Microporous Cyclodextrin Film with Funnel-type Channel Polymerized on Electrospun Cellulose Acetate Membrane as Separators for Strong Trapping Polysulfides and Boosting Charging in Lithium-Sulfur Batteries  

作　　者：Shuanglin Wu Jiayi Shi Xiaolin Nie Yingmei Yao Feng Jiang Qufu Wei Fenglin Huang 

机构地区：[1]Key Laboratory of Eco-Textiles,Ministry of Education,Jiangnan University,Wuxi 214122,China [2]Department of Wood Science,University of British Columbia,Vancouver BC V6T 1Z4,Canada

出　　处：《Energy & Environmental Materials》2023年第2期90-99,共10页能源与环境材料（英文）

基　　金：the Jiangsu Provincial Key Research and Development Program(BE2017060);the China Postdoctoral Science Foundation(169483);the 111 Project(B17021)。

摘　　要：The“shuttle effect”of polysulfides hampers the commercialization of lithium-sulfur(Li-S)batteries.Here,a thin molecular sieve film was decorated on the surface of an electrospun cellulose acetate(CA)membrane derived from recycled cigarette filters,where the truncated cone structureβ-cyclodextrin(β-CD)was selected as the building block to physically block and chemically trap polysulfides while simultaneously dramatically speeding up ion transport.Furthermore,on theβ-CD free side of the separator facing the cathode,graphite carbon(C)was sputtered as an upper current collector,which barely increases the thickness.These benefits result in an initial discharge performance of 1378.24 mAh g^(−1) and long-term cycling stability of 863.78 mAh g^(−1) after 1000 cycles at 0.2 C for the battery with theβ-CD/CA/C separator,which is more than three times that of the PP separator after 500 cycles.Surprisingly,the funnel-type channel ofβ-CD generates a differential ionic fluid pressure on both sides,speeding up ion transport by up to 69%,and a 65.3%faster charging rate of 9484 mA g^(−1) was achieved.The“funnel effect”of a separator is regarded as a novel and high-efficiency solution for fast charging of Li-S and other lithium secondary batteries.

关 键 词：cellulose acetate fast charging magnetron deposition separator trapping polysulfides 

分 类 号：TQ317[化学工程—高聚物工业] TM912[电气工程—电力电子与电力传动]