Design of Polymer Nanocomposite Electrolytes towards All-solid-state Lithium Batteries

Xiaoen Wang

Institute for Frontier Materials, Deakin University

 

Abstract: Compared with traditional flammable carbonate-based liquid electrolytes, solid-state electrolytes with high conductivity and mechanical integrity are attractive candidates to achieve high safety all-solid-state lithium batteries. Organic ionic plastic crystals (OIPCs), and their homologues of ionic liquids, possessing the features of low flammability, negligible volatility, and high thermal/electrochemical stability, have shown promising properties as solid electrolyte materials. In this talk, we will present our recent work on designing of solid-state composite electrolytes based on OIPC and ionic liquid materials.

OIPCs normally show relatively slow ion dynamics especially in the low temperature crystal phase. Our previous research reveals that incorporation of nano particles, or electrospun polymer fibers can effectively improve the molecular dynamics of OIPCs due to interfacial effects, thus OIPC-based composite electrolytes with enhanced ionic conductivity can be obtained by incorporation of these nanofillers. Inspired by this mechanism, highly conductive nanocomposite electrolytes are designed using a new pyrrolidinium based OIPC (N-ethyl-N-methylpyrrolidinium bis(fluorosulfonyl)amide, [C2mpyr][FSI]) to form OIPC coated nano-PVDF particles. The long-term room temperature charge/discharge performance using OIPC-PVDF nanocomposites with varying cathodes will be discussed. Furthermore, for solid electrolytes using ionic liquids, novel polymerized ionic liquid (polyILs) polymer hosts are proposed for the design of highly conductive and free-standing ion gel electrolytes. The effects of polyIL content and nanofiller addition (nanoparticles or nanofibers) on the ion dynamics and electrochemical behaviour of the nanocomposites will also be described in this report.

 

Biography: Xiaoen Wang graduated with a PhD in Material Science from Wuhan University of Technology, China in 2011. After graduation, he worked as a research associate in Huazhong University of Science & Technology (HUST), China. Then Xiaoen joined Prof. Maria Forsyths group in 2014 as a research fellow in Deakin University, Australia.

Xiaoens research focuses on designing of high performance composite electrolyte materials for energy storage and conversion devices such as lithium ion batteries, polymer electrolyte membrane fuel cells (PEMFCs). In 2012, Dr. Wang started his work in gel polymer electrolytes and nano composite polymer electrolytes for lithium ion batteries under the supports from National Natural Science Foundation of China and China Postdoctoral Science Foundation (as first PIs). In 2014, Dr. Wang joined in Prof. Maria Forsyths group working on solid state composite electrolytes based on organic ionic plastic crystals/polymer composites, and understanding of interfacial effects on ion transport and dynamics in these novel systems.