Sodium/Potassium-Ion Batteries: Boosting the Rate Capability and Cycle Life by Combining Morphology, Defect and Structure Engineering

被引:457
|
作者
Huang, Huijuan [1 ]
Xu, Rui [1 ]
Feng, Yuezhan [2 ]
Zeng, Sifan [1 ]
Jiang, Yu [1 ]
Wang, Huijuan [3 ]
Luo, Wei [4 ]
Yu, Yan [1 ,5 ,6 ]
机构
[1] Univ Sci & Technol China, Dept Mat Sci & Engn, CAS Key Lab Mat Energy Convers, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China
[2] Zhengzhou Univ, Minist Educ, Key Lab Mat Proc & Mold, Zhengzhou 450002, Peoples R China
[3] Univ Sci & Technol China, Expt Ctr Engn & Mat Sci, Hefei 230026, Peoples R China
[4] Donghua Univ, Coll Mat Sci & Engn, State Key Lab Modificat Chem Fibers & Polymer Mat, Shanghai 201620, Peoples R China
[5] Chinese Acad Sci, Dalian Natl Lab Clean Energy DNL, Dalian 116023, Liaoning, Peoples R China
[6] Univ Sci & Technol China, State Key Lab Fire Sci, Hefei 230026, Anhui, Peoples R China
基金
中国国家自然科学基金;
关键词
nitrogen-doped carbon; potassium-ion batteries; sodium-ion batteries; CARBON NANOSHEETS; HIGH-CAPACITY; ELECTROCHEMICAL PERFORMANCE; ANODE MATERIALS; ENERGY-STORAGE; POROUS CARBON; HARD CARBONS; NITROGEN; OPTIMIZATION; ELECTROLYTE;
D O I
10.1002/adma.201904320
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Carbon-based materials have been considered as the most promising anode materials for both sodium-ion batteries (SIBs) and potassium-ion batteries (PIBs), owing to their good chemical stability, high electrical conductivity, and environmental benignity. However, due to the large sizes of sodium and potassium ions, it is a great challenge to realize a carbon anode with high reversible capacity, long cycle life, and high rate capability. Herein, by rational design, N-doped 3D mesoporous carbon nanosheets (N-CNS) are successfully synthesized, which can realize unprecedented electrochemical performance for both SIBs and PIBs. The N-CNS possess an ultrathin nanosheet structure with hierarchical pores, ultrahigh level of pyridinic N/pyrrolic N, and an expanded interlayer distance. The beneficial features that can enhance the Na-/K-ion intercalation/deintercalation kinetic process, shorten the diffusion length for both ions and electrons, and accommodate the volume change are demonstrated. Hence, the N-CNS-based electrode delivers a high capacity of 239 mAh g(-1) at 5 A g(-1) after 10 000 cycles for SIBs and 321 mAh g(-1) at 5 A g(-1) after 5000 cycles for PIBs. First-principles calculation shows that the ultrahigh doping level of pyridinic N/pyrrolic N contributes to the enhanced sodium and potassium storage performance by modulating the charge density distribution on the carbon surface.
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页数:11
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