采用络合剂辅助共沉淀法合成了不同Fe/Ni比值的铁镍普鲁士蓝化合物(FeNiHCF)粉末,并将制得的FeNiHCF粉末进行了储锂性能探究,利用X射线衍射(XRD)、X光电子能谱(XPS)和扫描电镜(SEM)对于材料的微观结构和形貌进行表征,使用蓝电系统进行恒流充放电测试表征材料的储锂性能。结果表明:不同Fe/Ni比值的掺杂会影响材料的储锂性能及循环稳定性,总体而言,随着镍离子掺杂量的增加,材料的循环稳定性不断上升,但容量有一定的下降。在m(FeCl3·6H2O)∶m(NiCl2·6H2O)=1∶4,1C的电流密度下,首次放电比容量为46.2mAh/g,经500圈循环后放电比容量仍达47.6mAh/g。同时,经过20C的高循环倍率测试后,电流密度回到1C时,比容量仍能恢复到倍率性能测试前,表现出了优异的倍率性能。
Iron-nickel Prussian blue compound (FeNiHCF) powders with different Fe/Ni ratios were synthesized by complexing agent-assisted co-precipitation method,and the lithium storage properties of the obtained FeNiHCF powder were explored.The microstructure and morphology of the materials were characterized by XRD,XPS and SEM,and the lithium storage properties of the materials were measured by constant current charge-discharge tests using blue electric system.The results showed that the doping with different Fe/Ni ratios affected the lithium storage performance and cycle stability of the material.In general,with the increase of nickel ion doping,the cycle stability of the material continued to increase,but the capacity decreased to a certain extent.Under the condition of m(FeCl3·6H2O)∶m(NiCl2·6H2O)=1∶4 and a current density of 1C,the specific capacity of the initial discharge was 46.2mAh/g,and the discharge specific capacity still reached 47.6mAh/g after 500 cycles.At the same time,after the high cycle rate test of 20C,when the current density returned to 1C,the specific capacity could still be restored to the previous rate performance,showing excellent rate performance.
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基金资助
新疆杰出青年科技人才培养项目(2020Q003);新疆天山英才项目(2023TSYCLJ0008)
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