A Ca-substituted air-stable layered oxide cathode material with facilitated phase transitions for high-performance Na-ion batteries

IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Rare Metals Pub Date : 2024-06-24 DOI:10.1007/s12598-024-02819-1

Shu-Bing Wei, Yong-Ju He, Yan Tang, Hong-Wei Fu, Jiang Zhou, Shu-Quan Liang, Xin-Xin Cao

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Abstract

Cost-efficient and high-performance cathodes play a crucial role in the advancement of grid-scale sodium-ion batteries (SIBs). As promising high-capacity cathode materials for SIBs, O₃-type Na-based layered transition metal oxides constantly experience inadequate air stability and complex phase transitions. Herein, a comprehensive investigation was conducted to explore the impact of Ca substitution on both the electrochemical performance and structural stability of O₃–Na_1−2xCa_xNi_0.25Fe_0.5Mn_0.25O₂ (x = 0, 0.02 and 0.05) that is proposed. With proper Ca content, O₃-type Na_0.96Ca_0.02Ni_0.25Fe_0.5Mn_0.25O₂ can deliver a reversible capacity of 122.1 mAh·g⁻¹ at 10 mA·g⁻¹, with capacity retention of 83.4% after 200 cycles at 50 mA·g⁻¹ and good rate capability. Its air sensitivity is investigated, and its potential as the Na host in full cells has been studied. In situ X-ray diffraction reveals the facilitated O₃–P₃–O₃ phase transitions of such cathode during the whole electrochemical reaction. Such a simple and effective strategy may reveal a new avenue for high-stable O₃-type cathodes and promote the practical applications of SIBs.

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一种具有促进相变功能的钙取代空气稳定层状氧化物阴极材料，适用于高性能钠离子电池

高性价比和高性能的阴极对电网级钠离子电池（SIB）的发展起着至关重要的作用。作为有前景的高容量钠离子电池阴极材料，O3 型 Na 基层状过渡金属氧化物一直存在空气稳定性不足和相变复杂的问题。在此，我们进行了一项综合研究，探讨了 Ca 取代对所提出的 O3-Na1-2xCaxNi0.25Fe0.5Mn0.25O2 （x = 0、0.02 和 0.05）的电化学性能和结构稳定性的影响。在钙含量适当的情况下，O3 型 Na0.96Ca0.02Ni0.25Fe0.5Mn0.25O2 在 10 mA-g-1 下可提供 122.1 mAh-g-1 的可逆容量，在 50 mA-g-1 下循环 200 次后容量保持率为 83.4%，并具有良好的速率能力。研究人员对其空气敏感性进行了调查，并对其在全电池中作为 Na 宿主的潜力进行了研究。原位 X 射线衍射显示，这种阴极在整个电化学反应过程中促进了 O3-P3-O3 相变。这种简单有效的策略可能会为高稳定的 O3 型阴极开辟一条新的途径，并促进 SIB 的实际应用。

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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.