Three Electron Reversible Redox Reaction in Sodium Vanadium Chromium Phosphate as a High-Energy-Density Cathode for Sodium-Ion Batteries

被引：151
作者：
Zhao, Yongjie [1 ,2 ,3 ]
Gao, Xiangwen [2 ,3 ]
Gao, Hongcai [2 ,3 ]
Jin, Haibo [1 ]
Goodenough, John B. [2 ,3 ]
机构：
[1] Beijing Inst Technol, Sch Mat Sci & Engn, Beijing Key Lab Construct Tailorable Adv Funct Ma, Beijing 100081, Peoples R China
[2] Univ Texas Austin, Mat Sci & Engn Program, Austin, TX 78712 USA
[3] Univ Texas Austin, Texas Mat Inst, Austin, TX 78712 USA
来源：
ADVANCED FUNCTIONAL MATERIALS | 2020年 / 30卷 / 10期
基金：
中国国家自然科学基金;
关键词：
cathode materials; NASICON structure; sodium-ion batteries; symmetric cell; three-electron redox reaction; CARBON MATRIX; STORAGE; NA3V2(PO4)(3); PERFORMANCE; NA3VCR(PO4)(3); NA;
D O I：
10.1002/adfm.201908680
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
A sodium-ion battery operating at room temperature is of great interest for large-scale stationary energy storage because of its intrinsic cost advantage. However, the development of a high capacity cathode with high energy density remains a great challenge. In this work, sodium super ionic conductor-structured Na3V2-xCrx(PO4)(3) is achieved through the sol-gel method; Na3V1.5Cr0.5(PO4)(3) is demonstrated to have a capacity of 150 mAh g(-1) with reversible three-electron redox reactions after insertion of a Na+, consistent with the redox couples of V2+/(3+), V3+/(4+), and V4+/(5+). Moreover, a symmetric sodium-ion full cell utilizing Na3V1.5Cr0.5(PO4)(3) as both the cathode and anode exhibits an excellent rate capability and cyclability with a capacity of 70 mAh g(-1) at 1 A g(-1). Ex situ X-ray diffraction analysis and in situ impedance measurements are performed to reveal the sodium storage mechanism and the structural evolution during cycling.
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页数：7
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