1. Amorphous Phosphorus/Nitrogen-Doped Graphene Paper for Ultrastable Sodium-Ion Batteries.
- Author
-
Chao Zhang, Xi Wang, Qifeng Liang, Xizheng Liu, Qunhong Weng, Jiangwei Liu, Yijun Yang, Zhonghua Dai, Kejian Ding, Yoshio Bando, Jie Tang, and Golberg, Dmitri
- Subjects
- *
PHOSPHORUS , *GRAPHENE , *AMORPHOUS substances , *NITROGEN , *DOPING agents (Chemistry) , *SODIUM ions , *ELECTROCHEMICAL electrodes - Abstract
As the most promising anode material for sodium-ion batteries (SIBs), elemental phosphorus (P) has recently gained a lot of interest due to its extraordinary theoretical capacity of 2596 mAh/g. The main drawback of a P anode is its low conductivity and rapid structural degradation caused by the enormous volume expansion (>490%) during cycling. Here, we redesigned the anode structure by using an innovative methodology to fabricate flexible paper made of nitrogen-doped graphene and amorphous phosphorus that effectively tackles this problem. The restructured anode exhibits an ultrastable cyclic performance and excellent rate capability (809 mAh/g at 1500 mA/g). The excellent structural integrity of the novel anode was further visualized during cycling by using in situ experiments inside a high-resolution transmission electron microscope (HRTEM), and the associated sodiation/desodiation mechanism was also thoroughly investigated. Finally, density functional theory (DFT) calculations confirmed that the N-doped graphene not only contributes to an increase in capacity for sodium storage but also is beneficial in regards to improved rate performance of the anode. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF