Lithium–sulfur (Li–S) batteries, as the next generation of energy storage systems, are currently limited by insufficient capture ability and sluggish catalytic reaction kinetics, thus leading to serve the shuttle effect of lithium polysulfides (LiPSs). Realizing the accelerated conversion of polysulfides in the cathode host of Li–S batteries is an effective way to improve its coulombic efficiency. The essence of fast conversion relies on enhanced oxidation reaction kinetics by virtue of the metal catalyst, but the generation of various intermediates exacerbate the complexity of the system and perplex the perfect operation of batteries relying on only one catalyst. In this work, the xMoO₂:yCo₂Mo₃O₈ heterostructures were designed, in which controlling the content of cobalt could balance the capture capability towards LiPSs by MoO₂ and catalytic ability of liquid–solid conversion by Co₂Mo₃O₈ catalytic sites. Therefore, utilizing synergy effect of MoO₂–Co₂Mo₃O₈ heterostructure enhances capture and catalytic ability toward polysulfides in Li–S batteries. As a result, the 9MoO₂:2Co₂Mo₃O₈-based cathode delivers excellent reversibility of 880 mA h g⁻¹ after 100 cycles at 0.2C and 509 mA h g⁻¹ after 1000 cycles at 1C with 0.056% capacity decay each cycle. This work provides a new method for synthesizing heterostructures by doping metals. Moreover, it promotes the understanding of balancing and promoting the capture capacity and catalytic conversion ability toward LiPSs.

中文翻译：

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通过设计用于锂硫电池的 MoO2-Co2Mo3O8 异质结构来平衡对多硫化物的捕获和催化能力

锂硫（Li-S）电池作为下一代储能系统，目前受到捕获能力不足和催化反应动力学缓慢的限制，从而导致多硫化锂（LiPSs）的穿梭效应。实现锂硫电池正极主体中多硫化物的加速转化是提高其库仑效率的有效途径。快速转化的本质在于借助金属催化剂增强氧化反应动力学，但各种中间体的产生加剧了系统的复杂性，并困扰着仅依靠一种催化剂的电池的完美运行。在这项工作中，x MoO ₂ : y Co ₂ Mo ₃ O设计了_8种异质结构，其中控制钴的含量可以平衡MoO ₂对LiPSs的捕获能力和Co ₂ Mo ₃ O ₈催化位点的液固转化催化能力。因此，利用MoO ₂ –Co ₂ Mo ₃ O ₈异质结构的协同效应增强了Li-S电池对多硫化物的捕获和催化能力。因此，基于 9MoO ₂ :2Co ₂ Mo ₃ O ₈的阴极在 0.2C 和 509 mA hg 下循环 100 次后可提供 880 mA hg ^{-1 的}优异可逆性^-1在 1C 下 1000 次循环后，每次循环容量衰减 0.056%。这项工作为通过掺杂金属合成异质结构提供了一种新方法。此外，它促进了对平衡和促进对 LiPS 的捕获能力和催化转化能力的理解。