Flexible holey graphene paper electrodes with enhanced rate capability for energy storage applications.
Flexible holey graphene paper electrodes with enhanced rate capability for energy storage applications.
复制标题
DOI：
10.1021/nn202710s
复制
发表时间：
2011-10
期刊：
影响因子：
17.1
通讯作者：
Xin Zhao;C. Hayner;M. Kung;H. Kung
中科院分区：
文献类型：
--
作者：
Xin Zhao;C. Hayner;M. Kung;H. Kung
高比表面积、高导电性和坚固的机械完整性的独特组合引起了人们对石墨烯薄膜在未来电子应用中的极大兴趣。然而，它们在高功率储能设备中的潜在应用受到可访问体积的限制，可访问体积可能只是物理体积的一小部分，这是由于堆栈的紧凑几何结构和离子迁移率的结果。在这里，我们证明了用于锂离子电池的石墨烯纸可以通过机械空化-化学氧化方法控制面内孔隙率的产生来实现显著增强的功率输送。这些柔性的、有孔的石墨烯纸，通过简单的微观工程创造，具有丰富的离子结合部位，增强的离子扩散动力学，以及出色的高速锂离子存储能力，适合于高性能的能量存储设备。
The unique combination of high surface area, high electrical conductivity and robust mechanical integrity has attracted great interest in the use of graphene sheets for future electronics applications. Their potential applications for high-power energy storage devices, however, are restricted by the accessible volume, which may be only a fraction of the physical volume, a consequence of the compact geometry of the stack and the ion mobility. Here we demonstrated that remarkably enhanced power delivery can be realized in graphene papers for the use in Li-ion batteries by controlled generation of in-plane porosity via a mechanical cavitation-chemical oxidation approach. These flexible, holey graphene papers, created via facile microscopic engineering, possess abundant ion binding sites, enhanced ion diffusion kinetics, and excellent high-rate lithium-ion storage capabilities, and are suitable for high-performance energy storage devices.