Journal
FUNCTIONAL MATERIALS LETTERS
Volume 15, Issue 3, Pages -Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S1793604722500163
Keywords
Carbon materials; N/O co-doped; energy storage and conversion; K-ion batteries; electrical properties
Categories
Funding
- National Natural Science Foundation of China [21601122, 21671128]
- Belt and Road Initiatives International Cooperation Project [20640770300]
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This study further investigated the potassium storage performance of nitrogen/oxygen dual dopant porous hollow carbon nanocapsules (N/O-CNCs). The results showed that N/O-CNCs exhibited excellent potassium storage capabilities at different rates, demonstrating remarkable rate performance and cycle stability.
Based on our observations made in our previous work that nitrogen (N)/oxygen (O) dual dopant porous hollow carbon nanocapsules (N/O-CNCs) have state-of-the-art lithium storage and sodium storage capabilities, we further studied their potassium storage performance in this study. It was found that for potassium storage, 259 mA h g(-1) at 0.05 A g(-1) can be retained up to 100 cycles, and 107 mA h g(-1) at 1 A g(-1) can be retained after 100 cycles. Even at 2 A g(-1), an excellent rate capability of 73.4 mA h g(-1) in K-ion batteries (KIBs) was delivered. A capacitive charge-storage mechanism dominated the potassium storage of N/O-CNCs at high rates during the potassiation/depotassiation process through kinetics analysis, ensuring a remarkable rate performance.
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