石墨烯
材料科学
重量分析
假电容
功率密度
储能
阴极
氧化物
超级电容器
电容器
纳米技术
化学工程
光电子学
电容
电极
功率(物理)
电气工程
电压
化学
冶金
物理
有机化学
物理化学
量子力学
工程类
作者
Lei Hu,Liwen Bo,Nengze Wang,Mengxuan Sun,Xiaohe Ren,Zhijie Li,Chunyang Jia
标识
DOI:10.1016/j.cej.2023.147570
摘要
For most consumer electronics, the volumetric performance of energy storage devices is usually more significant than traditional gravimetric performance. Zinc-ion capacitors (ZICs) are regarded as one of the most promising energy storage devices with high energy and power density. However, the low volumetric performance of the cathode is a serious problem that hinders its practical application. Herein, in this work, a compact freestanding graphene film was designed by tuning the interlayer structure of flame reduced graphene oxide sheets (FRGO) using graphene oxides (GO) via a self-assembly strategy. When the mass ratio of FRGO and GO is 75 %:25 %, the optimum of graphene film between density and electrochemical performance was achieved. The graphene film owns a bulk density of 0.82 g cm−3 and precisely regulated abundant mesoporous around 3.8 nm, which provides more active sites for ion storage. Profiting from the pseudocapacitance reaction between C = O and Zn2+, the compact graphene film with a thickness of 35 μm as ZICs cathode can deliver a high volumetric energy density of 113.1 Wh/L and outstanding gravimetric performance of 118.7 Wh kg−1 with a bulk density of 0.95 g cm−3, achieving the balance of the gravimetric and volumetric characteristics. The ZIC also presents a maximum volumetric power density of 21.2 kW/L at 7.9 Wh/L and 96.4 % capacity retention after 8000 cycles, revealing excellent compact energy storage and cyclability. Moreover, the soft-package ZIC devices present admirable scalability, further exposing the application potential of the compact graphene film in the ZIC field.
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