4.7 Article

In situ implanting MnO nanoparticles into carbon nanorod-assembled microspheres enables performance-enhanced room-temperature Na-S batteries

Journal

INORGANIC CHEMISTRY FRONTIERS
Volume 9, Issue 21, Pages 5486-5494

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/d2qi01362b

Keywords

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Funding

  1. National Key Research and Development Program of China [2019YFB2203400]
  2. 111 Project [B20030]
  3. Australian Research Council [DP210102215]
  4. Australian Research Council (ARC) [FL170100101]

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The achievement of high-performance room-temperature sodium-sulfur batteries requires the fabrication of multifunctional sulfur electrodes through proper materials design strategies. In this study, a functionalized sulfur cathode was created by in situ implantation of polar MnO nanoparticles into carbon microspheres self-assembled by porous nanorods. The as-designed sulfur cathode exhibits excellent cycling performance and specific capacity.
The accomplishment of high-performance room-temperature sodium-sulfur (RT Na-S) batteries necessitates multifunctional sulfur electrodes via decent materials design strategies, since they are suffering from a series of critical challenges in S conversion chemistry. Herein, a functionalized S cathode is fabricated through in situ implanting polar MnO nanoparticles into carbon microspheres self-assembled by porous nanorods. The one-dimensional (1D) carbon nanorods can assist in fast electron transfer while nanochannels among the well-aligned nanorods act as pathways for Na ion diffusion. More significantly, the embedded ultrafine polar MnO nanoparticles function as good polysulfide adsorbents due to their strong chemical affinity and can promote conversion kinetics. As such, RT Na-S batteries with the as-designed S cathode achieve great cyclability of 234 mA h g(-1) over 1000 cycles at 2 A g(-1) and superior rate capability of 418 mA h g(-1) at 2 A g(-1).

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