Products Cited in Publications Worldwide Synthesis and Characterization of Tethered Polymer for Hybrid Electrolytes in Solid Lithium-Metal Batteries

Synthesis and Characterization of Tethered Polymer for Hybrid Electrolytes in Solid Lithium-Metal Batteries

Rahmati, Ziba; Wu, Nan; Collins, Coby; Lu, Jiaxin; Stefik, Morgan; Huang, Kevin

DOI:

Abstract

This study investigates a hybrid polymer-ceramic composite electrolyte for solid-state batteries. The polymer is synthesized through the copolymerization of poly(ethylene glycol) methacrylate and poly(methacrylic acid) via the reversible addition−fragmentation chain transfer (RAFT) method followed by postsynthetic functionalization to add phosphonic acid groups, yielding poly(PEGMA-ran-DEPMMA) that can covalently bind to oxide surfaces (Tpoly). The ceramic phase is porous gadolinium-doped cerium oxide (GDC) with a graded porosity made by a phase inversion method. Both monomers in Tpoly interact with anions synergistically for Li-ion conduction. In addition, the binding of phosphonic acid with GDC improves the interfacial stability. A Li symmetric cell with this hybrid electrolyte demonstrated stable performance for over 2000 h at 0.1 mA cm-2 with a critical current density of up to 0.8 mA cm-2. The interfacial resistance of this hybrid electrolyte/Li electrode is reduced by 50% as compared to nontethered PPEGMA. The findings highlight the potential of hybrid polymer-ceramic composites in overcoming interfacial challenges of solid-state lithium-metal battery technology.

Keywords

composite electrolytes ; porous ceramic scaffold ; RAFT polymerization ; phosphonic acid binding ; interfacial stability

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Diethyl (hydroxymethyl)phosphonate

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