Journal
ADVANCED MATERIALS
Volume 31, Issue 2, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201805430
Keywords
long cyclic life; porous carbon; potassium-ion batteries; sodium-ion batteries; ultrafast charge storage
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Funding
- Natural Science Foundation of China [51732005, 51772008]
- National Key Research and Development Program of China [2017YFA0206701]
- National Program for Support of Top-notch Young Professionals
- Changjiang Scholar Program
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The large-scale application of sodium/potassium-ion batteries is severely limited by the low and slow charge storage dynamics of electrode materials. The crystalline carbons exhibit poor insertion capability of large Na+/K+ ions, which limits the storage capability of Na/K batteries. Herein, porous S and N co-doped thin carbon (S/N@C) with shell-like (shell size approximate to 20-30 nm, shell wall approximate to 8-10 nm) morphology for enhanced Na+/K+ storage is presented. Thanks to the hollow structure and thin shell-wall, S/N@C exhibits an excellent Na+/K+ storage capability with fast mass transport at higher current densities, leading to limited compromise over charge storage at high charge/discharge rates. The S/N@C delivers a high reversible capacity of 448 mAh g(-1) for Na battery, at the current density of 100 mA g(-1) and maintains a discharge capacity up to 337 mAh g(-1) at 1000 mA g(-1). Owing to shortened diffusion pathways, S/N@C delivers an unprecedented discharge capacity of 204 and 169 mAh g(-1) at extremely high current densities of 16 000 and 32 000 mA g(-1), respectively, with excellent reversible capacity for 4500 cycles. Moreover, S/N@C exhibits high K+ storage capability (320 mAh g(-1) at current density of 50 mA g(-1)) and excellent cyclic life.
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