摘要
锂-二氧化碳(Li-CO_(2))电池中锂金属负极的枝晶生长及其引起的体积膨胀将导致电池循环稳定性和安全性等问题。本工作通过在商用玻璃纤维(GF)隔膜的负极侧喷涂Li_(1.5)Al_(0.5)Ti_(1.5)(PO_(4))_(3)(LATP)颗粒掺杂的MXene,开发出了一种LATP@MXene修饰的涂层隔膜。该复合材料具有较高的混合导电性促进了锂离子/电子的均匀转移。其三维网络型导电框架的大比表面积有效降低局部电流密度有利于诱导锂的均匀沉积。结果表明,基于该复合隔膜的Li-CO_(2)电池实现了优异的电化学性能,包括金属锂的低成核沉积电位(29.5 mV)、高放电比容量(38 827 mAh·g^(-1))和稳定的循环寿命(85次)。
The dendritic growth and unrestricted volume expansion of lithium metal anode in lithium-carbon dioxide(Li-CO_(2))batteries have resulted in cycle stability and safety issues.Herein,a gradient modified coating separator by LATP@MXene composite nanomaterials was developed by spraying Li_(1.5)Al_(0.5)Ti_(1.5)(PO_(4))_(3)(LATP)doped MXene on one side of commercial glass fiber(GF)separator.The composite material has high mixed conductivity,which promotes the uniform transfer of lithium ions/electrons.The large specific surface area of its threedimensional network-type conductive framework can effectively induce the uniform deposition of lithium by reducing the local current density.The results show that the Li-CO_(2) batteries based on the composite separator have achieved excellent electrochemical performance,these include low nucleation potential(3.9 mV)of metal lithium,high discharge specific capacity(38827 mAh·g^(-1))and stable cycle life(85 cycles)for lithium matal.
作者
张庆威
赵慧敏
郭自洋
ZHANG Qingwei;ZHAO Huimin;GUO Ziyang(College of Chemistry and Molecular Engineering,Qingdao University of Science and Technolog,Qingdao 266042,China)
出处
《青岛科技大学学报(自然科学版)》
2025年第6期22-28,共7页
Journal of Qingdao University of Science and Technology(Natural Science Edition)
基金
中国博士后科学基金项目(2019M652499)。
