Abstract Lithium-sulfur batteries (LSB) became recently one of the most promising next-generation energy storage devices due to their high energy density and low cost. However, its large-scale commercial application is hindered by severe shuttle-effect and insulation of the sulfur. Herein, in order to overcome these disadvantages, mulberry-like three-dimensional hollow reduced graphene oxide microspheres modified with cobalt oxide nanoparticles (CoO/MGra) were designed as sulfur host. CoO/MGra possesses not only excellent electrical conductivity but also provides sufficiently large space for the storage of sulfur. The three-dimensional hollow structures can also significantly alleviate the volume expansion of sulfur during the cycling process. At the same time, the shuttle effect is suppressed due to the efficient chemical adsorption towards lithium polysulfide by CoO nanoparticles. As a result, excellent cycle stability (1010 mAh g−1 after 150 cycles at 0.2C) and outstanding rate performance (745 mAh g−1 at 3C) are achieved when using the S-CoO/MGra cathode.

中文翻译：

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用 CoO 纳米粒子装饰的桑树状空心 rGO 微球作为锂硫电池的有效多硫化物锚定

摘要 锂硫电池（LSB）由于其高能量密度和低成本成为近年来最有前途的下一代储能装置之一。然而，硫的严重穿梭效应和绝缘性阻碍了其大规模商业应用。在此，为了克服这些缺点，设计了用氧化钴纳米粒子（CoO/MGra）修饰的桑椹状三维中空还原氧化石墨烯微球作为硫主体。CoO/MGra 不仅具有优异的导电性，而且还为硫的储存提供了足够大的空间。三维中空结构还可以显着缓解循环过程中硫的体积膨胀。同时，由于 CoO 纳米颗粒对多硫化锂的有效化学吸附，穿梭效应被抑制。因此，当使用 S-CoO/MGra 正极时，实现了优异的循环稳定性（0.2C 下 150 次循环后 1010 mAh g-1）和出色的倍率性能（3C 下 745 mAh g-1）。