Enhanced Capacity and Rate Capability of Nitrogen/Oxygen Dual‐Doped Hard Carbon in Capacitive Potassium‐Ion Storage
Shandong University · China University of Mining and Technology · +1 more institution
Abstract
Abstract The intercalation of potassium ions into graphite is demonstrated to be feasible, while the electrochemical performance of potassium‐ion batteries (KIBs) remains unsatisfying. More effort is needed to improve the specific capacity while maintaining a superior rate capability. As an attempt, nitrogen/oxygen dual‐doped hierarchical porous hard carbon (NOHPHC) is introduced as the anode in KIBs by carbonizing and acidizing the NH 2 ‐MIL‐101(Al) precursor. Specifically, the NOHPHC electrode delivers high reversible capacities of 365 and 118 mA h g −1 at 25 and 3000 mA g −1 , respectively. The capacity retention reaches 69.5% at 1050 mA g −1 for 1100 cycles. The reasons for the enhanced electrochemical…
Citation impact
- FWCI
- 50.71
- Percentile
- 100%
- References
- 88
Authors
7Topics & keywords
- Materials science
- Heteroatom
- Anode
- Electrochemistry
- Capacitance
- Chemical engineering
- Carbon fibers
- Carbonization