Journal
ACS APPLIED ENERGY MATERIALS
Volume 4, Issue 6, Pages 5888-5896Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c00691
Keywords
confinement effect; transition-metal oxides; hierarchical porous carbon; long cycling; sodium-ion batteries
Funding
- National Key Research and Development Program of China [2016YFA0203700]
- National Natural Science Foundation of China [51672083, 51962022, 52072124]
- Natural Science Foundation of Shanghai [20ZR1414900]
- Program of Shanghai Academic/Technology Research Leader [18XD1401400]
- Program for a Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
- 111 Project [B14018]
- Leading Talents in Shanghai in 2018
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This study developed a nitrogen-doped hierarchical porous carbon nanospheres with a movable Fe2O3 core for enhanced electrical performance in sodium-ion batteries. The material exhibited excellent long cycling stability and ultrafast intercalation/deintercalation speed, especially at high current density.
Though great progresses have been made on improving the volume effect and electronic conductivity of anode materials in sodium-ion batteries (SIBs), the electrical performance at high current density for long cycling stability is still a huge challenge. To address this, a facile confined-impregnation/crystallization strategy is developed to construct a movable Fe2O3 core in nitrogen-doped hierarchical porous carbon nanospheres (MFe2O3@N-HCNs) for ultrafast intercalation/deintercalation of SIBs. The as-prepared MFe2O3@N-HCNs not only exhibit a connected and hierarchal porous structure with large surface specific area (similar to 367 m(2) g(-1)) but also possess a highly dispersed and moveable Fe2O3 core (similar to 5 nm) for the tolerance of volume expansion during the intercalation/deintercalation process of sodium ions. As SIBs anode materials, the MFe2O3@N-HCNs anode exhibits a capacity of 417 mAh g(-1) at 0.1 A g(-1) after 100 cycles and of 364 mAh g(-1) at 2 A g(-1) with 4500 cycles. Especially, a prominent discharge capacity of 102 mAh g(-1) is still obtained at 5 A g(-1) after 10000 cycles. Such remarkable performances should be attributed to the unique highly dispersed and moveable Fe2O3 core and conductive nitrogen-doped hierarchical porous carbon framework with large surface area. Consequently, this study develops a facile methodology to promote the energy storage and long cycling performance of hierarchically porous carbon@transition-metal oxide (TMO) composite anode materials for SIBs, especially at high current density.
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