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Morphology Control of Al Oxide Coating to Suppress Interfacial Degradation in Ultra-high Nickel Cathode Materials
Electrochimica Acta ( IF 5.5 ) Pub Date : 2025-01-21 , DOI: 10.1016/j.electacta.2025.145727
Minseong Kim, Jiyun Park, Taewan Kim, Byeonggu Kang, Joowon Im, Mingi Jeon, Sujong Chae, Minseong Ko

Although ultra-high nickel layered cathode materials (LiNixCoyMn1−x−yO2, x ≥ 0.9, NCM90) offer advantages of high energy density and cost-effectiveness, the deterioration of cycle characteristics remains a challenge due to electrolyte decomposition reactions and irreversible phase transitions. In this study, we explored the morphology-controlled Al oxide coatings to mitigate cycle degradation in NCM90. The coating layer was applied in an island-shaped morphology, forming a relatively thick layer compared to fully passivated film-shaped coatings. This morphology effectively suppresses increasing impedance, reduces electrolyte decomposition reactions, and limits the dissolution of transition metals during the electrochemical cycling. It also provides high stability across both normal (3.0-4.3 V) and high (3.0-4.5 V) voltage ranges due to the maintenance of coating integrity against HF attacks. This study underscores the importance of a strategically engineered coating layer, demonstrating that an island-shaped morphology can significantly enhance the cycle performance of NCM90.

中文翻译:


氧化铝涂层的形貌控制抑制超高镍正极材料中的界面降解



尽管超高镍层状正极材料 (LiNi x Co y Mn 1−x−y O 2 , x ≥ 0.9, NCM90) 具有高能量密度和成本效益等优点,但由于电解质分解反应和不可逆相变,循环特性的恶化仍然是一个挑战。在这项研究中,我们探索了形态控制的氧化铝涂层以减轻 NCM90 的循环降解。涂层以岛状形态涂覆,与完全钝化的薄膜状涂层相比,形成了相对较厚的涂层。这种形态有效地抑制了阻抗的增加,减少了电解质分解反应,并限制了电化学循环过程中过渡金属的溶解。由于保持涂层完整性以抵御 HF 攻击,它还在正常 (3.0-4.3 V) 和高电压 (3.0-4.5 V) 范围内提供高稳定性。这项研究强调了战略性工程涂层的重要性,表明岛状形态可以显着提高 NCM90 的循环性能。
更新日期:2025-01-21
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