钠离子电池正极材料锰酸钠的合成及其性能研究  

Synthesis and performance of sodium manganate as cathode material for sodium-ion batteries

作　　者：韩业璘 谢红艳[1,2,3] Han Yelin;Xie Hongyan(School of Materials and Metallurgy,Guizhou University,Guiyang 550025;Guizhou Provincial Key Laboratory of Metallurgical Engineering and Process Energy Conservation,Guiyang 550025;Key Laboratory of High Performance Battery Materials,Guizhou Provincial Universities,Guiyang 550025)

机构地区：[1]贵州大学材料与冶金学院,贵阳550025 [2]贵州省冶金工程与过程节能重点实验室,贵阳550025 [3]贵州省高等学校高性能电池材料重点实验室,贵阳550025

出　　处：《化工新型材料》2025年第2期112-116,122,共6页New Chemical Materials

基　　金：国家自然科学基金地区基金(52364045)。

摘　　要：以软锰矿为原料,通过酸浸碱浸并结合高温固相法合成了钠离子电池正极材料锰酸钠(化学式Na_(0.44)MnO_(2)),通过X射线衍射仪、扫描电子显微镜、能量色散谱仪、X射线光电子能谱仪以及恒流充放电测试、电化学阻抗和循环伏安等测试方法,分析了Na_(0.44)MnO_(2)的晶体结构、微观形貌和电化学性能等。结果表明:制备的Na_(0.44)MnO_(2)为结晶良好的棒状结构,宽度为200~400nm,长度为2~5μm;在0.5C和1C倍率条件下首圈放电比容量分别为117.5mAh/g、84.8mAh/g,循环100圈后容量保持率约为90%。Sodium manganate(chemical formula Na_(0.44)MnO_(2)),a cathode material for sodium-ion batteries,was synthesized from pyrolusite by acid leaching and alkaline leaching combined with high-temperature solid-phase method.The crystal structure,microstructure and electrochemical properties of Na_(0.44)MnO_(2)were analyzed by XRD,SEM,EDS,XPS,constant-current charging-discharge test,electrochemical impedance spectroscopy(EIS)and cyclic voltammetry(CV).The results showed that the prepared Na_(0.44)MnO_(2)exhibited a well-crystallized rod-like structure with a width of 200~400nm and a length of 2~5μm.At 0.5C and 1C,the discharge specific capacity of the first circle was 117.5mAh/g and 84.8mAh/g,respectively,and the capacity retention rate was about 90%after 100 cycles.

关 键 词：软锰矿 高温固相法 锰酸钠 电化学性能 

分 类 号：TM911[电气工程—电力电子与电力传动]