Mg-Ti共掺杂LiNi0.5Mn1.5O4对提高材料结构稳定和电化学性能的协同效应研究

黄振德; 彭迪

doi:10.7513/j.issn.1004-7638.2025.06.012

Mg-Ti共掺杂LiNi_0.5Mn_1.5O₄对提高材料结构稳定和电化学性能的协同效应研究

doi: 10.7513/j.issn.1004-7638.2025.06.012

黄振德,
彭迪^,

广西工业职业技术学院，广西南宁 530001

基金项目: 广西自然科学基金项目（2018GXXNSFAA294042）；广西高校中青年教师科研基础能力提升项目（2021KY1280）。

详细信息

作者简介:
黄振德，1976年出生，男，广西南宁人，硕士，副教授，长期从事高能锂离子电池正极材料研发，E-mail：260013585@qq.com

通讯作者:
彭迪，1982年出生，女，广西河池人，本科，工程师，主要研究方向为新能源材料应用与工程项目管理，E-mail：2459811233@qq.com

中图分类号: TM912
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- 被引次数: 0
出版历程
- 收稿日期: 2025-04-15
- 录用日期: 2025-06-19
- 修回日期: 2025-06-14
- 网络出版日期: 2025-12-31
- 刊出日期: 2025-12-31

Synergistic effect of Mg-Ti co-doped LiNi_0.5Mn_1.5O₄ on improving material structural stability and electrochemical performance

HUANG Zhende,
PENG Di^,

Guangxi Vocational and Technical Institute of Industry, Nanning 530001, Guangxi, China

摘要

摘要: 采用自聚合法合成Mg-Ti掺杂LNMO不同样品LiNi_0.5-xMg_xTi_yMn_{1.5- y}O₄（x= 0, 0.02; y= 0, 0.03）尖晶石正极材料。通过XRD、FTIR、SEM和EDS材料表征以及电化学性能测试，深入研究分析了Mg-Ti共掺杂LiNi_0.5Mn_1.5O₄样品的晶体结构特征、微观形貌和掺杂元素分布等对充放电过程倍率性能和循环容量稳定性的影响。结果表明：Mg-Ti共掺杂可适当提高Mn³⁺含量，强化Fd3m空间群无序化程度，以及晶体粒径变小和分布更均匀，表现出更优异倍率性能和循环容量稳定性。在1C和10C不同倍率下，LiNi_0.48Mg_0.02Ti_0.03Mn_1.47O₄材料放电容量分别为133 mAh/g与102 mAh/g，常温1C循环200次后放电容量仍为123 mAh/g，容量保持率92.5%。晶体结构和形貌对材料电化学影响结果表明，Mg-Ti共掺杂具有协同效应，对LiNi_0.5Mn_1.5O₄的倍率性能和循环稳定性有着显著影响。
- Mg-Ti共掺杂 /
- 协同效应 /
- LiNi_0.5Mn_1.5O₄ /
- 充放电倍率性能
Abstract: Mg-Ti co-doped LNMO samples LiNi_0.5-xMg_xTi_yMn_1.5-yO₄ (x= 0, 0.02; y= 0, 0.03) were synthesized using self-aggregation method, as spinel cathod materil. Through XRD, FTIR, SEM, and EDS material characterization, as well as electrochemical performance testing, the correlation between the crystal morphology, particle size, distribution uniformity, charge discharge rate performance, and cycling capacity stability of Mg-Ti co doped LiNi_0.5Mn_1.5O₄ samples were systematically analyzed and studied. The results show that Mg-Ti co-doping can appropriately increase the Mn³⁺content, enhance the disorder degree of Fd3m space group, reduce the crystal particle size and make the distribution more uniform, which help to improve the rate performance and cycling capacity stability. At 1C and 10C rates, the discharge capacities of LiNi_0.48Mg_0.02Ti_0.03Mn_1.47O₄ material were 133 mAh/g and 102 mAh/g, respectively. After 200 cycles of 1C at room temperature, the discharge capacity remained at 123 mAh/g, with a capacity retention rate of 92.5%. The results of the influence of crystal structure and morphology on the electrochemistry of materials indicate that Mg-Ti co-doped has a synergistic effect, which significantly affects the rate performance and cycling stability of LiNi_0.5Mn_1.5O₄.
- Mg-Ti co-doped /
- synergistic effect /
- LiNi_0.5Mn_1.5O₄ /
- charge discharge rate performance

HTML全文

图 1 Mg-Ti共掺杂LNMO不同样品XRD谱图

(a)XRD总谱图；(b)局部放大

Figure 1. XRD spectra for different samples of Mg-Ti co-doped LNMO materials

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图 2 Mg-Ti共掺杂LNMO不同样品的FTIR谱图

Figure 2. FTIR spectra for different samples of Mg-Ti co-doped LNMO materials

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图 3 Mg-Ti共掺杂LNMO不同样品的SEM图

Figure 3. SEM images of different samples of Mg-Ti co-doped LNMO materials

(a)P-LNMO; (b) M-LNMO; (c) T-LNMO; (d) MT-LNMO

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图 4 LiNi_0.48Mg_0.02Ti_0.03Mn_1.47O₄样品Ni、Mn、Mg和Ti元素EDS图谱

Figure 4. EDS mapping images of Ni, Mn, Mg and Ti elements in the LiNi_0.48Mg_0.02Ti_0.03Mn_1.47O₄ sample

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图 5 Mg-Ti共掺杂LNMO不同样品的首次充放电容量

Figure 5. Initial charge-discharge curves for different samples of Mg-Ti co-doped LNMO materials

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图 6 Mg-Ti共掺杂LNMO不同样品的倍率性能

Figure 6. Rate performance for different samples of Mg-Ti codoped LNMO materials

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图 7 Mg-Ti共掺杂LNMO不同样品的充放电循环性能

Figure 7. Cycling performance for different samples of Mg-Ti co-doped LNMO materials

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图 8 Mg-Ti共掺杂LNMO不同样品的循环伏安测试

Figure 8. Cyclic voltammograms for different samples of Mg-Ti co-doped LNMO materials

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图 9 Mg-Ti共掺杂LNMO不同样品的电化学阻抗谱

Figure 9. Electrochemical impedance spectroscopy for different samples of Mg-Ti co-doped LNMO materials

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