纳米颗粒组装三维Co3O4微米花材料制备及储锂性能研究  

Synthesis and lithium storage performance of three-dimensional Co3O4 micro-flowers assembled with nanoparticles

作　　者：王捷[1,2] 李圆 赵海雷 WANG Jie;LI Yuan;ZHAO Hailei(School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China;Beijing Key Laboratory of New Energy Materials and Technology,Beijing 100083,China)

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]北京市新能源材料与技术重点实验室,北京100083

出　　处：《化工学报》2020年第4期1844-1850,共7页CIESC Journal

基　　金：国家自然科学基金项目(U1637202,51634003);国家重点研发计划(2018YFB0905600);北京市教委-自然科学基金联合重点项目(KZ201910005003)。

摘　　要：通过软模板法(表面活性剂十六烷基三甲基溴化铵,CTAB)结合后续空气气氛热处理制备出纳米颗粒组装三维Co3O4微米花负极材料。研究中采用X射线衍射分析(XRD)、场发射扫描电子显微镜(FESEM)、循环伏安测试(CV)、恒流充放电测试以及交流阻抗测试(EIS)对合成样品进行表征分析。研究结果显示,Co3O4微米花材料独特的结构优势赋予其优良的电化学性能,在100 mA·g^-1电流密度下电极具备约920 mA·h·g^-1的循环可逆比容量;在500 mA·g^-1电流密度下循环200次后的循环可逆比容量为757 mA·h·g^-1,容量几乎无衰减。大电流循环性能测试显示,所制备电极即使在2 A·g^-1电流密度下依旧具有476 mA·h·g^-1的循环可逆比容量。简易、有效且低成本化的高性能微米花结构过渡金属氧化物负极材料制备工艺将大大加速转换型电极材料的实际有效应用。Nanoparticle assembled 3D Co3O4 micro-flower anode materials were prepared by soft template method(surfactant cetyltrimethylammonium bromide,CTAB)combined with subsequent air atmosphere heat treatment.The synthesized sample was characterized and analyzed by employing X-ray diffraction(XRD),field emission scanning electron microscopy(FESEM),cyclic voltammetry(CV),galvanostatic charge/discharge test and electrochemical impedance spectroscopy(EIS).The unique micro-flowers structure endows the prepared Co3O4 anode with excellent lithium storage properties.The reversible specific capacity of about 920 mA·h·g^-1 can be achieved at the current density of 100 mA·g^-1.The synthesized electrode displays almost no capacity decay over 200 cycles with the specific capacity of 757 mA·h·g^-1 at the current density of 500 mA·g^-1.The high current cycling performance test gives the specific capacity of 476 mA·h·g^-1 even at 2 A·g^-1.The simple,effective,and low-cost preparation process of high-performance micro-flower structure transition metal oxide anode materials in this paper will greatly accelerate the practical application of conversion-type electrode materials.

关 键 词：四氧化三钴 微米花结构 纳米粒子 负极 化学反应 电化学 锂离子电池 

分 类 号：TQ152[化学工程—电化学工业]