3-D microbattery electrolyte by self-assembly of oligomers

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• 作者：Semra Tan^a ; Sylwia Walus^a ; Torbjö ; rn Gustafsson^a ; Daniel Brandell ;   ; ^a ;   ; ^{Daniel.Brandell@mkem.uu.se}
• 关键词：Polymer electrolyte ; 3D-microbattery ; Polymer blend ; Ionic conductivity
• 刊名：Solid State Ionics
• 出版年：2011
• 出版时间：19 September 2011
• 年：2011
• 卷：198
• 期：1
• 页码：26-31
• 全文大小：725 K

文摘

This paper reports the preparation and characterization of novel thin film electrolytes by UV cross-linking of poly(propylene glycol) diacrylate in the presence of polyetheramine (glyceryl poly(oxypropylene)triamine) and LiTFSI. The oligomeric surfactant polyetheramine facilitates self-assembly of the electrolyte, enabling it to be applied conformally onto a complex substrate which is necessary for 3D-microbatteries, while the acrylate network supplies mechanical stability. Conformal coatings onto LiFePO₄ electrodes and Cu nanopillars were confirmed by SEM. Ionic conductivities of 3.5 ¡Á 10^?6 and 5.8 ¡Á 10^?5 S/cm were measured at room temperature and 60 ¡ãC, respectively, at Li:O = 1:20 and PEA:PPGDA = 2:1 ratios. The electrochemical stability window test showed that the electrolyte is stable above 5.0 V vs. Li/Li⁺. Thermal analyses by TGA and DSC demonstrated that the polymer electrolyte is amorphous and thermally stable up to 300 ¡ãC.