Reinforced bonding of Mo-doped MnO_2 with ammonium-ion as cathodes for durable aqueous MnO_2–Zn batteries
Reinforced bonding of Mo-doped MnO_2 with ammonium-ion as cathodes for durable aqueous MnO_2–Zn batteries
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DOI：
10.1007/s40843-023-2448-0
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发表时间：
2023-05
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通讯作者：
Junjie Zheng;Pei-ji Shi;Chi Chen;Xin Chen;Yisheng Gan;Jing-ying Li;Jia Yao;Yin Yang;Lin Lv;Guokun Ma;Li Tao;Hanbin Wang;Jun Zhang;Liangping Shen;Houzhao Wan;H. Wang
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作者：
Junjie Zheng;Pei-ji Shi;Chi Chen;Xin Chen;Yisheng Gan;Jing-ying Li;Jia Yao;Yin Yang;Lin Lv;Guokun Ma;Li Tao;Hanbin Wang;Jun Zhang;Liangping Shen;Houzhao Wan;H. Wang
水性可充电锌/锰电池以其低成本、高能量密度等优点引起了人们的广泛研究兴趣。然而，慢反应动力学、MnO2阴极的歧化以及不可逆的相变机制在很大程度上制约了它的发展。在这里，我们选择了Mo掺杂的α-MnO_2(Mo-MnO_2)作为正极材料，并提出了一种稳定的N-H-⋯O键增强的相互作用，通过插入NH4+来稳定Mo-MnO_2的2×2隧道结构。对该阴极的性能进行了理论和实验研究。有效地抑制了Mn3+的溶解，在质子插入/去除过程中没有发生晶格扭曲，进一步提高了阴极的循环稳定性。在100 mA g−1的电流密度下，Mo-MnO2正极材料的比容量为265.2 mA h g−1，能量密度为364.3 W h kg−1，表现出良好的循环稳定性。当电流密度为2.0A g−1时，1000次循环后的比容量为95.2%。这项工作为进一步深入了解电极主要材料中非金属阳离子之间的键合作用提供了依据，为构建具有高能量密度和长期循环能力的水基锌离子电池做出了贡献。
Aqueous rechargeable Zn//MnO2batteries have attracted extensive research interest owing to their low cost and high energy density. However, the slow reaction kinetics, the disproportionation of the MnO2cathode, and the irreversible phase transition mechanism considerably restrict their development. Here, we chose Mo-doped α-MnO2(Mo–MnO2) as the cathode material and proposed a stable N–H⋯O bond-reinforced interaction formedviaNH4+intercalation to stabilize the 2 × 2 tunnel structure of Mo–MnO2. Theoretical and experimental studies were conducted to demonstrate the performance of the cathode. Mn3+dissolution was effectively inhibited, and lattice distortion did not occur during the proton insertion/removal process, which further improved the cyclic stability of the cathode. Specifically, at a current density of 100 mA g−1, the Mo–MnO2cathode exhibited a specific capacity of 265.2 mA h g−1, the energy density was 364.3 W h kg−1, and the cathode exhibited excellent cyclic stability. At a current density of 2.0 A g−1, the specific capacity was 95.2% after 1000 cycles. This work provides further insight into the bond interaction between nonmetallic cations in the main materials of electrodes and contributes to the construction of aqueous-based zinc-ion batteries with high energy density and long-term cycling capability.