期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 3, 页码 3116-3124出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b19637
关键词
sodium-ion batteries; NaTi2(PO4)(3); anion doping; F-doping sodium-ion full cell
资金
- National Natural Science Foundation of China [51772117, 51732005]
- National Key R&D Program of China [2016YFB0700600, 2016YFB010030X]
- State Key Laboratory of Materials Processing and Die & Mould Technology of HUST
We are presenting a sol-gel method for building novel nanostructures made of nanosized F-doped Na1-2x Ti-2(PO4)(3-x)F-x (NTP-F-x, x = 0, 0.02, 0.05, and 0.10) particles embedded in three-dimensional (3D) carbon matrices (NTP-F-x/C). This technique combines advantages of both zero-dimensional materials and 3D carbon networks. Proper fluorine doping stabilizes the NTP structure and greatly enhances ion/electron transportation, leading to superhigh-rate electrochemical performance and ultralong cycle life. The composite electrode delivers high specific capacities of 121, 115, 112.2, 110.1, 107.7, 103.1, 85.8, and 62.5 mA h g(-1) at 0.2, 0.5, 1, 2, 5, 10, 20, and 30 C, respectively. It retains an unbelievable similar to 70% capacity after a thousand cycles at a rate as high as 10 C. Electroanalytical results reveal that fluorine doping significantly enhances Na+ diffusion kinetics. Meanwhile, density functional theory calculations demonstrate F-doped NTPs' own outstanding electrochemical properties, which is due to the enhanced intrinsic ionic/electronic conductivity. The results show that anion doping is an efficient way to make high-performance NTP anodes for sodium-ion batteries.
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