Construction of highly stable LiI/LiBr-based nanocomposite cathode via triple confinement mechanisms for lithium-halogen batteries  

作　　者：Mingzhen Ding Ruyu Shi Jie Qu Minman Tong 

机构地区：[1]College of Chemistry and Chemical Engineering,Key Laboratory of Light Energy Conversion Materials of Hunan Province College,Hunan Normal University,Changsha 410081,China [2]School of Chemistry and Materials Science,Jiangsu Normal University,Xuzhou 221116,China

出　　处：《Chinese Chemical Letters》2023年第11期350-354,共5页中国化学快报（英文版）

基　　金：the financial support by the Research Foundation of Hunan Education Committee of China(No.21B0067);Natural National Science Foundation of China(No.22278197).

摘　　要：Lithium-halogen batteries(LHBs),including lithium iodide(Li-I_(2))and lithium bromide(Li-Br_(2))batteries,are receiving more attention for offering high energy density and excellent kinetic performance.However,LHBs commercialization is seriously hindered by the high solubility of halides,causing lower capacity and poor cyclability.This research covers the fabrication of a highly stable cathode of amorphous carbon coated CMK-3/LiI/LiBr nanocomposite for metal lithium batteries.The nanopores and coated layer can physically trap the dissolution of active materials.The amorphous carbon generated from polyacrylonitrile carries abundant nitrogen heteroatoms for the stable anchorage of halogens and halides via strong chemical adsorption.In addition,iodine can act as a complexing agent with bromine to reduce solvation energy.Consequently,the as-prepared CMK-3/LiI/LiBr/carbon(CIBP)nanocomposite cathode demonstrates an ultra-high reversible capacity of 407.4 mAh/g at the current density of 1.0 C performing up to 300 stable cycles.

关 键 词：Lithium-halogen batteries Cathode LiI/LiBr High capacity Triple confinement 

分 类 号：TM9[电气工程—电力电子与电力传动]