材料科学
阴极
铌
原子层沉积
锂(药物)
涂层
化学工程
氧化物
图层(电子)
纳米技术
冶金
化学
物理化学
工程类
医学
内分泌学
作者
Aakash Ahuja,Sri Harsha Akella,Abhinanda Sengupta,Pratima Kumari,Malachi Noked,Sagar Mitra
出处
期刊:Small
[Wiley]
日期:2025-08-05
卷期号:21 (38): e05389-e05389
被引量:1
标识
DOI:10.1002/smll.202505389
摘要
High energy cathodes with low environmental impact are critical for the development of next-generation lithium-ion batteries (LIBs). Lithium nickel manganese oxide (LNMO) cathode is a promising cathode candidate due to its high operating potential (≈4.7 V vs Li+/Li), energy density (≈650 Wh kg-1), thermal stability, and cost-effectiveness. However, it suffers from interfacial degradation and processing limitations. This work pioneers the implementation of niobium oxyfluoride as a multifunctional protective coating on LNMO for high-voltage LIBs applications. A conformal, ultrathin NbO2F layer (≈5 nm) is precisely engineered via atomic layer deposition, to improve cathode stability. The coating's dual-anion architecture (F- and O2-) and chemically inert Nb5+ state offers improved resistance to hydrofluoric acid-induced corrosion, suppressing transition-metal dissolution, and mitigating capacity degradation. In half-cell configuration, the niobium oxyfluoride coated LNMO (NbO2F@LNMO) versus Li/Li+ achieves >91% capacity retention after 500 cycles. At high temperature (60 °C), the cathode demonstrates 92.8% retention at 0.1 C and 550 Wh kg-1 energy density after 100 cycles. Full-cell comprising the NbO2F@LNMO cathode exhibits >94% capacity retention after 100 cycles. Additionally, the NbO2F@LNMO cathode exhibits a remarkable resilience under high-humidity environments, underscoring its robust long-term storage capabilities and processability. This approach provides a pathway toward practical LNMO cathodes for high-voltage, stable, and cost effective LIBs.
科研通智能强力驱动
Strongly Powered by AbleSci AI