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工艺技术

铜元素掺杂改性蜂窝层状Na3Ni2SbO6 正极材料的电化学性能

  • 陈林 ,
  • 黄群 ,
  • 陈铖 ,
  • 冯伊铭 ,
  • 韦伟峰
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  • 中南大学 粉末冶金国家重点实验室,长沙 410083

收稿日期: 2022-12-16

  修回日期: 2023-01-14

  网络出版日期: 2023-03-23

基金资助

国家自然科学基金资助项目(51971250,11874199); 湖南省科技创新计划资助项目(2021RC1001); 中南大学粉末冶金国家重点实验室资助项目

Electrochemical properties of copper doped honeycomb-layered Na3Ni2SbO6 cathode materials

  • CHEN Lin ,
  • HUANG Qun ,
  • CHEN Cheng ,
  • FENG Yiming ,
  • WEI Weifeng
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  • State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China

Received date: 2022-12-16

  Revised date: 2023-01-14

  Online published: 2023-03-23

摘要

采用Cu部分替代Ni的方法对蜂窝层状Na3Ni2SbO6正极材料进行掺杂改性,得到Na3Ni2-xCuxSbO6 (x=0、0.2、0.4、0.8)正极材料,利用X射线衍射仪和扫描电镜研究材料的形貌与结构,并测试其电化学性能。结果表明,Cu掺杂可以有效改善Na3Ni2SbO6正极材料的循环稳定性,在0.1 C倍率下循环100圈后,Na3Ni2SbO6的放电比容量仅为39.5 mA∙h/g,而Na3Ni1.8Cu0.2SbO6材料的放电比容量达到72.3 mA∙h/g。通过理论计算和实验分析发现,Cu(Ⅱ)的引入可有效缩小Na3Ni2SbO6层状正极材料的带隙,降低Na+的扩散能垒,提高材料的电子电导和离子扩散速率,并且Cu掺杂可抑制Na3Ni2SbO6正极材料在循环过程中发生不利相变,从而提高材料的循环稳定性和电化学性能。

本文引用格式

陈林 , 黄群 , 陈铖 , 冯伊铭 , 韦伟峰 . 铜元素掺杂改性蜂窝层状Na3Ni2SbO6 正极材料的电化学性能[J]. 粉末冶金材料科学与工程, 2023 , 28(1) : 9 -11 . DOI: 10.19976/j.cnki.43-1448/TF.2022089

Abstract

Honeycomb layered Na3Ni2SbO6 cathode materials were doped with Cu instead of Ni to obtain Na3Ni2-xCuxSbO6 (x=0, 0.2, 0.4, 0.8) cathode materials. The morphology, structure and electrochemical properties of the materials were investigated by X-ray diffract to meter and scanning electron microscope. The results show that the cycling stability of Na3Ni2SbO6 cathode materials can be greatly enhanced by Cu substitution, i.e. the Cu-doped Na3Ni1.8Cu0.2SbO6 materials display a discharge capacity of 72.3 mA∙h/g after cycled for 100 cycles at 0.1C rate, while the discharge capacity of pristine Na3Ni2SbO6 cathode is only 39.5 mA∙h/g under the same situation. Through theoretical calculation and experimental analysis, it is found out that the introduction of Cu (Ⅱ) can effectively reduce the band gap of Na3Ni2SbO6 layered cathode materials and the diffusion energy barrier of Na+, and improve the electronic conductivity and ion diffusion performance of the cathode materials, and Cu substitution can also inhibit the adverse phase change of Na3Ni2SbO6 cathode materials during the cycle, thus improving the cycle stability and electrochemical performance of the layered cathode materials.

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