The notorious polysulfides shuttling and slow redox reaction kinetics largely limit the Li–S battery commercial application as an effective energy storage system. In this report, Mn/N catalysts were co-doped on a high specific surface area reduced graphene oxide (RGO) scaffold by a simple formamide media-assisted method to develop the sulfur holding material for Li–S battery. The N-doped RGO with conductive layer structure not only facilitates the ion and electron transfer, but also provides superb reservoir space for sulfur volume expansion and intermediate polysulfides. Moreover, the introduction of Mn metal catalysts both paly the roles of chemical trappers and electrocatalysts to chemically anchor the polysulfides and accelerate the redox kinetics. It is a promising holding material to improve the reutilization of the polysulfides and suppression of the shuttle effect in lithium-sulfur batteries. As a result, the high initial discharge capacity for the Mn-NG modified Li–S battery is about 1124.7 mAh g at 0.2 C, which can still reach to 914.3 mAh g after 100 cycles, with a retention rate up to 81%. We believe that our method offers a significant approach to prepare multi-functional sulfur hosts for high performance Li–S batteries.

中文翻译：

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Mn和N掺杂的RGO作为硫主体加速Li-S电池的电子转移和氧化还原反应

臭名昭著的多硫化物穿梭和缓慢的氧化还原反应动力学在很大程度上限制了锂硫电池作为有效储能系统的商业应用。在本报告中，通过简单的甲酰胺介质辅助方法将Mn/N催化剂共掺杂在高比表面积还原氧化石墨烯（RGO）支架上，开发了用于Li-S电池的硫保持材料。具有导电层结构的N掺杂RGO不仅有利于离子和电子传输，而且为硫体积膨胀和中间多硫化物提供了极好的储存空间。此外，锰金属催化剂的引入既发挥了化学捕集剂和电催化剂的作用，以化学方式锚定多硫化物并加速氧化还原动力学。它是一种有前途的保持材料，可提高多硫化物的再利用率并抑制锂硫电池中的穿梭效应。结果表明，Mn-NG改性Li-S电池在0.2 C下的初始放电容量约为1124.7 mAh g，100次循环后仍可达到914.3 mAh g，容量保持率高达81%。我们相信，我们的方法为制备高性能锂硫电池的多功能硫主体提供了一种重要的方法。