基于微米级双峰尺寸分布的LiNi0.5Mn0.3Co0.2O2/LiFePO4粒子的协同电极

IF 3.3 4区材料科学 Q3 CHEMISTRY, PHYSICAL

Solid State Ionics Pub Date : 2025-08-21 DOI:10.1016/j.ssi.2025.117000

Oncu Akyildiz , Ezgi Yılmaz

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引用次数: 0

摘要

研究了以不同比例（10-40 wt%）混合LiNi0.5Mn0.3Co0.2O2微球和较小的LiFePO4微片制成的二元共混阴极的电化学行为。结果表明，基于原始电极比差容量加权平均的模型可以预测混合电极在0.1C下的放电曲线。然而，在高倍率（>1C）下，混合电极含有20wt %的LiFePO4（称为协同电极），与其他电极相比，显示出更高的放电容量和更好的容量保持能力（观察到100次循环）。利用循环伏安法和电化学阻抗谱对协同作用进行了合理化分析，表明协同电极的充放电反应更容易，体积电阻和电荷转移电阻都降低了，并且观察到更高的Li扩散系数。

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Synergy-electrode based on micron-sized LiNi0.5Mn0.3Co0.2O2/LiFePO4 particles with bimodal size distribution

We investigated the electrochemical behavior of binary blend cathodes made by mixing micro-spheres of LiNi_0.5Mn_0.3Co_0.2O₂ and smaller micro-platelets of LiFePO₄ in different proportions (10–40 wt%). Results show that the discharge profiles of the blended electrodes at 0.1C are predictable through a model based on the weighted averages of specific differential capacities of pristine electrodes. However, at high C-rates (>1C), the blended electrode contains 20 wt% LiFePO₄ (coined as the synergy-electrode) shows significantly higher discharge capacity and better capacity retention (observed up to the 100th cycle) than other electrodes. The synergy is rationalized using cyclic voltammetry and electrochemical impedance spectroscopy, indicating the facilitation of the charge-discharge reactions, reduction of both the bulk and the charge-transfer resistances, and higher Li diffusion coefficients observed for the synergy-electrode.

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来源期刊

Solid State Ionics 物理-物理：凝聚态物理

CiteScore

6.10

自引率

3.10%

发文量

152

审稿时长

58 days

期刊介绍： This interdisciplinary journal is devoted to the physics, chemistry and materials science of diffusion, mass transport, and reactivity of solids. The major part of each issue is devoted to articles on: (i) physics and chemistry of defects in solids; (ii) reactions in and on solids, e.g. intercalation, corrosion, oxidation, sintering; (iii) ion transport measurements, mechanisms and theory; (iv) solid state electrochemistry; (v) ionically-electronically mixed conducting solids. Related technological applications are also included, provided their characteristics are interpreted in terms of the basic solid state properties. Review papers and relevant symposium proceedings are welcome.