文献类型：期刊文献

英文题名：An ion-released MgI2-doped separator inducing a LiI-containing solid electrolyte interphase for dendrite-free Li metal anodes

作者：Yi, Shan[1];Su, Zhe[1];Zhang, Wanyu[1];Chen, Hongli[1];Zhang, Yayun[1];Niu, Bo[1];Long, Donghui[1,2]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Key Lab Specially Funct Mat & Related Technol, Minist Educ, Shanghai 200237, Peoples R China

年份：2022

卷号：75

起止页码：83

外文期刊名：JOURNAL OF ENERGY CHEMISTRY

收录：;EI(收录号：20223512649730);WOS:【SCI-EXPANDED(收录号:WOS:000862791400010)】；

基金：This work was supported by the National Natural Science Foundation of China (22078100, 22008073, and 52102098) .

语种：英文

外文关键词：Lithium metal anode; LiI-containing layer; Dendrite-free anode; Electrospun nanofiber separator

摘要：Lithium metal batteries are among the strong contenders to satisfy the ever-increasing needs of energy storage systems, which however suffer from poor composition of the solid electrolyte interphase (SEI) layer and uncontrolled Li dendrites formation. In this regard, we report on the design of an ion -released MgI2-doped polyacrylonitrile (PAN) based nanofiber (MPANF) separator, which can lead to con-ducive SEI layer and dendrite-free Li anode. The combination of the lithophilic MgI2 nanoparticles with polarized PAN matrix comprehensively functions as a high-compatible interpenetrating network to homogenize ionic transportation and confront dendrite growth. The released I ions introduce the high -ion-conductivity LiI into SEI layer, which could induce the formation of favorable and protective interface layer in the early stage, as embodied in the enrichment of advantageous components such as LiNxOy, Li2O, LiF, and Li3N. Profited from the high-affinity MPANF separator, the Li||Li symmetric cell achieves an ultra -low voltage hysteresis of 46 mV with an extended lifespan of 580 h. And a prolonged lifetime of 590 cycles with an enhanced specific capacity of 140.1 mAh g-1 and the Coulombic efficiency of 96.2% at 1 C can be obtained in full cells. This work may offer a facile and high-affinity alternative to traditional polymeric separators for high-performance and dendrite-free Li metal batteries.(c) 2022 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.