4.8 Article

Overcoming the Obstacle of Polymer-Polymer Resistances in Double Layer Solid Polymer Electrolytes

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JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 12, 期 11, 页码 2809-2814

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AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.1c00366

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  1. ERC [771777 FUN POLYSTORE]

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Double-layer solid polymer electrolytes (DLSPEs) achieve stable performance towards lithium metal and high-voltage cathodes by reducing interfacial resistance through increased salt concentration. This strategy offers promising potential for high-energy-density lithium batteries.
Double-layer solid polymer electrolytes (DLSPEs) comprising one layer that is stable toward lithium metal and one which is stable against a high-voltage cathode are commonly suggested as a promising strategy to achieve high-energy-density lithium batteries. Through in-depth EIS analysis, it is here concluded that the polymer-polymer interface is the primary contributor to electrolyte resistance in such DLSPEs consisting of polyether-, polyester-, or polycarbonate-bad SPEs. In comparison to the bulk ionic resistance, the polymer-polymer interface resistance is approximately 10-fold higher. Nevertheless, the interfacial resistance was successfully lowered by doubling the salt concentration from 25 to 50 wt % LiTFSI owing to improved miscibility at the interface of the two polymer layers.

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