镍基类普鲁士蓝钠离子电池正极材料的制备及其电化学储钠性能

Preparation and Electrochemical Performance of Nickel BasedPositive Electrode Materials for PBS Batteries

以亚铁氰化钠、氯化镍、柠檬酸钠、聚乙烯吡咯烷酮和氯化钠为原料,采用改进的共沉淀法制备低缺陷、钠含量高的镍基类普鲁士蓝正极材料。通过XRD对材料的晶型进行分析,借助SEM和TEM对该种材料的结构表征,通过恒流充放电、循环伏安测试、交流阻抗测试等方法对材料进行电化学性能测试,结果表明该材料在0.1 A/g电流密度下最大比容量可达104.9 mAh/g,并在循环800次后比容量仍可保持在95 mAh/g以上,容量保持率在90.5%以上,证明了该种镍基类普鲁士蓝正极材料具有较为优异的性能。

A nickel based Prussian Blue cathode material with low defects and high sodium content was prepared by using an improved co-precipitation method with the raw material of sodium ferrocyanide,nickel chloride,sodium citrate,polyvinyl pyrrolidone,and sodium chloride.The crystal form and structure of the material was tested by XRD,SEM and TEM respectively.The electrochemical performance of the material was tested through constant current charging and discharging,cyclic voltammetry testing and AC impedance testing.The results showed that the maximum specific capacity of the material can reach 104.9 mAh/g at a current density of 0.1 A/g,and after 800 cycles,the specific capacity can still be maintained above 95 mAh/g,with a capacity retention rate of over 90.5%.This proved that the nickel based Prussian Blue cathode material has excellent performance.