Room temperature sodium-sulfur(RT-Na-S) batteries are regarded as promising candidates for next-generation high-energy-density batteries.However,in addition to the severe shuttle effect,the inhomogeneous deposition of the insoluble sulfur species generated during the discharge/charge processes also contributes to the rapid capacity fade of RT-Na-S batteries.In this work,the deposition behavior of the insoluble sulfur species in the traditional slurry-coated sulfur cathodes is investigated using microporous carbon spheres as model sulfur host materials.To achieve uniform deposition of insoluble sulfur species,a self-supporting sulfur cathode fabricated by assembling microporous carbon spheres is designed.With homogeneous sulfur distribution and favorable electron transport pathway,the self-supporting cathode delivers remarkably enhanced rate capability(509 mA·h/g at 2.5 C,1 C=1675 mA/g),cycling stability(718 mA·h/g after 480 cycles at 0.5 C) and areal capacity(4.98 mA·h/cm2 at 0.1 C),highlighting the great potential of manipulating insoluble sulfur species to fabricate high-performance RT-Na-S batteries.

WANG Chaozhi;CUI Jingqin;FANG Xiaoliang;ZHENG Nanfeng

Pen-Tung Sah Institute of Micro-Nano Science and Technology,State Key Laboratory for Physical Chemistry of Solid Surfaces,Collaborative Innovation Center of Chemistry for Energy Materials,National & Local Joint Engineering Research Center for Preparation Technology of Nanomaterials,College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,P.R.China;Fujian Science & Technology Innovation Laboratory for Energy Materials of China,Xiamen 361005,P.R.China

高等学校化学研究（英文版）

[1]WANG Chaozhi;CUI Jingqin;FANG Xiaoliang;ZHENG Nanfeng-.Regulating the Deposition of Insoluble Sulfur Species for Room Temperature Sodium-Sulfur Batteries)[J].高等学校化学研究（英文版）,2022(01):128-135

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