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Sulfur-assisted large-scale synthesis of graphene microspheres for superior potassium-ion batteries
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2020-12-17 , DOI: 10.1039/d0ee03203d
Qingfeng Zhang 1, 2, 3, 4, 5 , Xueli Cheng 6, 7, 8, 9 , Chengxin Wang 5, 10, 11, 12 , Apparao M. Rao 13, 14, 15, 16, 17 , Bingan Lu 1, 2, 3, 4, 5
Affiliation  

Large-scale low-cost preparation methods for high quality graphene are critical for advancing graphene-based applications in energy storage, and beyond. Here, we present a sulfur-assisted method that converts benzene rings of tetraphenyltin into high purity crystalline graphene. Specifically, three dimensional few layer graphene microspheres (FLGMs) were prepared which proved ideal for energy storage applications. For a potassium ion battery, the FLGM-based anodes exhibited a low discharge platform (average discharge platform about 0.1 V), a high initial capacity of 285 mA h g−1 at 50 mA g−1, and a high rate performance (252 mA h g−1 at 100 mA g−1 and 95 mA h g−1 at 1000 mA g−1). Additionally, the FLGM-based anodes exhibited excellent cycling stability with no capacity loss after 1000 cycles at 200 mA g−1. A process of this nature which does not require substrates, and is scalable for continuous or semi-continuous production of graphene, paves the way for graphene-based energy storage devices.

中文翻译:

硫辅助大规模合成高级钾离子电池用石墨烯微球

高质量石墨烯的大规模低成本制备方法对于推进储能及其他领域中基于石墨烯的应用至关重要。在这里,我们提出了一种硫辅助方法,该方法将四苯基锡的苯环转化为高纯度的结晶石墨烯。具体而言,制备了三维几层石墨烯微球(FLGM),事实证明,该微球非常适合储能应用。对于钾离子电池,基于FLGM的阳极表现出低放电平台(平均放电平台约为0.1 V),在50 mA g -1下具有285 mA hg -1的高初始容量以及高倍率性能(252 mA) hg -1在100 mA g -1和95 mA hg -1在1000 mA g -1)。另外,基于FLGM的阳极表现出优异的循环稳定性,在200mA g -1下1000次循环后没有容量损失。这种性质的方法不需要基底,并且可扩展用于石墨烯的连续或半连续生产,为基于石墨烯的储能装置铺平了道路。
更新日期:2021-01-13
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