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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Towards superior cyclability of LiNi0.8Co0.15Al0.05O2 cathode material for lithium ion batteries via yttrium modification
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Towards superior cyclability of LiNi0.8Co0.15Al0.05O2 cathode material for lithium ion batteries via yttrium modification

机译：通过钇改性，朝向LiNi0.8Co0.15A10.05O2的锂离子电池的阴极材料的卓越环绕性

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摘要

The surface instability and the structure degradation in Ni-rich cathode materials have been considered to the primary issues causing the severe capacity fading. In this study, a viable and effective approach to fabricate the yttrium modified LiNi0.8Co0.15Al0.05O2 (NCA) cathode materials with higher electrochemical performance by solid-state method is reported. The yttrium modified materials exhibit a notably enhanced electrochemical performance, which delivers a discharge capacity of 169.8 mAh g(-1) over 3.0-4.3 V at 1 C corresponding capacity retention of 95.3% after 200 cycles. Besides, the capacity of the modified materials at higher rate (8 C) increase to 156.9 mAh g(-1). With a careful and in-depth investigation, we found that the improved electrochemical performance can be attributed to the Y doping, which provides a powerful Y-O bond in the transition metal layers and effectively improves the structure stability. Additionally, the Ni2+ existing in the Li slabs to some extent exert a positive effect on suppressing the further cation migration and stabilizing the lithium slabs. Based on our work, we believe the modification strategy has the potential application in the cathode materials. (C) 2021 Published by Elsevier B.V.
机译：富镍阴极材料的表面不稳定性和结构退化被认为是导致严重容量衰减的主要问题。本研究为制备钇改性LiNi0提供了一种可行且有效的方法。8Co0。15Al0。本文报道了采用固相法制备的具有较高电化学性能的05O2（NCA）阴极材料。钇改性材料表现出显著增强的电化学性能，其在1 C下的放电容量为169.8 mAh g（-1），超过3.0-4.3 V，200次循环后的容量保持率为95.3%。此外，在较高速率（8C）下，改性材料的容量增加到156.9mAh g（-1）。通过仔细和深入的研究，我们发现Y掺杂可以改善电化学性能，它在过渡金属层中提供了强大的Y-O键，并有效地提高了结构稳定性。此外，锂板中存在的Ni2+在一定程度上对抑制进一步的阳离子迁移和稳定锂板起到了积极作用。基于我们的工作，我们相信这种改性策略在阴极材料中有潜在的应用。（c）2021由爱思唯尔B.V出版。

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