Regulating the Deposition of Insoluble Sulfur Species for Room Temperature Sodium-Sulfur Batteries

作     者：WANG Chaozhi CUI Jingqin FANG Xiaoliang ZHENG Nanfeng WANG Chaozhi;CUI Jingqin;FANG Xiaoliang;ZHENG Nanfeng

作者机构：Pen-Tung Sah Institute of Micro-Nano Science and TechnologyState Key Laboratory for Physical Chemistry of Solid SurfacesCollaborative Innovation Center of Chemistry for Energy MaterialsNational&Local Joint Engineering Research Center for Preparation Technology of NanomaterialsCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005P.R.China Fujian Science&Technology Innovation Laboratory for Energy Materials of ChinaXiamen 361005P.R.China 

出 版 物：《Chemical Research in Chinese Universities》 (高等学校化学研究（英文版）)

年 卷 期：2022年第38卷第1期

页      面：128-135页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 

基　　金：This work was supported by the National Key R&D Program of China(Nos. 2020YFB1505802,2017YFA0207302) the National Natural Science Foundation of China(Nos.21731005,21721001) the Youth Innovation Fund of Xiamen City,China(No. 3502Z20206047) 

主　　题：Sodium sulfur battery Polysulfide Discharge/charge product High sulfur loading Stable cycling 

摘      要：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.