纳米FeSe_(2)正极材料制备与镁电池中性能表征  

Preparation of FeSe_(2) nanoparticle cathode material and characterization of its performance in magnesium battery

作　　者：王利诚 徐昊 李钊[1,2] 邹建新 WANG Licheng;XU Hao;LI Zhao;ZOU Jianxin(Light Alloy Net Forming National Engineering Research Center-LAF-NERC,Shanghai Jiao Tong University,Shanghai 200240,China;Center of Hydrogen Science,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学轻合金精密成型国家工程研究中心,上海200240 [2]上海交通大学氢科学中心,上海200240

出　　处：《电源技术》2024年第4期725-731,共7页Chinese Journal of Power Sources

摘　　要：采用溶剂热法,利用表面活性剂的分散作用成功合成了FeSe_(2)纳米颗粒,将其作为正极材料组装可充镁电池,并进行电化学性能测试。结果显示,FeSe_(2)正极在100 mA/g电流密度下首次放电比容量为119 mAh/g,并在循环过程中展现出比容量的逐渐升高,在循环48次后获得最大放电比容量628 mAh/g,同时具有良好的循环稳定性,在100次循环后仍保持581 mAh/g的放电比容量。非原位TEM、XPS和同步辐射软X射线吸收谱分析表明,FeSe_(2)正极在循环过程中,铜集流体会参与正极电化学反应并形成含铜化合物,在正极材料中形成导电通路,这有利于电化学反应过程中电子的转移。因此,FeSe_(2)纳米颗粒充分参与正极转化反应,并展现出高容量和长循环稳定性,为镁电池中的集流体和硒族化合物的匹配性设计提供了新的思路。FeSe_(2) nanoparticles were synthesized by solvothermal method and dispersed by surfactant.The obtained FeSe_(2) nanoparticles were used as cathode materials to assemble rechargeable magne‐sium batteries and their electrochemical properties were tested.The results show that the discharge specific capacity of FeSe_(2) cathode is 119 mAh/g at 100 mA/g current density.It shows a gradually in‐creasing specific capacity during the cycle,and the maximum discharge specific capacity 628 mAh/g is obtained after 48 cycles.In addition,the FeSe_(2) cathode has good cycle stability and maintains the discharge specific capacity of 581mAh/g after 100 cycles.The analysis of ex-situ TEM,XPS and X-ray absorption spectroscopy show that during the cycle,the copper current collector will participate in the cathode electrochemical reaction and forms copper-containing compounds,forming a conduc‐tive path in the cathode material,which is beneficial to the transfer of electrons in the electrochemical reaction process.Therefore,FeSe_(2) nanoparticles fully participate in the cathode conversion reaction and show high capacity and long cycle stability.

关 键 词：可充镁电池 正极材料 FeSe_(2) 铜集流体 非原位表征 

分 类 号：TM912[电气工程—电力电子与电力传动]