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无机材料学报

• 研究论文 •    

Al掺杂P2型Na0.8Ni0.33Mn0.67-xAlxO2钠离子电池正极材料的制备与电化学性能

闫共芹1,2, 王晨1, 蓝春波1,2, 洪雨昕1, 叶维超1, 付向辉1   

  1. 1.广西科技大学 机械与汽车工程学院,柳州 545616;
    2.广西汽车零部件与整车技术重点实验室,柳州 545616
  • 收稿日期:2024-12-02 修回日期:2025-02-03
  • 作者简介:闫共芹(1982-), 男, 博士, 副教授. E-mail: ygq@gxust.edu.cn
  • 基金资助:
    广西壮族自治区自然科学基金（2020GXNSFAA159024）; 广西高校中青年教师科研基础能力提升项目（2022KY0350）; 柳州市科技计划项目（2024AA0203A001）; 广西汽车零部件与整车技术重点实验室自主课题（2023GKLACVTKF03）

Al Doping P2-type Na0.8Ni0.33Mn0.67-xAlxO2: Synthesis and Electrochemical Properties as Cathode for Sodium-ion Batteries

YAN Gongqin1,2, WANG Chen1, LAN Chunbo1,2, HONG Yuxin1, YE Weichao1, FU Xianghui1   

  1. 1. School of Mechanical and Automotive Engineering, Guangxi University of Science and Technology, Liuzhou 545616, China;
    2. Guangxi Key Laboratory of Automobile Components and Vehicle Technology, Liuzhou 545616, China
  • Received:2024-12-02 Revised:2025-02-03
  • About author:YAN Gongqin (1982-), male, PhD, associate professor. E-mail: ygq@gxust.edu.cn
  • Supported by:
    Guangxi Natural Science Foundation (2020GXNSFAA159024); Young and Middle-aged Teacher's Research Basis Ability in Colleges of Guangxi (2024AA0203A001); Science & Technology Planning Projects of Liuzhou (2023GKLACVTKF03); Opening Foundation of Guangxi Key Laboratory of Automobile Components and Vehicle Technology (2023GKLACVTKF03)

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摘要： 钠离子电池具有低廉的成本和良好的安全性,有望替代锂离子电池,在储能领域极具发展前景。P2型Ni/Mn基氧化物具有高理论容量和宽工作电压的优点,然而,高压下P2-O2相变和Jahn-Teller畸变严重影响了循环可逆性和结构稳定性。针对上述问题,本研究通过高温固相法制备了不同Al掺杂量的P2型Na0.8Ni0.33Mn0.67-xAlxO2并将其用作钠离子电池正极材料,表征了形貌、成分、元素价态和结构特征。研究发现,Al掺杂增强了金属-氧键(M-O键),增大了Na层距离,有助于Na+扩散和结构稳定。电化学性能测试结果表明,Al掺杂可以抑制高压相变,触发Mn的电化学活性,降低电荷转移电阻,从而增强材料的电化学性能。其中,Na0.8Ni0.33Mn0.62Al0.05O2正极表现出最佳的循环性能,在2~4.2 V范围内0.1C (1C = 200 mA·g-1)条件下200次循环后容量保持率为87.3%,并具有良好的倍率性能,在2~4.2 V范围内2C下容量达到100.9 mAh‧g-1。

关键词: 钠离子电池, Al掺杂, P2型正极, 镍锰基氧化物, 电化学性能

Abstract: Sodium-ion batteries have emerged as a significant alternative to lithium-ion batteries, offering a cost-effective and safe solution with promising potential in energy storage. Among these, P2-type Ni/Mn based oxides possess the advantages of high theoretical capacity and wide operating voltage. However, the P2-O2 phase transition and Jahn-Teller aberration under high pressure significantly impact the cycling reversibility and structural stability. To address the issues above, in this study P2-type Na0.8Ni0.33Mn0.67-xAlxO2 with different contents of Al doping using a high-temperature solid-phase method was prepared, and employed as cathode material for sodium-ion batteries. The morphology, composition, elemental valence, and structural features of the material were characterized. It was observed that the introduction of Al doping resulted in strengthening of the metal-oxygen bonds (M-O bonds) and an expansion of the Na layer distance, thereby facilitating Na+ diffusion and enhancing structural stability. The electrochemical properties demonstrate that Al doping can impede the high-voltage phase transition, stimulate the electrochemical activity of Mn, and diminish the charge transfer resistance, thereby enhancing the electrochemical properties of the materials. Among the examined materials, the Na0.8Ni0.33Mn0.62Al0.05O2 cathode displayed the optimal cycling performance with a capacity retention of approximately 87.3% after 200 cycles at 0.1C (1C = 200 mA·g-1) in the range of 2-4.2 V, and superior rate performance with a capacity of 100.9 mAh‧g-1 at 2C in the range of 2-4.2 V.

Key words: sodium-ion battery, Al doping, P2-type cathode, nickel-manganese oxide, electrochemical properties

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