Unlocking oxygen vacancy-rich high-entropy oxides in upgrading composite solid electrolyte

IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Rare Metals Pub Date : 2024-09-04 DOI:10.1007/s12598-024-02961-w

Jun Cheng, Nai-Xuan Ci, Hong-Qiang Zhang, Zhen Zeng, Xuan Zhou, Yuan-Yuan Li, Hua-Jun Qiu, Wei Zhai, Dan-Dan Gao, Li-Jie Ci, De-Ping Li

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Abstract

Recently, high-entropy materials are attracting enormous attention in battery applications, encompassing both electrode materials and solid electrolytes, due to the pliability and diversification in material composition and electronic structure. Theoretically, the rapid ion transport and the abundance of surface defects in high-entropy materials suggest a potential for enhancing the performance of composite solid-state electrolytes (CPEs). Herein, using a high-entropy oxide (HEO) filler to assess its potential contributions to CPEs is proposed. The distinctive structural distortions in HEO significantly improve the ionic conductivity (5 × 10⁻⁴ S·cm⁻¹ at 60 °C) and Li-ion transference number (0.57) of CPEs. Furthermore, the enhanced Li-ion transport capability extends the critical current density from 0.6 to 1.5 mA·cm⁻² in Li/Li symmetric cells. In addition, all-solid-state batteries incorporating the HEO-modified CPEs exhibit superior rate performance and cycling stability. The work will enrich the application of HEOs in CPEs and provide fundamental understanding.

Graphical abstract

Abstract Image

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释放升级复合固体电解质中的富氧空位高熵氧化物

近来，高熵材料因其材料成分和电子结构的柔韧性和多样性，在电池应用领域受到极大关注，包括电极材料和固体电解质。从理论上讲，高熵材料的快速离子传输和丰富的表面缺陷为提高复合固态电解质（CPE）的性能提供了可能。本文提出使用高熵氧化物（HEO）填料来评估其对 CPE 的潜在贡献。HEO 中独特的结构畸变显著提高了 CPE 的离子电导率（5 × 10-4 S-cm-1，60 °C）和锂离子传输数（0.57）。此外，增强的锂离子传输能力还将锂/锂对称电池的临界电流密度从 0.6 mA-cm-2 提高到 1.5 mA-cm-2。此外，采用 HEO 改性氯化聚乙烯的全固态电池表现出卓越的速率性能和循环稳定性。这项工作将丰富 HEO 在 CPE 中的应用，并提供基本的理解。

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来源期刊

Rare Metals 工程技术-材料科学：综合

CiteScore

12.10

自引率

12.50%

发文量

2919

审稿时长

2.7 months

期刊介绍： Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.