Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
11005936 | Journal of Power Sources | 2018 | 10 Pages |
Abstract
Lithium-ion hybrid supercapacitor emerges as a promising candidate to bridge the performance gap between lithium ion batteries and supercapacitors. However, for current lithium-ion hybrid supercapacitor systems, high energy storage is usually accompanied with the sacrifice of high power density due to the mismatched kinetics between the sluggish lithium intercalation in anode and the rapid ion adsorption/desorption at cathode. In this work, we design a simple and controllable synthesis of holey carbon nanolayers with targeted porosity as both anode and cathode to achieve rapid electrochemical kinetics in lithium-ion hybrid supercapacitors. The mesoporous structure, enlarged interlayer spacing and excellent electrical conductivity of anode ensure greatly mitigated lithium diffusion. Simultaneously, the hierarchical porous texture and large external active surface area of cathode contribute to an outstanding capacity of 140 mAh gâ1 and better rate capability. The lithium-ion hybrid supercapacitor based on holey carbon nanolayers shows a high energy density up to 181â¯Wh kgâ1, and still preserves a remarkable energy density of 114â¯Wh kgâ1 even at an ultra-high power density of 65â¯kWâ¯kgâ1. This work illustrates the pertinence of porosity and morphology manipulation as a competitive strategy for rational fabrication of lithium-ion hybrid supercapacitor electrodes with high power density.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Chen Li, Xiong Zhang, Kai Wang, Xianzhong Sun, Yanwei Ma,