摘要
有机/无机复合电解质被认为是全固态锂电池中最具潜力的固态电解质之一,但由于无机填料易团聚,通过提高无机填料含量来改善复合电解质的电导率难有成效。此外,在全固态锂电池中,电解质和电极之间松散的固-固接触造成过大的界面阻抗,限制了全固态锂电池的性能。本研究采用固相法合成具有Li^+连续传输通道的自支撑三维多孔Li6.4Al0.1La3Zr1.7Ta0.3O12骨架,并利用原位聚合的方法构筑一体化电解质/电极固-固界面。此策略指导合成的复合电解质的室温电导率可达1.9×10^−4 S·cm^−1。同时,一体化的界面使得Li-Li对称电池的界面阻抗从1540Ω·cm^2降低至449Ω·cm^2,因此4.3 V(vs.Li^+/Li)的LiCoO2|Li全固态锂电池展现出良好的电化学性能。
Organic/inorganic composites have been considered as promising electrolyte candidates in all solid-state lithium batteries.Aiming at improving the conductivity significantly by increasing the frequently-used 0D or 1D ceramic nano-fillers to high content is unsuccessful due to the particle tendency to agglomeration.What's worse,the loose contact between the solid electrolyte and solid electrodes is much of a serious barrier to the performance and thus to the application of all solid-state lithium batteries.Herein,self-supported 3D porous Li6.4Al0.1La3Zr1.7Ta0.3O12 frameworks are employed to provide percolated fast Li^+conductive pathway while in-situ polymerization of poly(ethylene glycol)methyl ether acrylate can integrate the loose solid-solid interface and reduce the interfacial resistance efficiently.Inspiringly,the Li^+conductivity of the composite exhibits 1.9×10^−4 S·cm^−1 at room temperature.The interfacial resistance in Li-Li batteries decreases significantly from 1540 to 449Ω·cm^2,rendering good capacity and cyclability of the 4.3 V(vs.Li^+/Li)LiCoO2|Li all solid-state lithium battery.
作者
颜一垣
鞠江伟
于美燕
陈守刚
崔光磊
YAN Yiyuan;JU Jiangwei;YU Meiyan;CHEN Shougang;CUI Guanglei(School of Materials Science and Engineering,Ocean University of China,Qingdao 266100,China;Qingdao Institute of Bioenergy and Bioprocess Technology,Chinese Academy of Sciences,Qingdao 266101,China)
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2020年第12期1357-1364,I0004-I0005,共10页
Journal of Inorganic Materials
基金
国家自然科学基金(51902325)。
关键词
固态复合电解质
原位聚合
多孔骨架
全固态电池
solid composite electrolyte
in-situ polymerization
porous framework
all solid-state battery
