溶胶凝胶法制备AZO包覆MgMn2O4及其电化学性能  

Improved Electrochemical Properties of MgMn2O4 Through AZO-Coating via Sol-gel Method

作　　者：季崇星 朱德澄 陈亦新 朱贤雨 黄继春 李德成 JI Chong-Xing;ZHU De-Cheng;CHEN Yi-Xin;ZHU Xian-Yu;HUANG Ji-Chung;LI De-Cheng(College of Energy,Soochow University,Suzhou,Jiangsu 215006,China)

机构地区：[1]苏州大学能源学院,苏州215006

出　　处：《无机化学学报》2020年第5期841-849,共9页Chinese Journal of Inorganic Chemistry

摘　　要：通过X射线衍射(XRD)、扫描电镜(SEM)和充放电测试等方法研究了铝掺杂氧化锌(AZO)包覆对其材料结构、形貌以及电化学性能的影响。研究结果表明,AZO包覆能够引起Mn的平均价态发生一定程度的改变,同时能够显著地减少SEI电阻,从而有效地改善材料的动力学特性;同时,AZO包覆能够有效地遏制材料长循环导致的粉化问题,保持电极导电网络的连续性,进而提高了材料的长期循环稳定性。其中,包覆量为5%(w/w)的MgMn2O4材料200次循环后其可逆比容量仍可达590.3 mAh·g^-1,远高于未改性的MgMn2O4材料(295.9 mAh·g^-1)及文献报道的结果。The effects of AZO coating on its structure,morphology and electrochemical properties of the MgMn2O4 were investigated by means of X-ray diffraction(XRD),scanning electron microscopy(SEM),charge and discharge tests and so on.It is shown that Al-doped ZnO(AZO)coating can effectively improve both the electronic conductivity and Li+diffusion,consequently improved its rate capability.Moreover,AZO coating can also remain the continuous conductive network of the electrode,therefore improve its cyclic stability.The reversible capacity of 5%(w/w)AZO-coated MgMn2O4 was 590.3 mAh·g^-1 after 200 cycles,much higher than that of the bare MgMn2O4(295.9 mAh·g^-1)and the reported value in literatures.

关 键 词：锂离子电池 负极材料 二元锰基尖晶石结构 溶胶凝胶法 AZO 

分 类 号：O646.541[理学—物理化学]