Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8961298 | International Journal of Hydrogen Energy | 2018 | 8 Pages |
Abstract
These years, LiO2 batteries attract wide interest because of its high theoretical energy density. However, the catalytic activity and porous structure of cathode remains a great challenge. In this work, we developed a hierarchical porous graphene foam to serve as a battery cathode, which has much richer active sites for cathodic reaction and channels for Li+ transfer and O2 diffusion. The cathode exhibits a superior specific capacity as high as 9559Â mAh gâ1 at 57Â mAÂ gâ1 and remains a high-rate capability of 3988Â mAh gâ1 at an increased current density of 285Â mAÂ gâ1. Benefiting from the well-designed cathode structure, the battery can be stably operated for 150 cycles with a stable voltage profile and voltage efficiency up to 65%. The well-designed graphene has a potential to be a superior free-standing cathode to other carbon-based materials due to its good combination of its hierarchical and porous structure, large surface area, abundant defects and excellent mechanical stability.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Xin Ji, Xingbao Zhu, Xiqiang Huang, Yuanguo Wu, Weihua Wan, Tian Yang, Yingzhang Yan, Yu Wang, Zhe Lü,