Solid‑State Transformations of Active Materials in the Pores of Sulfurized‑Polyacrylonitrile Fiber Membranes via Nucleophilic Reactions for High‑Loading and Free‑Standing Lithium–Sulfur Battery Cathodes  

作　　者：Hao Liu Yun Zhang Yongbing Li Na Han Haihui Liu Xingxiang Zhang 

机构地区：[1]School of Material Science and Engineering,Tiangong University,Tianjin 300387,China [2]State Key Laboratory of Separation Membranes and Membrane Processes,Tianjin 300387,China [3]Municipal Key Laboratory of Advanced Fiber and Energy Storage,Tianjin 300387,China [4]Cangzhou Institute of Tiangong University,Cangzhou 061000,Hebei,China

出　　处：《Advanced Fiber Materials》2024年第3期772-785,共14页先进纤维材料（英文）

基　　金：supported by the New Materials Research Key Program of Tianjin(Grant No.18ZXJMTG00110).

摘　　要：Sulfurized polyacrylonitrile(SPAN)has emerged as an excellent cathode material for lithium–sulfur batteries(LiSBs),and it addresses the shuttle effect through a solid‒solid reaction.However,the actual sulfur loadings in SPAN often remain below 40 wt%.Due to the susceptibility of polysulfides-to-nucleophilic reactions with electrolytes,achieving physical encapsulation of elemental sulfur is a challenging task.In this study,a free-standing cathode material with a high sulfur/selenium(S/Se)loading of 55 wt%was fabricated by introducing SeS_(x) into the unique lotus root-like pores of porous SeS_(x)PAN nanofiber membranes by electrospinning and a two-step heat treatment.Insoluble compounds were formed due to nucleophilic interactions between lithium polyselenosulfides(LiSeSx)and the electrolyte,which potently blocked the existing lotus root-like pores and facilitated the creation of a thin cathode–electrolyte interphase on the fiber surface.This dual functionality of LiSeS_(x) safeguarded the active material embedded within the porous structure.The SeS_(15)PAN cathode exhibited remarkable cycling stability with almost no degradation after 200 cycles at 0.2 C,along with a high discharge capacity of 580 mAh/g.This approach presents a solution for addressing the insufficient sulfur content in SPAN.

关 键 词：Lithium–sulfur batteries Sulfurized polyacrylonitrile Cathode–electrolyte interphase High active material content Nucleophilic reactions 

分 类 号：TM912[电气工程—电力电子与电力传动]