Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 8, Issue 11, Pages 5671-5678Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta14226f
Keywords
-
Funding
- National Natural Science Foundation of China [51672188]
- Natural Science Foundation of Tianjin City [16JCYBJC40900]
Ask authors/readers for more resources
Dendritic growth is a major obstacle for the development of potassium metal anodes in K-ion batteries, which causes low coulombic efficiency, poor cycling stability and safety hazards. Herein, we report a 3D SnO2-coated conductive porous carbon nanofiber (PCNF) framework (PCNF@SnO2) as a host for K metal anodes. The SnO2 coating layer has a higher binding energy with K than with carbon and makes the PCNF framework highly potassiphilic, which regulates uniform K nucleation and deposition and suppresses dendritic growth. In addition, the interconnected 3D structure of the PCNF framework provides a large amount of void space and a robust structure to accommodate a large amount of K (87% @ 15 mg cm(-2)) and alleviate the stress/strain caused by volume expansion during plating/stripping. The PCNF@SnO2-K composite anode demonstrates an ultralong cycling stability of 1700 h at 1 mA cm(-2), which is superior to those of other K metal anodes and even comparable with those of Li metal anodes reported in the literature. More importantly, enhanced performance is also achieved in a full cell using the composite K metal anode. Our results highlight a promising strategy for the development of stable and safe K metal anodes in KIBs.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available