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

• 作者: WANG Chaozhi CUI Jingqin FANG Xiaoliang ZHENG Nanfeng
• 来源期刊: 高等学校化学研究（英文版）
• 年，卷（期）: 2022,（1）
• 所属期刊栏目: Articles
• 页码范围: 128-135
• 页数: 8页
• 语种: 英文

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.