氢氟醚电解液在锂金属电池中的应用研究  

Application study of hydrofluoroether electrolyte on anode-free lithium metal cells

作　　者：陶锴 刘佩莹 王灿 Tao Kai;Liu Peiying;Wang Can(Wuhan Institute of Marine Electric Propulsion,Wuhan 430064,China)

机构地区：[1]武汉船用电力推进装置研究所,武汉430064

出　　处：《船电技术》2022年第2期43-46,51,共5页Marine Electric & Electronic Engineering

摘　　要：无负极锂金属电池存在容量损失快和循环寿命短的缺点。本文设计制备一种氢氟醚电解液,探究其在无负极锂金属电池中的应用。采用X射线衍射仪(XRD)和扫描电子显微镜(SEM)进行分析,结果表明该氢氟醚电解液对高面容量银碳基无负极锂金属电池的循环性能有着优良的改善作用。氢氟醚电解液减少了锂枝晶的产生,提高了沉积锂的致密性,在大于3 mAh/cm2的高面容量下,银碳基无负极锂金属电池在0.5C的倍率下50次循环后仍保持96.2%的平均库伦效率,展现了优良的循环性能和良好的倍率性能,1C倍率下容量保持率≥85%。The volume energy density of anode-free lithium metal battery is 60%higher than that of the traditional lithium-ion battery.However,the lithium metal batteries tend to experience rapid capacity loss and shorter cycle life.In this paper,the preparation of hydrofluoroether electrolyte for anode-free lithium metal cell is introduced.Then,the analyses using scanning electron microscope(SEM)and X-ray diffractometer(XRD)are presented.The results show that hydrofluoroether electrolyte has remarkable improvement on high area capacity silver-carbon anode-free cells,which reduces the generation of lithium dendrites and improves the compactness of the deposited lithium.At an areacapacity of more than 3.0 mAh/cm2,the silver-carbon anode-free cells maintain 96.2%average coulombic efficiency after 50 cycles at a rate of 0.5C,thereby ensuring excellent cycle performance.At the same time,the cells have a good capacity retention rate,the 1C rate discharge maintains an excellent capacity of no less than 85%.

关 键 词：氢氟醚电解液 无负极锂金属电池 循环性能 倍率性能 

分 类 号：TM912[电气工程—电力电子与电力传动]