In situ growth of δ-MnO2/C fibers as binder-free and free-standing cathode for advanced aqueous Zn-ions batteries

IF 6.1 1区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR

Inorganic Chemistry Frontiers Pub Date : 2024-09-26 DOI:10.1039/d4qi01661k

Yan Li, Fei Zhang, Miaomiao Wu, Yong Guo, Yuanyuan Liang, Reyihanguli Ababaikeri, Luyang Wang, Qiao Liu, Xingchao Wang

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Abstract

Manganese dioxide (MnO2) has been extensively studied in aqueous zinc ion batteries (AZIBs) due to its high redox potential, high theoretical capacity and low cost. However, its low capacity and poor structural stability result in poor performance. In this study, we propose a novel approach where δ-MnO2 is grown in situ on carbon fibers derived from coal (δ-MnO2@CCFs). The unform anchoring of δ-MnO2 on the carbon fibers allow for good flexibility and keep structural stability during cycling. The doping of heteroatoms (N) directly forms chemical bonds with δ-MnO2 and reduces electrostatic repulsion within the δ-MnO2@CCFs material, while facilitating the insertion and extraction of Zn2+ and H+ ions. Moreover, the flexible AZIBs exhibit excellent electrochemical reversibility even under bending and folding conditions. The δ-MnO2@CCFs electrode material exhibits a capacity of 352 mAh g-1 at a current density of 0.5 A g-1 after 100 cycles. Furthermore, the assembled flexible Zn//δ-MnO2@CCFs AZIBs maintain a capacity of 293.7 mAh g-1 after 50 cycles at a current density of 0.1 A g-1.

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将原位生长的 δ-MnO2/C 纤维作为无粘结剂和独立的阴极，用于先进的含水锌离子电池

二氧化锰（MnO2）具有高氧化还原电位、高理论容量和低成本的特点，因此在锌离子水电池（AZIBs）中得到了广泛的研究。然而，二氧化锰容量低、结构稳定性差，导致性能不佳。在本研究中，我们提出了一种新方法，即在煤（δ-MnO2@CCFs）衍生的碳纤维上原位生长 δ-MnO2。δ-MnO2在碳纤维上的非形式锚定使其具有良好的柔韧性，并在循环过程中保持结构稳定。杂原子（N）的掺杂直接与 δ-MnO2 形成化学键，减少了 δ-MnO2@CCFs 材料内部的静电排斥，同时有利于 Zn2+ 和 H+ 离子的插入和提取。此外，柔性 AZIB 即使在弯曲和折叠条件下也能表现出优异的电化学可逆性。经过 100 次循环后，δ-MnO2@CCFs 电极材料在 0.5 A g-1 的电流密度下显示出 352 mAh g-1 的容量。此外，组装好的柔性 Zn//δ-MnO2@CCFs AZIB 在 0.1 A g-1 的电流密度下，循环 50 次后仍能保持 293.7 mAh g-1 的容量。

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