材料科学
阳极
兴奋剂
纳米复合材料
氟
扩散
电化学
纳米技术
离子
复合数
电导率
化学工程
分析化学(期刊)
电极
物理化学
光电子学
复合材料
化学
热力学
有机化学
工程类
物理
冶金
作者
Peng Wei,Yanxiang Liu,Yarui Su,Miao Liu,Yangyang Huang,Yi Liu,Yuegang Qiu,Yuyu Li,Xiaoyu Zhang,Yue Xu,Xueping Sun,Chun Fang,Qing Li,Jiantao Han
标识
DOI:10.1021/acsami.8b19637
摘要
We are presenting a sol–gel method for building novel nanostructures made of nanosized F-doped Na1–2xTi2(PO4)3–xFx (NTP-Fx, x = 0, 0.02, 0.05, and 0.10) particles embedded in three-dimensional (3D) carbon matrices (NTP-Fx/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 ∼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.
科研通智能强力驱动
Strongly Powered by AbleSci AI