Dense graphene papers: Toward stable and recoverable Al-ion battery cathodes with high volumetric and areal energy and power density
Dense graphene papers: Toward stable and recoverable Al-ion battery cathodes with high volumetric and areal energy and power density
复制标题
致密石墨烯纸：实现具有高体积和面积能量和功率密度的稳定且可恢复的铝离子电池阴极
DOI：
10.1016/j.ensm.2018.01.001
复制
发表时间：
2018-07-01
影响因子：
20.4
通讯作者：
Fang, Daining
中科院分区：
文献类型：
--
作者：
Wang, Peng;Chen, Haosen;Fang, Daining
由于铝离子电池（AIB）被认为是一种更安全、更高能量密度的新型储能原型，目前探索的碳阴极仍然面临挑战，特别是在以密集方式平衡快速离子传输通道和体积/面积储能能力方面。在这项贡献中，由导电石墨烯纳米片良好堆叠的特殊石墨烯纳米片（GN）纸已被证明是电化学稳定的主体，可用于快速AlCl4-离子传输/存储以及致密状态下的高体积/面积能量存储（1.6类似于1.8 g cm(-3)）。由于独特的形态和化学优势，具有无粘合剂GN纸阴极的组装后的AIB能够在50 mA g(-1)的电流密度下提供相当高的比容量100 mA h g(-1)（接近碳AIB阴极的理论值），并且与报道的碳AIB阴极相比，体积容量、面能量密度和功率密度大大提高。特别是，曲折度一词已被用来理解体积能量性能和微观结构之间的基本关系，这为开发先进的实用 AIB 提供了一个独特的平台。
Since Al ion batteries (AIBs) are known to be a novel energy storage prototype of more safe and higher energy density, challenges are still in the currently explored carbon cathodes, specifically in balancing the rapid ion transport channels and volumetric/areal energy storage capability at a dense fashion. In this contribution, exceptional graphene nanosheet (GN) papers that are well stacked by conductive graphene nanosheets have been demonstrated as an electrochemically stable host for fast AlCl4- ion transport/storage along with high volumetric/areal energy storage at a dense state (1.6 similar to 1.8 g cm(-3)). Owing to the exclusive morphological and chemical advantages, the as-assembled AIBs with the binder-free GN paper cathode enables to deliver considerably high specific capacity 100 mA h g(-1) at the current density 50 mA g(-1) (approaching the theoretic value of carbon AIB cathodes), coupled with much enhanced volumetric capacity, areal energy density and power density compared to the reported carbon AIB cathodes. Particularly, the term of tortuosity has been employed to understand the fundamental relationship between volumetric energy performance and microscopic structures, which suggests a unique platform for developing advanced practical AIBs.