无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ
研究与开发

Li2MnO3复合LiNi0.8Co0.1Mn0.1O2材料制备及电化学性能研究

  • 熊凡 ,
  • 王同振 ,
  • 高强 ,
  • 程凤如 ,
  • 罗惜情
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  • 合肥工业大学化学与化工学院,安徽合肥 230009
熊凡(1990— ),男,硕士研究生,主要从事锂离子电池材料的研究;E-mail:18326030975@163.com。

收稿日期: 2019-07-21

  网络出版日期: 2020-02-26

Study on Synthesis and electrochemical performance of Li2MnO3-LiNi0.8Co0.1Mn0.1O2 composite cathodes materials

  • Fan Xiong ,
  • Tongzhen Wang ,
  • Qiang Gao ,
  • Fengru Cheng ,
  • Xiqing Luo
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  • School of Chemistry and Chemical Engineering,Hefei University of Technology,Hefei 230009,China

Received date: 2019-07-21

  Online published: 2020-02-26

摘要

通过采用共沉淀法制备了Ni0.8Co0.1Mn0.1(OH)2前驱体,利用固相法研磨混合碳酸锰和碳酸锂,在氧气氛围下煅烧制备得到了Li2MnO3-LiNi0.8Co0.1Mn0.1O2复合材料,通过利用X射线衍射(XRD)、场发射扫描电镜(FESEM)和透射电镜(TEM)表征了所制备材料的结构、成分和形貌等。通过恒流充放电、交流阻抗等方法对材料的电化学性能进行测试。结果表明,与未改性材料进行对比,3%(质量分数)Li2MnO3复合改性材料0.5C下首次放电容量为183 mA·h/g,经过120次充放电循环,容量保持率为93.9%;同时,在高倍率下复合改性材料放电容量也得到提高。因此,采用固相法煅烧复合Li2MnO3-LiNi0.8Co0.1Mn0.1O2材料,可以制备出电化学性能优异的正极材料。

本文引用格式

熊凡 , 王同振 , 高强 , 程凤如 , 罗惜情 . Li2MnO3复合LiNi0.8Co0.1Mn0.1O2材料制备及电化学性能研究[J]. 无机盐工业, 2020 , 52(1) : 68 -72 . DOI: 10.11962/1006-4990.2019-0108

Abstract

A co-precipitation route was utilized to synthesize the precursor of Ni0.8Co0.1Mn0.1(OH)2,which was mixed with MnCO3 and Li2CO3 afterwards. After calcination in the oxygen atmosphere,Li2MnO3-LiNi0.8Co0.1Mn0.1O2 composite material was obtained.The structure,composition and morphology of the prepared materials were characterized by X-ray diffraction(XRD),field emission scanning electron microscopy(FESEM) and transmission electron microscopy(TEM),respectively.The electrochemical performance of the material was tested by galvanostatic charge/discharge measurements and electrochemical impedance spectroscopy.Results showed that the 3%(mass fraction) Li2MnO3 composite material exhibit higher initial discharge capability(183 mA·h/g at 0.5C),more stable cycle performance(with capacity retention of 93.9% after 120 cycles)and better rate performance,compared with unmodified cathode.Thus,this strategy is extremely promising for the preparation of LiNi0.8Co0.1Mn0.1O2 electrode materials with enhanced electrochemical performances.

参考文献

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