期刊
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
卷 46, 期 10, 页码 14570-14580出版社
WILEY
DOI: 10.1002/er.8090
关键词
coprecipitation method; depolarization role; NaxMnyAlzO2 polynary metal oxide; reed-leaves like; sodium-ion battery
资金
- Science and Technology General Project of Liaoning Province Education Department [LQ2020009, LZ2020002]
- Support Program of Distinguished Professor of Liaoning Province [071717002]
- Distinguished Professor of Liaoning Province
- National Natural Science Foundation of China [22075030]
In this study, Al-doped manganese oxide with presetting sodium-ion (NaxMnyAlzO2) was synthesized and combined with Na3V2(PO4)(3) cathode active materials to optimize the electrochemical performances of sodium-ion batteries. The reed-leaves like NaxMnyAlzO2 polynary metal oxide exhibited excellent reversibility and low electrochemical impedance, and showed a specific discharge capacity of 73.76 F g(-1) at 100 mA g(-1) current density.
In this paper, Al-doped manganese oxide with presetting sodium-ion (NaxMnyAlzO2) is synthesized by a facile coprecipitation method and combines with Na3V2(PO4)(3) cathode active materials for sodium-ion battery in order to optimize the electrochemical performances. During the coprecipitation, a stable NaxMnyAlzO2 polynary metal oxide with Mn and Al molar ratio to 3:1 shows a special micromorphology similar to that of reed leaves, which makes it have a more ideal electrochemical specific surface area and ample mass transfer channels for rapid sodium-ion insertion and desorption. Electrochemical test indicates that reed-leaves like NaxMnyAlzO2 polynary metal oxides as active material for sodium-ion capacitor exhibit a very excellent reversibility and low electrochemical (R-ct = 434 omega) and concentration polarization (DNa+ = 2.2728 x 10(-11) cm(2) s(-1)). Specific discharge capacity can achieve to 73.76 F g(-1) at 100 mA g(-1) current density corresponding to 368.8 m(2) g(-1) electrochemical specific surface area. After 200 cycles, the capacity retention rate can be maintained at 81.81%. In addition, reed-leaves like NaxMnyAlzO2 polynary metal oxide playing a good depolarization role combined with Na3V2(PO4)(3) active materials in the mass ratio to 7:3 can bring about the most excellent electrochemical performances.
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