Evaluating the optimal cathode material for energy storage devices: a comparative study of LiFePO₄ and LiMnPO₄ using electric impedance

IF 2.6 4区化学 Q3 CHEMISTRY, PHYSICAL

Ionics Pub Date : 2025-05-10 DOI:10.1007/s11581-025-06382-2

Gharam A. Alharshan, Hosam M. Gomaa, M. A. M. Uosif, E. R. Shaaban

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引用次数: 0

Abstract

This study investigates the crystalline structure, phase compositions, and electrochemical properties of LiFePO₄, LiFe₀.₅Mn₀.₅PO₄, and LiMnPO₄ cathode materials using thermogravimetric analysis (TGA), X-ray diffraction (XRD) analysis, and impedance spectroscopy. XRD analysis revealed distinct peaks corresponding to each material, confirming their successful synthesis and high crystallinity. The incorporation of manganese resulted in shifts in peak positions, indicating changes in lattice parameters and unit cell volume. Impedance spectroscopy, conducted over a wide frequency range, showed that LiFePO₄ exhibited the lowest impedance, suggesting superior charge transport and lower resistance, while LiMnPO₄ showed the highest impedance, indicating greater resistance and potential challenges. LiFe₀.₅Mn₀.₅PO₄ displayed intermediate impedance characteristics. The Cole–Cole diagrams highlighted these differences, with LiFePO₄ demonstrating the smallest semicircular arc, indicating lower charge transfer resistance, while LiMnPO₄ exhibited the largest arc. The findings suggest that LiFePO₄ is the most efficient material for energy storage applications, while LiMnPO₄ requires optimization to improve its performance.

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评价储能器件最佳正极材料：用电阻抗法比较LiFePO₄和LiMnPO₄

本研究探讨了LiFePO₄，LiFe 0 .₅Mn 0的晶体结构、相组成和电化学性能。₅PO₄和LiMnPO₄正极材料采用热重分析（TGA）， x射线衍射（XRD）分析和阻抗谱。XRD分析显示每种材料都有不同的峰，证实了它们的成功合成和高结晶度。锰的掺入导致峰位置的变化，表明晶格参数和单元胞体积的变化。在较宽的频率范围内进行阻抗谱分析，LiFePO₄的阻抗最低，表明其具有较好的电荷传输和较低的电阻，而LiMnPO₄的阻抗最高，表明其具有较大的电阻和潜在的挑战。生活₀₅Mn₀。₅PO₄显示中间阻抗特性。Cole-Cole图突出了这些差异，LiFePO₄的半圆弧最小，表明电荷转移电阻较低，而LiMnPO₄的半圆弧最大。研究结果表明，LiFePO₄是储能应用中最有效的材料，而LiMnPO₄需要优化以提高其性能。

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来源期刊

Ionics 化学-电化学

CiteScore

5.30

自引率

7.10%

发文量

427

审稿时长

2.2 months

期刊介绍： Ionics is publishing original results in the fields of science and technology of ionic motion. This includes theoretical, experimental and practical work on electrolytes, electrode, ionic/electronic interfaces, ionic transport aspects of corrosion, galvanic cells, e.g. for thermodynamic and kinetic studies, batteries, fuel cells, sensors and electrochromics. Fast solid ionic conductors are presently providing new opportunities in view of several advantages, in addition to conventional liquid electrolytes.