Lowering the Interfacial Resistance in Li6.4La3Zr1.4Ta0.6O12|Poly(Ethylene Oxide) Composite Electrolytes

Cell Reports Physical Science

Gregor Trimmel¹  Eveline Kuhnert²  Lukas Ladenstein²  Christian Slugovc²  H. Martin R. Wilkening²  Anna Jodlbauer²  Daniel Rettenwander² 

[1] Christian Doppler Laboratory for Organocatalysis in Polymerization, Graz University of Technology, Graz, Austria;Institute of Chemistry and Technology of Materials (NAWI Graz), Graz University of Technology, Graz, Austria;

关键词: LLZTO;    PEO;    composite electrolyte;    solid electrolyte;    solid-state battery;   

DOI  :  

来源: DOAJ

【 摘 要 】

Summary: Ceramic-polymer electrolytes are expected to improve safety, energy density, and power of next-generation battery technologies. The realization of this type of battery is, however, hindered by the high interfacial resistance across the ceramic-polymer interface. Here, we report a surface-modification strategy to lower the interfacial resistance by more than four orders of magnitude. For this purpose, we activate the surface-terminated oxygen of Li6.4La3Zr1.4Ta0.6O12 (LLZTO) particles by plasma etching and functionalize them by immersing the LLZTO particles in a (3-glycidyloxypropyl)trimethoxysilane (Si-R) solution to form covalently bonded Si-R layers. The Si-Rs are terminated by an epoxy group that reacts with the hydroxyl group of the poly(ethylene oxide) (PEO) via a ring-opening reaction. The modifications improve the screening of the oxygen polarity of LLZTO particles and lower the free volume between both components, resulting in a LLZTO|PEO interface resistance of 500 Ω cm2 at 20°C, the lowest value reported so far to the best of our knowledge.

【 授权许可】

Unknown