材料科学
四方晶系
阴极
兴奋剂
相(物质)
电化学
化学工程
离子
磷酸钠
钛
电压
钠
电极
光电子学
化学
物理化学
冶金
电气工程
有机化学
工程类
作者
Shuai Tong,Hong Pan,Huan Liu,Xiaoyu Zhang,Xiangyu Liu,Min Jia,Yahao Kang,Yue Yuan,Xiang Du,Xiaohong Yan
出处
期刊:Chemsuschem
[Wiley]
日期:2023-06-16
卷期号:16 (15)
被引量:5
标识
DOI:10.1002/cssc.202300244
摘要
Polyanionic material, specifically the NASICON-type material, is considered a promising cathode material for Na-ion batteries (SIBs) because of its stable structure and high operating voltage. Further, it improves the energy density correlated with the well utilization of all Na in the compound. For Na3 V2 (PO4 )2 F3 (NVPF), the extraction of the third Na, reported as the electrochemical inactivated, can be realized at a high voltage region while forming an irreversible tetragonal phase. In this study, we introduce Ti doping to the Na2 VTi(PO4 )2 F3 (NVTPF) material; we reveal that the Ti-doped NVTPF could effectively suppress the irreversible phase transformation, thus successfully harnessing Na in a wide voltage range. Experimental study discloses that the Ti-substituted Na2 VTi(PO4 )2 F3 could take up the Na+ from Amam phase to Cmc21 phase between 1.0 V and 4.8 V reversibly accounting for the 2 Na+ transportation that shows favorable Na+ kinetics and structural stability. Our research provides the strategy to stabilize the polyanion structure upon charging at a high voltage range and inspires the utilization of full sodium in the polyanionic materials, which could be considered as a material design for future conventional applications.
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