Xiaomin Lin, Dr. Weicai Zhang, Jiaao Chen, Jiacong Lu, Prof. Mingtao Zheng, Prof. Yingliang Liu, Prof. Yeru Liang
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引用次数: 0
Abstract
Porous carbon materials are often difficult to achieve high density while possessing high porosity, which limits their application in compact energy storage. Here, a design of freestanding porous-yet-dense carbon films with a tunable density (1.08–1.33 g cm−3) and porosity (specific surface area of 0–423.8 m2 g−1) is presented through an assembly of porous carbon nanosheet with graphene oxide under vacuum filtration. The typical freestanding carbon films simultaneously deliver a high density of 1.08 g cm−3 and a high specific surface area of 423.8 m2 g−1 when the porous carbon nanosheet content is 75 wt.%. As anode materials for sodium-ion batteries, the optimized freestanding carbon films deliver high volumetric capacity (270 mAh cm−3 at 20 mA g−1), high initial capacity efficiency (81 %) and superior long-term cycling stability (1300 cycles with a capacity decay rate of 0.012 % per cycle). This study provides a promising direction for creating freestanding electrodes that meet both high-porosity and high-density requirements for compact sodium-ion batteries.
期刊介绍:
Electrochemical energy storage devices play a transformative role in our societies. They have allowed the emergence of portable electronics devices, have triggered the resurgence of electric transportation and constitute key components in smart power grids. Batteries & Supercaps publishes international high-impact experimental and theoretical research on the fundamentals and applications of electrochemical energy storage. We support the scientific community to advance energy efficiency and sustainability.