Nickel-rich layered oxides with high energy density and acceptable cost are considered as one of the most ideal cathode materials for power batteries. However, its large-scale production and application still face the challenge in terms of rapid capacity fading and poor structural stability, which has prompted research into surface coating materials/technologies within both academic and industrial fields. In this work, A feasible and environmental friendly fabrication method of high-purity hexagonal phase tungsten oxide (h-WO3) nanoparticles as surface modification of LiNi0.8Co0.1Mn0.1O2(NCM) is proposed.The results indicate that NCM modified with h-WO3 has lower Li+/Ni2+ mixing rate, superior rate performance, and better cycling stability than the pristine NCM. Although tungsten oxide is widely used as surface modification due to its excellent physical and chemical properties, but its crystal type has not been considered, and there is little research on the theoretical explanation of h-WO3 modification.This work reveals the working mechanism of h-WO3 from the perspective of interface and crystal type, which can provide meaningful reference for obtaining nickel-rich layered oxides with excellent electrochemical properties.

中文翻译：

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自制高纯六方相氧化钨纳米粒子表面修饰提高LiNi0.8Co0.1Mn0.1O2电化学性能


富镍层状氧化物具有高能量密度和可接受的成本，被认为是最理想的动力电池正极材料之一。然而，其大规模生产和应用仍然面临着容量快速衰减和结构稳定性差等挑战，这促使学术界和工业界对表面涂层材料/技术进行研究。本工作提出了一种可行且环境友好的高纯六方相氧化钨（h-WO3）纳米颗粒的制备方法，用于LiNi0.8Co0.1Mn0.1O2（NCM）的表面改性。 -WO3比原始NCM具有更低的Li+/Ni2+混合率、优异的倍率性能和更好的循环稳定性。虽然氧化钨因其优异的物理化学性能被广泛用于表面改性，但其晶型尚未被考虑，对h-WO3改性的理论解释研究甚少。该工作揭示了h-WO3改性的工作机理。 -WO3从界面和晶型角度分析，可为获得具有优异电化学性能的富镍层状氧化物提供有意义的参考。