Fast capture and stabilization of Li‐ions via physicochemical dual effects for an ultra‐stable self‐supporting Li metal anode

作     者：Xuzi Zhang Yue Li Hao Zhang Ge Li Xuzi Zhang;Yue Li;Hao Zhang;Ge Li

作者机构：Department of Mechanical EngineeringUniversity of AlbertaEdmontonAlbertaCanada Department of Chemical and Materials EngineeringUniversity of AlbertaEdmontonAlbertaCanada 

出 版 物：《Carbon Energy》 (碳能源（英文）)

年 卷 期：2023年第5卷第9期

页      面：88-100页

核心收录：

学科分类：081704[工学-应用化学] 0808[工学-电气工程] 08[工学] 0817[工学-化学工程与技术] 

基　　金：Natural Sciences and Engineering Research Council of Canada,Grant/Award Numbers:Alliance‐Alberta Innovates Program/ALLRP‐561137‐20,Discovery Grant Program/RGPIN‐2020‐05184 University of Alberta Future Energy Systems 

主　　题：3D scaffold design Li affinity Li diffusivity Li metal anode long lifespan 

摘      要：Lithium(Li)metal is regarded as one of the most promising anode candidates for next-generation batteries due to its extremely high specific capacity and low redox ***,its application is still hindered by the uncontrolled growth of dendritic Li and huge volume fluctuation during *** address these issues,flexible and self-supporting three-dimensional(3D)interlaced Ndoped carbon nanofibers(NCNFs)coated with uniformly distributed 2D ultrathin NiCo_(2)S_(4)nanosheets(denoted CNCS)were designed to eliminate the intrinsic hotspots for Li *** dual effects of CNCS arise from limited surface Li diffusivity with a higher Li affinity,leading to uniform Li nucleation and less random accumulation of Li,as confirmed by ab initio molecular dynamics *** to the unique structure,exchange current density is reduced significantly and metallic Li is further contained within the interspace between the NCNF and NiCo_(2)S_(4)nanosheets,preventing the formation of dendritic *** symmetric cell with a Li/CNCS composite anode shows a long-running lifespan for almost 1200 h,with an exceptionally low and stable overpotential under 1mA cm^(-2)/1 mAh cm^(-2).A full cell coupled with a LiFePO4 cathode at a low N/P ratio of 2.45 shows typical voltage profiles but more significantly enhanced performance than that of a LiFePO4 cathode coupled with a bare Li anode.