New Insights on the Origin of Chemical Instabilities Between Poly(carbonate)‐based Polymer and Li‐containing Inorganic Materials. Issue 21 (31st August 2022)

• Record Type: Journal Article
• Authors: Meabe, Leire; Zagórski, Jakub; Mecerreyes, David; Aguesse, Frederic; LLordes, Anna
• Is Part Of: Chemphyschem. Volume 23:Issue 21(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-08-31
• Subjects: polycarbonate -- active filler -- inactive filler -- polymer degradation -- lithium hydroxide; Chemistry, Physical and theoretical -- Periodicals; 541.05
• DOI: 10.1002/cphc.202200296
• Languages: English
• ISSNs: 1439-4235

Abstract

Abstract: Composite electrolytes, owing to their ability to combine both polymeric and ceramic properties are promising candidates for Solid‐State‐Batteries (SSBs). In this paper, we assess the effect of ceramic fillers (Li1+x Alx Ti2‐x P3 O12, Li6.55 Ga0.15 La3 Zr2 O12 and Al2 O3 ) in a poly(ethylene oxide carbonate)‐LiTFSI matrix. First, the role of the filler chemistry on thermal and electrochemical properties is evaluated: reduced polymer crystallinity leads to an increased ionic conductivity at low temperatures; and the ionic conductivity at low temperatures (<30 °C) is improved for LLZO filler particles. This behaviour is commonly attributed to new conduction pathways generated within the fillers. However, we also demonstrate that a polymer degradation is induced by the filler chemistry by modifying the polymer chemistry in poly(ethylene glycol), initiated by LiOH that can be found on the LLZO surface. The electrolyte containing LATP or Al2 O3 does not induce any degradation. Hence, special attention must be paid to surface impurities, as degradation may occur. Abstract : Chemical nature of the filler decomposes the carbonate group of a polymer compromising the stability of the composite electrolyte.