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首页> 外文期刊>Advanced energy materials >Defect-Rich Soft Carbon Porous Nanosheets for Fast and High-Capacity Sodium-Ion Storage
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Defect-Rich Soft Carbon Porous Nanosheets for Fast and High-Capacity Sodium-Ion Storage

机译：富缺陷的软碳多孔纳米片，用于快速和高容量的钠离子存储

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摘要

Soft carbon has attracted tremendous attention as an anode in rocking-chair batteries owing to its exceptional properties including low-cost, tunable interlayer distance, and favorable electronic conductivity. However, it fails to exhibit decent performance for sodium-ion storage owing to difficulties in the formation of sodium intercalation compounds. Here, microporous soft carbon nanosheets are developed via a microwave induced exfoliation strategy from a conventional soft carbon compound obtained by pyrolysis of 3,4,9,10-perylene tetracarboxylic dianhydride. The micropores and defects at the edges synergistically leads to enhanced kinetics and extra sodium-ion storage sites, which contribute to the capacity increase from 134 to 232 mAh g(-1) and a superior rate capability of 103 mAh g(-1) at 1000 mA g(-1) for sodium-ion storage. In addition, the capacitance-dominated sodium-ion storage mechanism is identified through the kinetics analysis. The in situ X-ray diffraction analyses are used to reveal that sodium ions intercalate into graphitic layers for the first time. Furthermore, the as-prepared nanosheets can also function as an outstanding anode for potassium-ion storage (reversible capacity of 291 mAh g(-1)) and dual-ion full cell (cell-level capacity of 61 mAh g(-1) and average working voltage of 4.2 V). These properties represent the potential of soft carbon for achieving high-energy, high-rate, and low-cost energy storage systems.
机译：由于软碳具有低成本，可调节的层间距离和良好的电子传导性等优异性能，因此作为摇椅电池中的阳极已引起了极大的关注。但是，由于钠嵌入化合物的形成困难，因此不能表现出良好的钠离子存储性能。在此，通过微波诱导的剥落策略，从通过3,4,9,10-per四羧酸二酐的热解获得的常规软碳化合物中开发出微孔软碳纳米片。边缘处的微孔和缺陷协同导致动力学增强和额外的钠离子存储位，这有助于将容量从134 mAh g（-1）增加到232 mAh g（-1），并在103 mAh g（-1）时具有出色的速率能力1000 mA g（-1）用于钠离子存储。此外，通过动力学分析确定了电容主导的钠离子存储机制。原位X射线衍射分析用于揭示钠离子首次嵌入石墨层。此外，所制备的纳米片还可以用作钾离子存储（可逆容量为291 mAh g（-1））和双离子全电池（电池级容量为61 mAh g（-1））的出色阳极。平均工作电压为4.2 V）。这些特性代表了软碳在实现高能量，高速率和低成本储能系统方面的潜力。

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