Fast and stable potassium-ion storage achieved by in situ molecular self-assembling N/O dual-doped carbon network

Nitrogen and oxygen dual-doped amorphous carbon network (NOCN) facilely prepared via self-assembly method in this study as potassium ion battery' anode for ultra-long and superior-rate capability. The as-synthesized NOCN exhibits an excellent reversible capacity of 464.9 mAh g(-1) at 0.05 A g(-1), outstanding performance of 175 mAh g(-1) at a high current density of 5.0 A g(-1), and ultra-long cycling performance with capacity decay less than 0.008% per cycle. The superior performance can be attributed to the unique ultra-stable network structure together with N and O co-doped. Supported by detailed fundamental analysis, the higher K-ion storage process in NOCN is contributed by the pseudocapacitive mechanism. The simple synthesis route as well as the hopeful electro-chemical property shed a new insight into the quest for carbon-based K-storage anode materials with high energy and long-cycling life.