钪
介电谱
电化学
兴奋剂
阴极
钠离子电池
材料科学
电导率
分析化学(期刊)
快离子导体
电解质
化学工程
化学
电极
冶金
光电子学
色谱法
物理化学
法拉第效率
工程类
作者
Kangyi Chen,Qingmo Shi,Yue Wang,Xinghai Li,Yingying Jiang,Haoran Xu,Shilong Guo,Li Zhao,Changsong Dai
标识
DOI:10.1016/j.colsurfa.2023.130996
摘要
A lately proposed NASICON-structured Na3MnTi(PO4)3 (NMTP) provides a promising solution that enables a large theoretical specific capacity and a high voltage discharge platform. However, it encounters a difficulty in electronic conductivity which obstructs its further implements. Herein, in this work we propose the Sodium-ion battery cathode materials Na3Mn1−xScxTi(PO4)3/C with different Sc contents (x = 0, 0.01, 0.03, 0.05, 0.07, 0.1), a potential cathode material for sodium-ion batteries with typical three-dimensional NASICON structure were synthesized by sol-gel method aiming to address the problem. Doping of Sc3+ in the NMTP structure was proved by powder X-ray diffraction and energy dispersive X-ray spectroscopy techniques. Impedance spectroscopy and galvanostatic intermittent titration technique results suggest that appropriate-proportion doping has dramatically enhanced the electrical conductivity and Na ion migration of the NMTP matrix. Na3Mn0.95Sc0.05Ti(PO4)3 exhibited a higher initial discharge specific capacity (123 mA h /g at 0.2 C, 111 mA h /g at 1 C) and the highest cycling stability (capacity retention of 93% after 250cycles at 0.2 C, capacity retention of 88% after 500 cycles at 1 C). In addition, Electrochemical Impedance Spectroscopy and X-ray diffraction tests revealed the reasons for the improved cycling stability of the materials due to doping. Furthermore, Na3Mn0.95Sc0.05Ti(PO4)3//hard carbon full cells also demonstrates ideal electrochemical properties.
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