Synthesis of Nitrogen‐Doped Mesoporous Structures from Metal–Organic Frameworks and Their Utilization Enabling High Performances in Hybrid Sodium‐Ion Energy Storages,Advanced Science

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Synthesis of Nitrogen‐Doped Mesoporous Structures from Metal–Organic Frameworks and Their Utilization Enabling High Performances in Hybrid Sodium‐Ion Energy Storages
Advanced Science ( IF 14.3 ) Pub Date : 2020-01-27 , DOI: 10.1002/advs.201902986
Gyu Heon Lee ₁ , Jeung Ku Kang _{1,

2}

Affiliation

Sodium‐ion energy storage is of the most attractive candidate for commercialization adoption due to the safety and cost demands of large‐scale energy storage systems, but its low energy density, slow charging capability, and poor cycle stability are yet to be overcome. Here, a strategy is reported to realize high‐performance sodium‐ion energy storage using battery‐type anode and capacitor‐type cathode materials. First, nitrogen‐doped mesoporous titanium dioxide (NMTiO₂) structures are synthesized via the controlled pyrolysis of metal–organic frameworks. They exhibit interconnected open mesopores allowing fast ion transport and robust cycle stability with nearly 100% coulombic efficiency, along with rich redox‐reactive sites allowing high capacity even at a high rate of ≈90 C. Moreover, assembling the NMTiO₂ anode with the nitrogen‐doped graphene (NG) cathode in an asymmetric full cell shows a high energy density exceeding its counterpart symmetric cell by more than threefold as well as robust cycle stability over 10 000 cycles. Additionally, it gives a high‐power density close to 26 000 W kg⁻¹ outperforming that of a conventional sodium‐ion battery by several hundred fold, so that full cells can be charged within a few tens of seconds by the flexible photovoltaic charging and universal serial bus charging modules.

中文翻译：

由金属有机框架合成氮掺杂介孔结构及其在混合钠离子储能中实现高性能的利用

由于大规模储能系统的安全性和成本要求，钠离子储能是商业化应用中最有吸引力的候选者，但其能量密度低、充电能力慢和循环稳定性差的问题仍有待克服。本文报道了一种使用电池型阳极和电容器型阴极材料实现高性能钠离子储能的策略。首先，通过金属有机骨架的受控热解合成氮掺杂介孔二氧化钛（NMTiO ₂）结构。它们具有相互连接的开放介孔，可实现快速离子传输和强大的循环稳定性，库仑效率接近 100%，并且丰富的氧化还原反应位点即使在约 90 C 的高倍率下也能实现高容量。此外，将 NMTiO ₂阳极与氮组装在一起非对称全电池中的‐掺杂石墨烯（NG）阴极表现出比其对应的对称电池高三倍以上的高能量密度，以及超过 10 000 次循环的强大循环稳定性。此外，它的功率密度接近26 000 W kg ^{-1 ，}比传统钠离子电池高数百倍，因此可以通过灵活的光伏充电在几十秒内充满电池通用串行总线充电模块。

更新日期：2020-01-27

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