Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7725118 | Journal of Power Sources | 2018 | 7 Pages |
Abstract
The full realization of the high energy density concept in current hybrid capacitors is still a challenge due to the huge difference in specific capacity and reaction kinetics of the commonly used cathode and anode materials. Herein, for the first time, the carbon-sulfur composite is proposed as the high-capacity cathode for hybrid capacitors to achieve a high energy density. The as-prepared carbon-sulfur composite delivers a high specific capacity of 212.2â¯mAh gâ1 (424.4â¯Fâ¯gâ1) at 4â¯Aâ¯gâ1, which is much higher than that of the pure carbon cathode. Additionally, the kinetics gap between cathode and anode is narrowed by using carbon-sulfur composite as the cathode. As a result, the carbon-sulfur composite based hybrid capacitor delivers a high energy density of 258.4â¯Wh kgâ1â¯at 995â¯Wâ¯kgâ1. Even at high power density of 17350â¯Wâ¯kgâ1, the energy density can still remain 125.3â¯Wh kgâ1. This study provides an alternative approach for designing hybrid capacitors with both high energy and power density by using carbon-sulfur composite as the cathode, and also paves a way to extend the application of sulfur to a new field for taking its advantages of high-capacity, environmental friendliness, low-cost.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Bin He, An-Hui Lu, Fei Cheng, Xiao-Fei Yu, Dong Yan, Wen-Cui Li,