Flexible energy storage devices based on graphene paper
Flexible energy storage devices based on graphene paper
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DOI：
10.1039/c0ee00640h
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发表时间：
2011-04-01
影响因子：
32.5
通讯作者：
Kang, Kisuk
中科院分区：
文献类型：
--
作者：
Gwon, Hyeokjo;Kim, Hyun-Suk;Kang, Kisuk
近来，对诸如卷起显示器和可穿戴设备的柔性/可弯曲电子设备已经引起了极大的兴趣。由于具有高能量和功率密度的柔性能量转换和能量存储单元是柔性电子产品不可或缺的组成部分，因此应仔细考虑。然而，制造柔性/可弯曲电源是一个巨大的挑战。这主要是由于缺乏可靠的材料，这些材料既联合收割机上级导电性又具有机械柔性，并且在电化学环境中也具有高稳定性。在这项工作中，我们报告了一种新的方法，灵活的能源设备。我们建议使用基于独立石墨烯纸的柔性电极，以应用于锂可充电电池。这是第一份报告，其中石墨烯纸被采用作为一个关键要素，应用于柔性锂可充电电池。此外，石墨烯纸是一种功能材料，其不仅充当导电剂，还充当集流体。石墨烯纸具有高机械强度、大表面积和上级导电性等优异性能，是一种很有前途的柔性储能设备基础材料。实质上，我们发现基于石墨烯的柔性电极在电化学性质方面表现出显著改善的性能，例如在能量密度和功率密度方面。此外，与非柔性的常规电极结构相比，石墨烯纸具有更好的生命周期。因此，我们相信我们的研究结果将有助于充分实现可弯曲电子设备中使用的柔性锂可充电电池。
Recently, great interest has been aroused in flexible/bendable electronic equipment such as rollup displays and wearable devices. As flexible energy conversion and energy storage units with high energy and power density represent indispensable components of flexible electronics, they should be carefully considered. However, it is a great challenge to fabricate flexible/bendable power sources. This is mainly due to the lack of reliable materials that combine both electronically superior conductivity and mechanical flexibility, which also possess high stability in electrochemical environments. In this work, we report a new approach to flexible energy devices. We suggest the use of a flexible electrode based on free-standing graphene paper, to be applied in lithium rechargeable batteries. This is the first report in which graphene paper is adopted as a key element applied in a flexible lithium rechargeable battery. Moreover graphene paper is a functional material, which does not only act as a conducting agent, but also as a current collector. The unique combination of its outstanding properties such as high mechanical strength, large surface area, and superior electrical conductivity make graphene paper, a promising base material for flexible energy storage devices. In essence, we discover that the graphene based flexible electrode exhibits significantly improved performances in electrochemical properties, such as in energy density and power density. Moreover graphene paper has better life cycle compared to non-flexible conventional electrode architecture. Accordingly, we believe that our findings will contribute to the full realization of flexible lithium rechargeable batteries used in bendable electronic equipments.