期刊
ADVANCED MATERIALS
卷 34, 期 32, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202110333
关键词
hairy nanoparticles; in situ polymerization; nanoparticle dispersion in polymeric host; solid polymer electrolytes; solid-state lithium-metal batteries
类别
资金
- Department of Energy Basic Energy Sciences Program [DE-SC0016082]
- National Science Foundation [IIP-1919013]
- NSF MRSEC program [DMR-1719875]
Solid-state electrolytes formed by polymerization of liquid precursor provide a promising strategy for overcoming problems with electrolyte wetting in solid-state batteries. Hybrid solid-state polymer electrolytes created by in-situ polymerization of a conventional liquid precursor containing nanostructures offer a mechanism for selectively reinforcing or adding new functionalities to the electrolyte. The interaction between the polymer and nanostructures affects the electrochemical characteristics and ion-transport properties of the electrolyte.
Solid-state electrolytes (SSEs) formed inside an electrochemical cell by polymerization of a liquid precursor provide a promising strategy for overcoming problems with electrolyte wetting in solid-state batteries. Hybrid solid-state polymer electrolytes (HSPEs) created by in situ polymerization of a conventional liquid precursor containing electrochemically inert nanostructures are of particular interest because they offer a mechanism for selectively reinforcing or adding new functionalities to the electrolyte-removing the need for high degrees of polymerization. The synthesis, structure, chemical kinetics, ion-transport properties and electrochemical characteristics of HSPEs created by Al(OTf)(3)-initiated polymerization of 1,3-dioxolane (DOL) containing hairy, nano-sized SiO2 particles are reported. Small-angle X-ray scattering reveals the particles are well-dispersed in liquid DOL. Strong interaction between poly(ethylene glycol) molecules tethered to the SiO2 particles and poly(DOL) lead to co-crystallization-anchoring the nanoparticles in their host It also enables polymerization-depolymerization processes in DOL to be studied and controlled. The utility of the in-situ-formed HSPE, is demonstrated first in Li|HSPE|Cu half cells, which manifest Coulombic efficiencies (CE) values approaching 99%. HSPEs are also demonstrated in solid-state lithium-sulfur-polyacrylonitrile (SPAN) composite full-cell batteries. The in-situ-formed Li|HSPE|SPAN cells show good cycling stability and thus provide a promising path toward all-solid-state batteries.
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