期刊
ADVANCED FUNCTIONAL MATERIALS
卷 30, 期 10, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201908680
关键词
cathode materials; NASICON structure; sodium-ion batteries; symmetric cell; three-electron redox reaction
类别
资金
- Office of Vehicle Technologies of the U.S. Department of Energy through the Advanced Battery Materials Research (BMR) Program (Battery 500 Consortium) [DE-EE0007762]
- National Natural Science Foundation of China [51602023]
- State Key Laboratory of New Ceramics and Fine Processing of Tsinghua University [KF201816]
- China Scholarship Council (CSC)
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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