Laser irradiation constructing all-in-one defective graphenepolyimide separator for effective restraint of lithium dendrites and shuttle effect
作者机构：State Key Laboratory of Heavy Oil ProcessingAdvanced Chemical Engineering and Energy Materials Research CenterCollege of New EnergyChina University of Petroleum(East China)Qingdao 266580China College of PhysicsUniversity-Industry Joint Center for Ocean Observation and Broadband CommunicationState Key Laboratory of Bio-Fibers and Eco TextilesQingdao UniversityQingdao 266071China
出 版 物：《Nano Research》 (纳米研究（英文版）)
年 卷 期：2023年第16卷第10期
页 面：12304-12314页
核心收录：
学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学]
基 金：the National Natural Science Foundation of China(Nos.22005341 and 22138013) the Shandong Provincial Natural Science Foundation(Nos.ZR2020QB128 and ZR2020ZD08) the Taishan Scholar Project(No.tsqnz20221121) the Major Scientific and Technological Innovation Project of Shandong Province(No.2020CXGC010402) the Independent Innovation Research Project of China University of Petroleum(No.22CX06026A)
主 题：lithium-sulfur batteries separators laser-induced graphene intrinsic carbon defects shuttle effect Li dendrites
摘 要：The commercialization of lithium-sulfur(Li-S)batteries faces several bottlenecks,and the major two of which are the shuttle effect of polysulfides and the wild growth of Li dendrites,responsible for fast capacity decay and severe safety *** an essential component of Li-S batteries,the structure and properties of the separators are closely related to the above problems,and the exploration of multifunctional separators is highly ***,an integrated separator composited of defective graphene and polyimide(DG-PI)was innovatively fabricated by electrospinning combined with the laser-induced carbonization *** all-in-one compact architecture with well-interconnected channels shows superior mechanical and thermal stability and *** importantly,the PI nanofibers containing N–/O–functional groups can induce the uniform deposition of lithium on the anode surface,while the DG framework with abundant pentagonal/heptagonal rings and vacancies can strongly trap polysulfides and accelerate polysulfide transformation on the cathode *** strong chemical interaction between the insulative PI layer and the conductive DG layer modulates the surface charge distribution of each other,leading to more prominent contributions to restraining lithium dendrites and shuttle ***,the Li-S batteries based on the integrated DG-PI separators afford an excellent performance in protecting lithium anode(stable cycles of 200 h at 5 mA·cm^(−2))and good cycling stability with a low capacity decay of 0.05%per cycle after 700 cycles at 1 *** work offers a new design concept of multifunctional Li-S battery separators and broadens the application scope of laser micro-nano fabrication technology.
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