应用化学 ›› 2024, Vol. 41 ›› Issue (4): 568-576.DOI: 10.19894/j.issn.1000-0518.230291

• 研究论文 • 上一篇    下一篇

镁掺杂高镍三元正极材料LiNi0.90Co0.05Mn0.05O2的合成与性能

陈胜2, 胡祖飞2, 曹洪美3, 赵振华1, 张宇栋1()   

  1. 1.江苏科技大学材料科学与工程学院,镇江 212100
    2.湖南久日新材料有限公司,怀化 418200
    3.江苏科技大学能源与动力学院,镇江 212100
  • 收稿日期:2023-09-23 接受日期:2024-02-02 出版日期:2024-04-01 发布日期:2024-04-28
  • 通讯作者: 张宇栋
  • 基金资助:
    湖南省科学技术协会“小荷”科技人才托举工程项目(2023TJ-X92)

Synthesis and Properties of Mg‑Doped Ni‑Rich Ternary Cathode Material LiNi0.90Co0.05Mn0.05O2

Sheng CHEN2, Zu-Fei HU2, Hong-Mei CAO3, Zhen-Hua ZHAO1, Yu-Dong ZHANG1()   

  1. 1.School of Materials Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang 212100,China
    2.Hunan Jiuri New Materials Co. ,Ltd. ,Huaihua 418200,China
    3.School of Energy and Power,Jiangsu University of Science and Technology,Zhenjiang 212100,China
  • Received:2023-09-23 Accepted:2024-02-02 Published:2024-04-01 Online:2024-04-28
  • Contact: Yu-Dong ZHANG
  • About author:yudongzhang@just.edu.cn
  • Supported by:
    Hunan Science and Technology Association “Xiaohe” Science and Technology Talent Lifting Project(2023TJ?X92)

摘要:

采用高温固相法合成了一系列不同含量Mg掺杂的LiNi0.90Co0.05Mn0.05O2正极材料,并通过X射线衍射、扫描电子显微镜、透射电子显微镜和X射线光电子能谱等表征手段对其物相结构、颗粒形貌及电化学性能进行了研究。 结果表明,掺杂Mg元素虽然会降低材料的可逆容量,但是可扩大材料晶胞体积,抑制不可逆相变,改善电极与电解液的界面稳定性,可有效提升材料的循环稳定性。 其中,3%摩尔分数掺杂量的LiNi0.90Co0.05Mn0.05O2正极材料结构稳定,容量损失较少,综合性能表现较好,在0.1 C、2.8~4.3 V电压范围内,首周充放电比容量达到了197.3 mA?h/g,100周的循环保持率达到了93.6%,且5 C下放电比容量为161.1 mA?h/g。

关键词: 锂离子电池, 正极材料, 元素掺杂, 电化学性能

Abstract:

A series of Mg-doped LiNi0.90Co0.05Mn0.05O2 cathode materials are synthesized via a high-temperature solid-phase method. The phase structure, particle morphology, and electrochemical properties of the doped LiNi0.90Co0.05Mn0.05O2 cathode materials are investigated using the X-ray diffraction, scanning electron microscope, transmission electron microscope, and X-ray photoelectron spectroscopy. The test results demonstrate that while Mg doping reduces the reversible capacity of the cathode, it expands the lattice volume, inhibits irreversible phase transitions, improves electrode-electrolyte interface stability, and effectively enhances cycle stability. Among the samples, the LiNi0.90Co0.05Mn0.05O2 cathode material with 3% Mg molar doping amount exhibits a stable structure with less capacity loss and superior overall performance. The discharge specific capacity of the sample at the first cycle reaches 197.3 mA?h/g at 0.1 C in the voltage range of 2.8~4.3 V. Furthermore, it achieves a remarkable cycle retention rate of 93.6% after 100 cycles and maintains a high discharge specific capacity at 5 C (161.1 mA?h/g).

Key words: Lithium-ion batteries, Cathode materials, Element doping, Electrochemical performance

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