Heterostructures have attracted extensive attention because of their unique structure and multiple functions, showing potential for various energy storage and conversion techniques. Here, inspired by the potential advantages of heterostructures, we design an insulating MoO₃/conducting MoO₂ heterostructure as a host for lithium octasulfide (Li₂S₈) for lithium–sulfur batteries. Different from other heterostructures with a sharp interface, the transition state of MoO_x is proved to have a large atomic ratio (∼18%). Benefiting from the good conductivity of MoO₂ and the strong polarity of MoO_x to adsorb LiPS, the initial specific capacity of the MoO₃/MoO₂-CP-Li₂S₈ cathode is 898.4 mA h g⁻¹ and drops to 828.1 mA h g⁻¹ after 500 cycles at 0.5C, showing a 92.2% retention of the initial capacity. Meanwhile, it can deliver an initial specific capacity of 580.5 mA h g⁻¹ at 2.5C with a capacity retention of 82.8% after 850 cycles. This work shows that the heterostructures of 2D materials are promising as a Li₂S₈ host because of their multiple functions and may provide new strategies to design electrochemical electrodes.

中文翻译：

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MoO3 / MoO2-CP自支撑异质结构用于修饰锂硫电池

异质结构因其独特的结构和多种功能而受到广泛关注，显示出各种能量存储和转换技术的潜力。在这里，受异质结构潜在优势的启发，我们设计了绝缘MoO ₃ /导电MoO ₂异质结构作为锂硫电池_八硫化锂（Li ₂ S ₈）的主体。与其他具有尖锐界面的异质结构不同，MoO _x的过渡态被证明具有大的原子比（〜18％）。得益于MoO ₂的良好电导率和MoO _x吸附LiPS的强极性，MoO ₃的初始比容量/ MoO ₂ -CP-Li ₂ S ₈阴极为898.4 mA hg ^-1，在0.5C下经过500次循环后降至828.1 mA hg ^-1，显示初始容量保留92.2％。同时，它可以在2.5C下提供580.5 mA hg ^-1的初始比容量，经过850个循环后，容量保持率为82.8％。这项工作表明，二维材料的异质结构有望成为Li ₂ S ₈主体，因为它们具有多种功能，并可能为设计电化学电极提供新的策略。