期刊
NANO LETTERS
卷 16, 期 3, 页码 2054-2060出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b00057
关键词
amorphous phosphorus; phase-transformation; sodium-ion battery; in-situ TEM; anode
类别
资金
- International Center for Young Scientists (ICYS)
- World Premier International (WPI) Research Center on Materials Nanoarchitectonics (MANA)
- MEXT, Japan
- 1000-Youth Talents Plan
- NSFC [11574215]
- SRF for ROCS, SEM
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.
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