻译：

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用于铵离子电池的MnCo 2 O 4 尖晶石的高效不对称扩散通道


过渡金属氧化物离子扩散通道已被开发用于铵离子电池（AIB）。然而，扩散通道的微观结构特征对NH 4+ 的存储和扩散行为的影响尚未完全揭示。本研究以MnCo 2 O 4 尖晶石为模型电极，通过键长优化策略调控MnCo 2 O 4 的不对称离子扩散通道，并研究通道尺寸对NH 4+ 扩散过程的影响。此外，减小的通道尺寸显着降低了NH 4+ 吸附能，从而加速了3D不对称通道内的氢键形成/断裂动力学和NH 4+ 可逆扩散。具有氧空位/碳纳米管复合材料的优化MnCo 2 O 4 表现出令人印象深刻的比容量（0.1 A g –1 时为219.2 mAh g –1 ）和长循环稳定性。采用 3,4,9,10-苝四甲二酰亚胺阳极的全电池表现出 52.3 Wh kg –1 的卓越能量密度，并在 500 次循环后保持 91.9% 的容量。这一发现为 AIB 中正极材料的开发提供了一种独特的方法。