溶胶-凝胶法合成Li1-xNaxMn2O4及其作为水系锂离子电池正极材料的电化学性能
Aqueous Li-Ion Battery Cathode Material Li1-xNaxMn2O4 Prepared by Sol-gel Method and Its Electrochemical Performance
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陶洪亮 南京航空航天大学材料科学与技术学院, 江苏省能量转换材料与技术重点实验室, 南京 210016  
米常焕 南京航空航天大学材料科学与技术学院, 江苏省能量转换材料与技术重点实验室, 南京 210016 mchmse@nuaa.edu.cn 
张迎霞 南京航空航天大学材料科学与技术学院, 江苏省能量转换材料与技术重点实验室, 南京 210016  
摘要: 用溶胶凝胶法合成了Na+离子掺杂的Li1-xNaxMn2O4x=0,0.01,0.03,0.05)。X射线衍射图表明Na+取代Li+进入Li1-xNax Mn2O4晶格中,扫描电镜图看出产物是粒径为100~300 nm的颗粒。恒流充放电测试结果表明,Li0.97Na0.03Mn2O4在2C倍率下循环100圈后放电容量保持率比未掺杂的LiMn2O4从51.2%提升到84.1%。循环伏安测试表明Na+离子掺杂降低了材料极化且增大了锂离子扩散系数。10C倍率下Li0.97Na0.03Mn2O4仍有79.0 mAh·g-1的放电容量,高于未掺杂样品的52.1 mAh·g-1。Na+离子掺杂可以稳定材料结构并提高锂离子扩散系数,从而提高LiMn2O4的电化学性能,是一种可行的改性方法。
关键词: 水系锂离子电池  Na+掺杂  LiMn2O4
基金项目: 中央高校基本科研业务费专项资金(No.NJ2016058)和江苏高校优势学科建设工程资助项目
Abstract: The Na-doped Li1-xNaxMn2O4(x=0,0.01,0.03,0.05) was successfully synthesized by a sol-gel method.X-ray diffraction showed Na is successfully doped into LiMn2O4 structure.SEM images showed the material is a uniform particle with 100~300 nm particle size.Galvanostatic charge/discharge results show the discharge capacity retention of Li0.97Na0.03Mn2O4 after 100 cycles at 2C was increased from 51.2% to 84.1% compared with that of undoped LiMn2O4.The results of cyclic voltammetry indicate that Na doping reduced the polarization and increased the diffusion coefficient of lithium ions.When the current density is increased to 10C,the doped sample still has a discharge capacity at 79.0 mAh·g-1,which is higher than that of the undoped sample (52.1 mAh·g-1).Na doping can stabilize the material structure and improve the diffusion coefficient of lithium ions,thereby improving the electrochemical properties of LiMn2O4,is a viable modification method.
Keywords: aqueous Li-ion battery  Na-dope  LiMn2O4
投稿时间:2017-02-24 修订日期:2017-06-01
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陶洪亮,米常焕,张迎霞.溶胶-凝胶法合成Li1-xNaxMn2O4及其作为水系锂离子电池正极材料的电化学性能[J].无机化学学报,2017,33(7):1147-1152.
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