Evaluation of high-entropy (Cr, Mn, Fe, Co, Ni)-oxide nanofibers and nanoparticles as passive fillers for solid composite electrolytes

IF 5.5 3区材料科学 Q1 ELECTROCHEMISTRY

Electrochimica Acta Pub Date : 2024-11-28 DOI:10.1016/j.electacta.2024.145425

Asia Patriarchi, Claudia Triolo, Luca Minnetti, Miguel Ángel Muñoz-Márquez, Francesco Nobili, Saveria Santangelo

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Abstract

Solid-state electrolytes (SSEs) could represent the key to solve safety issues of lithium-ion batteries (LIBs). Among them, those obtained by homogenously dispersing inorganic nanofillers into a polymer matrix combine advantages of all SSE typologies. In this work, high-entropy (Cr,Mn,Fe,Co,Ni) oxide (HEO) with different morphology (nanoparticles or nanofibers) are evaluated as passive fillers for the preparation of composite polyethylene oxide (PEO)-based SSEs. By varying their preparation conditions (calcination at 400 or 800°C for 0.5 or 2 h, followed by rapid cooling) different size and crystallization degree of the oxide grains are obtained. The results of the electrochemical testing of the PEO/HEO composites evidence the crucial role of the filler microstructure and morphology. The best results in terms of electrolyte resistance (22.5 Ω), electrochemical stability window (4.7 V), Li⁺ transference number (0.37) and ionic conductivity (3.0⋅10⁻⁴ S cm⁻¹ at 65°C) are obtained by using well crystallized HEO nanofibers with highly defective surface. The suitability of the most promising composite for practical applications is validated by successfully using it in full cell with commercial high-voltage cathode materials.

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评估作为固体复合电解质无源填料的高熵 (铬、锰、铁、钴、镍) 氧化物纳米纤维和纳米粒子

固态电解质（SSE）是解决锂离子电池（LIB）安全问题的关键。其中，通过在聚合物基质中均匀分散无机纳米填料而获得的固态电解质兼具所有固态电解质类型的优点。本研究评估了不同形态（纳米颗粒或纳米纤维）的高熵（Cr,Mn,Fe,Co,Ni）氧化物（HEO）作为被动填料用于制备基于聚氧化乙烯（PEO）的复合 SSE。通过改变其制备条件（在 400 或 800°C 煅烧 0.5 或 2 小时，然后快速冷却），可获得不同尺寸和结晶程度的氧化物晶粒。PEO/HEO 复合材料的电化学测试结果证明了填料微观结构和形态的关键作用。在电解质电阻（22.5 Ω）、电化学稳定性窗口（4.7 V）、Li+转移数（0.37）和离子电导率（3.0⋅10-4 S cm-1，65°C）方面，使用结晶良好且表面高度缺陷的 HEO 纳米纤维获得了最佳结果。通过在全电池中成功使用商用高压阴极材料，验证了最有前途的复合材料在实际应用中的适用性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Electrochimica Acta 工程技术-电化学

CiteScore

11.30

自引率

6.10%

发文量

1634

审稿时长

41 days

期刊介绍： Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.