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Vacuum‐Dried 3D Holey Graphene Frameworks Enabling High Mass Loading and Fast Charge Transfer for Advanced Batteries
Energy Technology ( IF 3.8 ) Pub Date : 2019-11-06 , DOI: 10.1002/ente.201901002
Junfei Liang 1, 2 , Yuqi Xu 1 , Hongtao Sun 3 , Xiang Xu 4 , Tengxiao Liu 3 , Hantao Liu 1 , Hua Wang 2
Affiliation  

Monolithic 3D graphene frameworks (GFs) electrode materials have exhibited the great potential for energy storage devices. However, most approaches for fabricating 3D GF require expensive and sophisticated drying techniques, and the current achieved 3D GF electrodes usually hold a relatively low mass loadings of the active materials with low areal capacity, which is not satisfactory for practical application. Herein, a convenient, economic, and scalable drying approach is developed to fabricate 3D holey GFs (HGFs) by a vacuum‐induced drying (VID) process for the first time. This binder‐free 3D HGF electrode with high mass loading can obtain extraordinary electrochemical performance for lithium‐ion batteries (LIBs) due to the 3D holey graphene network owning a highly interconnected hierarchical porous structure for fast charge and ion transport. The HGF electrode with high mass loading of 4 mg cm−2 exhibits superior rate performance and delivers an areal capacity as high as 5 mAh cm−2 under the current density of 8 mA cm−2 even after 2000 cycles, considerably outperforming those of state‐of‐the‐art commercial anodes and some representative anodes in other studies. This facile drying approach and robust realization of high areal capacity represent a critical step for 3D graphene‐based electrode materials toward practical electrochemical energy storage devices.

中文翻译:

真空干燥的3D多孔石墨烯框架可实现高级电池的高质量加载和快速电荷转移

整体式3D石墨烯骨架(GFs)电极材料在储能设备中显示出巨大的潜力。但是,大多数制造3D GF的方法都需要昂贵且复杂的干燥技术,并且当前获得的3D GF电极通常以较低的单位面积容量容纳相对较低的活性物质质量负载,这对于实际应用而言并不令人满意。本文首次开发了一种方便,经济且可扩展的干燥方法,以通过真空诱导干燥(VID)工艺制造3D多孔GF(HGF)。这种具有高质量负载的无粘结剂3D HGF电极可为锂离子电池(LIB)获得出色的电化学性能,这是因为3D多孔石墨烯网络拥有高度互连的分层多孔结构,可实现快速充电和离子传输。−2具有卓越的速率性能,即使在2000次循环后,在8 mA cm −2的电流密度下也可提供高达5 mAh cm −2的面容量,大大优于最新的商用阳极和一些代表性的阳极其他研究中的阳极。对于3D石墨烯基电极材料来说,这种简便的干燥方法和高面积容量的稳健实现是向实用的电化学能量存储设备迈出的关键一步。
更新日期:2019-11-06
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