期刊
ELECTROCHIMICA ACTA
卷 257, 期 -, 页码 372-379出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2017.10.056
关键词
Scale-up; Graphene pouch cell; Activated carbon; Supercapacitor; High-power
资金
- Engineering and Physical Sciences Research Council (UK) [EP/K016954/1]
- Engineering and Physical Sciences Research Council [EP/J021229/1, EP/K016954/1] Funding Source: researchfish
- EPSRC [EP/J021229/1, EP/K016954/1] Funding Source: UKRI
A scale-up process of high-rate-capability supercapacitors based on electrochemically exfoliated graphene (EEG) and hybrid activated carbon (AC)/EEG are studied in this work. A comparison of the rate capabilities of large-scale EEG and AC/EEG-based pouch cell and commercial high-power supercapacitors are also presented in this paper. The oxygen content of the EEG used in this work is 9.6 at%, with a C/O ratio of 9.36, and the electrical conductivity is 2.68 x 10(4) Sm-1. The specific capacitance (59 Fg(-1)) of the EEG-based supercapacitors remained above 80% of the maximum value as the scan rate was increased from 5 mVs(-1) to 1 Vs(-1). Furthermore, our study reveals how the rate capability of activated carbon (AC) based supercapacitors can be improved by adding EEG into the electrodes to form a hybrid AC/EEG supercapacitor. Both the EEG-based and AC/EEG supercapacitors were scaled-up to pouch cells with capacitances of tens of farads. The electrochemical response was unchanged when scaling up from a coin cell to a pouch cell, although the specific capacitance fell slightly. The cycle performance of the AC/EEG pouch cell showed good long-term stability, with better than 95% capacitance retention after 10,000 cycles. Both the EEG and AC/EEG (with 1:1 mass ratio) pouch cells had rate capabilities that compared favourably with the commercial high-power supercapacitors. Crown Copyright (C) 2017 Published by Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据