储能科学与技术2025，Vol.14Issue(11)：4152-4161,10.DOI:10.19799/j.cnki.2095-4239.2025.0550
中空海胆状Ni-Co MOF/PP改性隔膜的制备及电化学性能研究
Fabrication and electrochemical performance of hollow sea-urchin-like Ni-Co MOF/PP modified separator
摘要
Abstract
This study employed a solvothermal method to fabricate hollow,sea-urchin-like nickel-cobalt bimetallic organic framework(Ni-Co MOF)materials.By adjusting the Ni/Co bimetallic ratio,the particle size and hollow structure of the material were effectively tuned.The optimized Ni/Co ratio significantly increased the specific surface area of the material,exposing more active metal sites and strengthening the chemical interaction with polysulfides,thereby effectively suppressing the shuttle effect in lithium-sulfur(Li-S)batteries.A series of Ni-Co MOF/PP modified separators were prepared via vacuum filtration,and their electrochemical performance was evaluated to examine the influence of the bimetallic ratio on battery performance.At a Ni/Co ratio of 3∶7,the modified separator exhibited optimal rate capability and cycling stability.The discharge specific capacities reached 1257.6,950.6,825.6,721.4,and 573.8 mAh/g at rates of 0.1,0.2,0.5,1,and 2 C,respectively.During long-term cycling at 1 C,the initial discharge specific capacity was 864.9 mAh/g,which remained at 537.4 mAh/g after 300 cycles,with a Coulombic efficiency of 95.2%and a low per-cycle capacity decay rate of 0.043%.Furthermore,this modified separator demonstrated the smallest polarization voltage difference,excellent reversibility,high electrochemical stability within the operating voltage range,high ionic conductivity,and a large Li+transference number.It also exhibited strong chemical binding interactions with polysulfides,effectively inhibiting their migration and diffusion as a modified separator coating.Overall,these results demonstrate that the material anchors active substances through strong interfacial adsorption,significantly mitigating the shuttle effect in Li-S batteries and providing superior electrochemical barrier functionality.关键词
镍钴双金属有机框架/改性隔膜/穿梭效应/锂硫电池Key words
bimetallic nickel-cobalt metal-organic framework/modified separator/shuttle effect/lithium-sulfur batteries分类
动力与电气工程引用本文复制引用
卫丹,刘悦琳,韩小娟,陈立新..中空海胆状Ni-Co MOF/PP改性隔膜的制备及电化学性能研究[J].储能科学与技术,2025,14(11):4152-4161,10.基金项目
陕西省自然科学基础研究计划青年项目(2025JC-YBQN-1276),陕西省教育厅一般专项科学研究计划项目(24JK0328). （2025JC-YBQN-1276）
