油酸作表面活性剂和碳源合成超细Li_2MnSiO_4@C正极材料及电化学表征  

Synthesis and Electrochemical Characterization of Ultrafine Li_2MnSiO_4@C Nano-composite for Cathode of Li-ion Batteries Using Oleic Acid as Both Surfactant and Carbon Source

作　　者：朱格格 刘静 彭红瑞[1] ZHU Gege;LIU Jing;PENG Hongrui(College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 2GG042, Chin)

机构地区：[1]青岛科技大学材料科学与工程学院,山东青岛266042

出　　处：《青岛科技大学学报（自然科学版）》2018年第3期68-72,共5页Journal of Qingdao University of Science and Technology:Natural Science Edition

基　　金：国家自然科学基金项目(51672146)

摘　　要：以油酸同时作为表面活性剂和碳源,通过简单的方法制备了不同碳含量的超细Li_2MnSiO_4@C纳米颗粒。扫描电镜(SEM)和透射电镜(TEM)照片显示样品颗粒非常均匀且粒径非常小,只有10~20nm。当油酸加入量与LiOH的物质的量的比为2∶1时,得到的Li_2MnSiO_4@C纳米材料(LMS2)电化学性能最好;在0.05C的倍率下,材料的首次放电容量达到313mA·h·g^(-1),经过50个循环后,放电比容量仍保持为154.7mA·h·g^(-1)。材料优异的电化学性能可归因于其具有极小的粒径、疏松多孔的结构和较高的电导率。Herein,we employ a simple method to prepare the ultrafine Li2MnSiO4@C nanoparticles with different carbon content,where oleic acid is used as both surfactant and carbon source.SEM and TEM images show that the particle size of samples is distributed homogeneously in the range of 10—20 nm.When the molar ratio of oleic acid and LiOH reaches 2∶1,the obtained sample（LMS2）shows the best electrochemical performance.At a rate of 0.05 C,its first discharge capacity is 313 mA·h·g^-1,and it remains 154.7 mA·h·g^-1 even after 50 cycles.These superior electrochemical properties could be attributed to the ultrafine particle size,the porous structure and the enhanced electronic conductivity.

关 键 词：LI2MNSIO4 油酸 正极材料 锂离子电池 

分 类 号：O646.21[理学—物理化学]