Exploring a phase-compatible surface engineering for enhancing the structural stability in Li-rich layered oxides

IF 11.2 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Science & Technology Pub Date : 2025-07-13 DOI:10.1016/j.jmst.2025.06.020

Errui Wang, Jing Yue, Hailiang Chu, Longde Duan, Jing Tang, Zhenzhen Hui, Xiangju Ye, Xu Zhang, Haijun Yu

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引用次数: 0

Abstract

Li-rich layered oxides (LLOs) show tremendous potential as cathode materials for next-generation Li-ion batteries (LIBs) due to their high energy density and cost-effectiveness. However, several challenges, including lattice oxygen release, interface side reactions, and structural transitions, lead to rapid performance degradation, which limits their widespread application. To address these issues, a phase-compatible spinel Li_1.25Cr_0.25Ti_1.5O₄ (LCTO) coating layer on LLOs, as well as Cr3+ and Ti4+ surface co-doping, is successfully constructed. Based on the synergetic effect of the coating and co-doping, we intend to effectively enhance the structure stability and electrochemical performance upon cycling. Consequently, the optimized LCTO-LLOs-1 exhibits a capacity retention of 85.6% and a voltage decay of 0.309 Mv cycle⁻¹ after 500 cycles at 1 C. In addition, an excellent rate capacity of 163.5 mAh g⁻¹ is delivered at 5 C. This study provides a promising solution for enhancing the performance and stability of LLOs, paving the way for their broader application in LIBs.

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探索提高富锂层状氧化物结构稳定性的相相容表面工程

富锂层状氧化物（LLOs）由于其高能量密度和成本效益，在下一代锂离子电池（LIBs）正极材料中具有巨大的潜力。然而，包括晶格氧释放、界面副反应和结构转变在内的一些挑战导致性能迅速下降，这限制了它们的广泛应用。为了解决这些问题，在LLOs表面成功构建了相相容的尖晶石Li1.25Cr0.25Ti1.5O4 （LCTO）涂层，并在Cr3+和Ti4+表面共掺杂。基于涂层和共掺杂的协同效应，我们打算有效地提高循环后的结构稳定性和电化学性能。因此，优化后的lto -LLOs-1在1℃下循环500次后，容量保持率为85.6%，电压衰减为0.309 Mv cycle -1，此外，在5℃下可提供163.5 mAh g -1的优异倍率容量。该研究为提高LLOs的性能和稳定性提供了一个有希望的解决方案，为其在lib中的广泛应用铺平了道路。

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

Journal of Materials Science & Technology 工程技术-材料科学：综合

CiteScore

20.00

自引率

11.00%

发文量

995

审稿时长

13 days

期刊介绍： Journal of Materials Science & Technology strives to promote global collaboration in the field of materials science and technology. It primarily publishes original research papers, invited review articles, letters, research notes, and summaries of scientific achievements. The journal covers a wide range of materials science and technology topics, including metallic materials, inorganic nonmetallic materials, and composite materials.