Phosphorus‐Functionalized Graphene for Lithium‐Ion Capacitors with Improved Power and Cyclability,Batteries & Supercaps

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Phosphorus‐Functionalized Graphene for Lithium‐Ion Capacitors with Improved Power and Cyclability
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-11-30 , DOI: 10.1002/batt.202000247
Gelines Moreno‐Fernández ₁ , Miguel Granados‐Moreno ₁ , Juan Luis Gómez‐Urbano _{1,

2} , Daniel Carriazo _{1,

3}

Affiliation

Herein, we report an easy approach for the preparation of graphene‐based materials suitable as electrodes for lithium‐ion capacitors (LICs). To the best of our knowledge, this is the first time that phosphorus‐functionalized graphene oxide (rGO800‐P) is used as negative (battery‐type) electrode in LICs technology. An activated carbon derived from the pyrolysis of graphene‐carbon composite served as positive (capacitor‐type) electrode. While phosphorus functionalization on the negative electrode enables fast Li⁺ kinetics during insertion/extraction processes, the flat‐shaped morphology, large surface area and proper pore size distribution of the positive electrode enhance the double‐layer formation. Full LICs optimization, oversizing the negative electrode allows operating in the extended voltage window of 1.5–4.5 V delivering high energy and power values (91 Wh kg⁻¹_AM at 145 W kg⁻¹_AM and 33 Wh kg⁻¹_AM at 26,000 W kg⁻¹_AM) without compromising the cycling performance (76 % capacitance retention after 10,000 cycles).

中文翻译：

磷功能化石墨烯，可改善功率和循环性能，可用于锂离子电容器

在此，我们报告了一种简便的方法来制备适合用作锂离子电容器（LICs）电极的石墨烯基材料。据我们所知，这是磷功能化氧化石墨烯（rGO800-P）首次在LICs技术中用作负（电池型）电极。石墨烯-碳复合材料热解得到的活性炭用作正（电容器型）电极。负极上的磷官能化可实现快速的Li ⁺插入/拔出过程中的动力学，扁平形的形态，大表面积和正电极的适当孔径分布可增强双层形成。满低收入国家优化，尺寸过大的负电极允许1.5-4.5 V的扩展的电压窗口操作提供高的能量和功率值（91瓦时千克^-1_AM在145公斤w ^ ^-1_AM和33瓦时千克^-1_AM在26000W¯¯ kg ^-1_AM），而不会影响循环性能（10,000次循环后的电容保持率为76％）。

更新日期：2020-11-30

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