弹性聚合物固态电解质界面膜保护金属锂负极  

Elastic Polymer Solid Electrolyte Interphase Protects Lithium Metal Anode

作　　者：卢微 王子豪 赵安顺 于明希 杜米 赵雪 张文静 刘梅[3] 冯明[1,3] LU Wei;ANG Zihao;ZHAO Anshun;YU Mingxi;DU Mi;ZHAO Xue;ZHANG Wenjing;LIU Mei;FENG Ming(Key Laboratory of Functional Materials Physics and Chemistry Ministry of Education,Jilin Normal University,Changchun 130103,China;College of Information Technology,Jilin Engineering Research Center of Optoelectronic Materials and Devices,Jilin Normal University,Siping 136000,Jilin,China;College of Physics,Jilin Normal University,Siping 136000,Jilin,China)

机构地区：[1]吉林师范大学,功能材料物理与化学教育部重点实验室,长春130103 [2]吉林师范大学信息技术学院,吉林四平136000 [3]吉林师范大学物理学院,吉林四平136000

出　　处：《硅酸盐学报》2024年第7期2187-2196,共10页Journal of The Chinese Ceramic Society

基　　金：吉林省科学技术厅项目(YDZJ202201ZYTS304)。

摘　　要：固态电解质界面膜(SEI)的性质直接影响着锂金属电池中金属锂负极的稳定性。本文通过原位紫外光聚合方法构筑了弹性聚合物人工固态电解质界面膜(EP-SEI)保护的金属锂负极。这种EP-SEI具有优异的均匀性、稳定性和弹性,在电池循环中促进锂离子均匀沉积。这些特性可以抑制锂枝晶的生成,缓冲金属锂负极在循环时的体积变化,有效保护金属锂负极。这种EP-SEI保护的金属锂负极组装的LFP||Li电池和NCM811||Li电池在0.5 C倍率下的最高容量分别可达到164.1 m A·h·g^(-1)和187.1 m A·h·g^(-1),并稳定循环500圈。Introduction Lithium metal batteries(LMBs)are regarded as candidates for next-generation batteries due to their low electrochemical potential(i.e.,–3.040 V vs.standard hydrogen electrode)and high theoretical specific capacity(i.e.,3860 mA·h·g^(-1)).Lithium(Li)metal anode is susceptible to side reactions with organic electrolytes,leading to the uneven formation of the solid electrolyte interphase(SEI).The non-uniformity and fragility of the SEI can aggravate the growth of Li dendrites and excessive electrolyte consumption,ultimately resulting in a rapid attenuation of capacity and safety risks.These issues severely hinder the commercialization of LMBs.The development of an artificial SEI is crucial for protecting Li metal anode,suppressing Li dendrite growth,and accommodating volume changes during cycling.This advancement is essential for improving the stability and cycling life of LMBs.In this paper,we synthesized an artificial elastic polymer SEI(EP–SEI)constructed on the surface of Li metal anode by an in–situ UV–curing method.The main composition of EP–SEI was poly(ethyleneglycol)diacrylate–co–vinylene carbonate(PEGDA–CO–VC)cross-linking polymer.Methods For the synthesis of an artificial elastic polymer SEI(EP–SEI)constructed on the surface of Li metal anode by an in–situ UV–curing method,polyethylene glycol diacrylate(PEGDA)and vinylene carbonate(VC)were mixed in a mass ratio of 4:1(i.e.,80 mg and 20 mg)under stirring.Afterwards,2 m L of dimethoxyethane(DME)was added for dissolution.Subsequently,the mixture was dripped onto Li metal foils,followed by polymerization under a mercury lamp after the addition of2-hydroxy-2-methylpropiophenone(HMPP).This method utilized UV light to rapidly excite the unsaturated bonds of polymer monomers,thereby shortening the polymerization reaction time and enhancing the preparation efficiency of the artificial SEI.This method was simple to operate,conducive to batch production,and aids in advancing the commercialization of LMB.The LMBs were assembled wi

关 键 词：人工固态电解质界面 金属锂负极 锂金属电池 聚合物 高弹性 

分 类 号：TB332[一般工业技术—材料科学与工程]