以纳米Cr₂O₃和Na₂CO₃为原料,采用高温固相反应法制备NaCrO₂粉末。通过XRD研究了配碱量、固相反应温度和保温时间对NaCrO₂含量的影响,并利用SEM对NaCrO₂的形貌进行了表征。结果表明,当Na₂CO₃配碱量为理论配碱量的102%、反应温度为900℃及保温时间为5 h时,反应产物为单一的NaCrO₂,且NaCrO₂的质量分数达99.69%。反应产物呈层状结构,无明显团聚现象,颗粒尺寸为1~80 μm。

Sodium chromate (NaCrO₂) is a potential cathode material for sodium-ion batteries due to its low cost,safety,and high power.Solid-state reaction has been widely employed as the standard procedure to prepare oxide-type cathode materials for sodium-ion batteries.In this study,NaCrO₂ powder is prepared by high-temperature solid-phase reaction method with nano-Cr₂O₃ and Na₂CO₃ as feedstocks.The effect of base dosage,solid phase reaction temperature and insulation time on NaCrO₂ content are investigated by XRD,and the morphology of NaCrO₂ is characterized by means of SEM.It is shown that NaCrO₂ is the single reaction product with a purity of 99.69% when the dosage of Na₂CO₃ is 102% of the theoretical one,the reaction temperature remains at 900℃ and the holding time is 5 h.The obtained NaCrO₂ products show a layered structure without obvious agglomeration,with a particle size in the range of 1-80 μm.

袁小超(1986-),男,本科,工程师,研究方向为铬系材料,29108690@qq.com