Impacts of fluorine in NASICON‐type materials as cathodes for aqueous zinc ion batteries
Impacts of fluorine in NASICON‐type materials as cathodes for aqueous zinc ion batteries
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DOI：
10.1002/ese3.925
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发表时间：
2021-05
影响因子：
3.8
通讯作者：
Ziyan Liu;Xiaoxiao Jia;G. Cao
中科院分区：
文献类型：
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作者：
Ziyan Liu;Xiaoxiao Jia;G. Cao
钠超离子导体（NASICON）型材料由于其高容量和良好的循环能力而受到越来越多的关注，与其他正极材料相比，其在水溶液锌离子电池（AZIB）中的应用。研究了两种NASICON化合物Na 3V 2（PO 4）3和Na 3V 2（PO 4）2F 3的合成及电化学性能，并探讨了氟对NASICON化合物电化学性能的影响。Na 3V 2（PO 4）3和Na 3V 2（PO 4）2F 3都是通过水热生长然后在800°C下在惰性气体中退火来合成的。以3 mol/L Zn（CF 3SO 3）2水溶液为电解质，Na 3V 2（PO 4）3具有较高的储能容量，而Na 3V 2（PO 4）2F 3具有较高的放电电压，但储能容量较低。研究还发现，随着循环次数的增加，Na 3V 2（PO 4）2F 3的存储容量增加;然而，该化合物经历逐渐的相变。讨论了获得高放电电压和大容量同时具有良好循环稳定性的可能途径。
Sodium superionic conductor (NASICON)‐type materials are getting more and more attention due to their high capacity and good cycling ability compared with other cathode materials in aqueous zinc ion batteries (AZIB). The present paper was to study the synthesis and electrochemical properties of two NASICON compounds of Na3V2(PO4)3 and Na3V2(PO4)2F3 and to understand the impacts of fluorine. Both Na3V2(PO4)3 and Na3V2(PO4)2F3 are synthesized by hydrothermal growth followed with annealing at 800°C in inert gas. With 3 mol/L Zn(CF3SO3)2 in water as electrolyte, Na3V2(PO4)3 offered a high storage capacity, while Na3V2(PO4)2F3 demonstrated a high discharge voltage though low storage capacity. It was also found that the storage capacity of Na3V2(PO4)2F3 increases with increased cycles; however, the compound undergoes a gradual phase transition. It is discussed possible approaches to attain both high discharge voltage and large capacity with good cycling stability.