电化学2023，Vol.29Issue(3)：41-55,15.DOI:10.13208/j.electrochem.2217002
CoNi基双金属-有机骨架衍生碳复合材料多功能改性锂硫电池隔膜
CoNi-based Bimetal-organic Framework Derived Carbon Composites Multifunctionally Modified Separators for Lithium-Sulfur Batteries
摘要
Abstract
The commercial application of lithium-sulfur batteries(LSB)is still limited by the irreversible capacity fading caused by the shuttle of lithium polysulfides(LIPS).To address this issue,a bimetal(nickel,cobalt)-organic framework(MOF)derived carbon,(Ni,Co)/C,was prepared to modify the separator.The multifunctionally modified separator effectively captures LIPS,ensuring the stability and reversibility of sulfur fixation,while providing catalytic activity and improving ionic conductivity.The cobalt metal has a larger coordination number,more pore structure distri-bution,larger specific surface area,more surface C=O,and smaller particle size to achieve a large and rapid chemical sulfur fixation.The high conductivity provided by nickel,and the catalytic activity and the ability to block LIPS shuttling enabled the reversibility of sulfur inhibition.The synergistic effect of cobalt-nickel bimetals significantly improves the cycling stability and rate capability of LSB.At a current density of 1 C,the capacity of the(Ni,Co)/C modified separator battery could reach 1035.6 mAh·g-1 in the first cycle,the capacity remained at 662.2 mAh·g-1 after 500 cycles,and the capacity retention rate was 63.9％.关键词
锂硫电池/隔膜改性/双金属有机框架/穿梭效应Key words
Lithium-sulfur battery/Modified separator/Bimetal-organic framework derived carbon composites/Shuttle effect引用本文复制引用
王妍洁,张义永,李雪,程宏宇,侯冀岳,杨文豪,黄荣威,倪志聪,朱子翼,王颖,韦克毅..CoNi基双金属-有机骨架衍生碳复合材料多功能改性锂硫电池隔膜[J].电化学,2023,29(3):41-55,15.基金项目
This work was supported by Yunnan Fundamental Research Projects(Grant NO.202001AU070079,202101BE070001-018,202101AT070214,202101AW070006),and Yunnan ZhongYan Industry Co.,Ltd.Science and Technology Project(2020GY03). （Grant NO.202001AU070079,202101BE070001-018,202101AT070214,202101AW070006）
