Journal
ADVANCED ENERGY MATERIALS
Volume 8, Issue 25, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201801149
Keywords
anodes; carbon nanocages; cyclability; potassium-ion batteries; rate capability
Categories
Funding
- National Natural Science Foundation of China [U1610252]
- National Key Research and Development Program of China [2017YFB0102204]
- Australian Research Council [DP170102406]
- Graduate School of Beijing University of Chemical Technology
Ask authors/readers for more resources
As an emerging electrochemical energy storage device, potassium-ion batteries (PIBs) have drawn growing interest due to the resource-abundance and low cost of potassium. Graphite-based materials, as the most common anodes for commercial Li-ion batteries, have a very low capacity when used an anode for Na-ion batteries, but they show reasonable capacities as anodes for PIBs. The practical application of graphitic materials in PIBs suffers from poor cyclability, however, due to the large interlayer expansion/shrinkage caused by the intercalation/deintercalation of potassium ions. Here, a highly graphitic carbon nanocage (CNC) is reported as a PIBs anode, which exhibits excellent cyclability and superior depotassiation capacity of 175 mAh g(-1) at 35 C. The potassium storage mechanism in CNC is revealed by cyclic voltammetry as due to redox reactions (intercalation/deintercalation) and double-layer capacitance (surface adsorption/desorption). The present results give new insights into structural design for graphitic anode materials in PIBs and understanding the double-layer capacitance effect in alkali metal ion batteries.
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