钒
材料科学
水热合成
阴极
电化学
相(物质)
化学
分析化学(期刊)
热液循环
化学工程
结晶学
纳米技术
冶金
工程类
电极
物理化学
有机化学
色谱法
作者
Yuruo Qi,Junmei Zhao,Chao Yang,Huizhou Liu,Yong‐Sheng Hu
标识
DOI:10.1002/smtd.201800111
摘要
Abstract Sodium vanadium fluorophosphate, Na 3 (VO 1− x PO 4 ) 2 F 1+2 x (0 ≤ x ≤ 1), is proved to be a series of very promising cathode materials for Na‐ion batteries, owing to the high operating voltage and structural stability. However, the selective preparation of phase‐pure Na 3 (VO 1− x PO 4 ) 2 F 1+2 x (0 ≤ x ≤ 1) with outstanding electrochemical performance still remains a big challenge. Moreover, there are lots of discrepancies concerning the Na‐storage properties, including a diversity of voltage profiles and capacities reported, based on the variety of synthetic methods. Herein, a comprehensive investigation is conducted about the fabrication of phase‐pure Na 3 (VO 1− x PO 4 ) 2 F 1+2 x (0 ≤ x ≤ 1) by employing different starting materials and corresponding synthetic conditions, based on a facile low‐temperature hydrothermal strategy. Results show that the pH in the reaction system may be of vital importance for the successful preparation of Na 3 (VO 1− x PO 4 ) 2 F 1+2 x (0 ≤ x ≤ 1) with special microarchitecture. Furthermore, it is found that NaH 2 PO 4 ·2H 2 O is the most appropriate phosphorus source, while VCl 3 , VOSO 4 · x H 2 O, and NH 4 VO 3 are the best choices of vanadium sources to prepare Na 3 (VO 1− x PO 4 ) 2 F 1+2 x (0 ≤ x ≤ 1) with superior Na‐storage performance. This is the first time that the underlying correlations between the starting materials and the Na‐storage performance, are investigated and further that guidance for the selective synthesis of phase‐pure Na 3 (VO 1− x PO 4 ) 2 F 1+2 x (0 ≤ x ≤ 1) with superior performance is provided.
科研通智能强力驱动
Strongly Powered by AbleSci AI