Solid-state lithium ion battery is regarded as the next generation energy storage device to achieve reliable safety and long cycling. A solvent-free polymer electrolyte with respectable ionic conductivity (&gt;10-4 S cm-1) and compatible with electrode materials is in demand for solid-state systems. Here, we designed and synthesized a semi-interpenetrating polymer network (s-IPN) from the acetonic mixture of poly(proprylene carbonate) (PPC), poly(ethylene glycol) (PEG) oligomer based acrylate monomers, and lithium bis(trifluoromethane)sulfonimidate (LiTFSI) salt using a simple thermal curing method. The amorphous PPC performs as film forming agent, whereas the crosslinked network with PEG pendants conducts lithium ion. The s-IPN architecture inhibits a phase segregation of two different polymers. The curing temperature, crosslinker content and salt ratio were optimized carefully to attain a flexible film with high ionic conductivity. The ion conductive property was correlated with the relevant thermal and physical characteristics of the films prepared under different conditions. Ceramic powder such as lithium lanthanum zirconate Li7La3Zr2O12 (LLZO) was added into the polymer matrix as a filler to further enhance the ionic conductivity which was approximately 10-5 S cm-1 at ambient temperature.

Ionic conducting property of poly(propylene carbonate) interpenetrating cross-linked poly(ethylene glycol) network

255th National Meeting (2018)

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