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油酸作表面活性剂和碳源合成超细Li2MnSiO4@C正极材料及电化学表征

作者:时间:2018-05-04点击数:

PDF全文下载:  201803011.pdf

 

文章编号: 16726987201803006805 DOI 10.16351/j.16726987.2018.03.011

 

朱格格, 刘静, 彭红瑞*

(青岛科技大学 材料科学与工程学院,山东 青岛 266042

 

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Li2MnSiO4@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10~20 nm。当油酸加入量与LiOH的物质的量的比为21时,得到的Li2MnSiO4@C纳米材料(LMS2)电化学性能最好;在005 C的倍率下,材料的首次放电容量达到313 mA·h·g-1,经过50个循环后,放电比容量仍保持为1547 mA·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。

关键词: Li2MnSiO4 油酸; 正极材料; 锂离子电池

中图分类号: O 646.21文献标志码: A

引用格式:朱格格, 刘静, 彭红瑞. 油酸作表面活性剂和碳源合成超细Li2MnSiO4@C正极材料及电化学表征\[J\]. 青岛科技大学学报(自然科学版), 2018 393): 6872.

ZHU Gege LIU Jing PENG Hongrui. Synthesis and electrochemical characterization of ultrafine Li2MnSiO4@C nanocomposite for cathode of Liion batteries using oleic acid as both surfactant and carbon source\[J\]. Journal of Qingdao University of Science and TechnologyNatural Science Edition), 2018, 39(3) 6872.

Synthesis and Electrochemical Characterization of Ultrafine

Li2MnSiO4@C Nanocomposite for Cathode of Liion Batteries Using

Oleic Acid as Both Surfactant and Carbon Source

 

ZHU Gege LIU Jing PENG Hongrui

 (College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China)

 

Abstract: 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 1020 nm. When the molar ratio of oleic acid and LiOH reaches 21, the obtained sample (LMS2) shows the best electrochemical performance. At a rate of 005 C, its first discharge capacity is 313 mA·h·g-1, and it remains 1547 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.

Key words: Li2MnSiO4 oleic acid cathode material Liion battery

 

收稿日期:  20170203

基金项目: 国家自然科学基金项目(51672146.

作者简介: 朱格格(1989—),女,硕士研究生.*通信联系人.

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