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高等学校化学研究 ›› 2022, Vol. 38 ›› Issue (1): 128-135.doi: 10.1007/s40242-021-1273-5

• Articles • 上一篇    下一篇

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

WANG Chaozhi1, CUI Jingqin1, FANG Xiaoliang1,2, ZHENG Nanfeng1,2   

  1. 1. 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;
    2. Fujian Science & Technology Innovation Laboratory for Energy Materials of China, Xiamen 361005, P. R. China
  • 收稿日期:2021-07-16 修回日期:2021-09-21 出版日期:2022-02-01 发布日期:2021-10-03
  • 通讯作者: FANG Xiaoliang, ZHENG Nanfeng E-mail:x.l.fang@xmu.edu.cn;nfzheng@xmu.edu.cn
  • 基金资助:
    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), and the Youth Innovation Fund of Xiamen City, China(No. 3502Z20206047).

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

WANG Chaozhi1, CUI Jingqin1, FANG Xiaoliang1,2, ZHENG Nanfeng1,2   

  1. 1. 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;
    2. Fujian Science & Technology Innovation Laboratory for Energy Materials of China, Xiamen 361005, P. R. China
  • Received:2021-07-16 Revised:2021-09-21 Online:2022-02-01 Published:2021-10-03
  • Contact: FANG Xiaoliang, ZHENG Nanfeng E-mail:x.l.fang@xmu.edu.cn;nfzheng@xmu.edu.cn
  • Supported by:
    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), and the Youth Innovation Fund of Xiamen City, China(No. 3502Z20206047).

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.

关键词: Sodium sulfur battery, Polysulfide, Discharge/charge product, High sulfur loading, Stable cycling

Abstract: 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.

Key words: Sodium sulfur battery, Polysulfide, Discharge/charge product, High sulfur loading, Stable cycling