# title
Lithium ion conducting polymerized ionic liquid pentablock terpolymers as solid-state electrolytes

# abstract
In this study, a lithium ion conducting polymerized ionic liquid pentablock terpolymer (PILPTP) was investigated as a solid polymer electrolyte (SPE) for lithium ion batteries. The ABCBA pentablock terpolymer, poly(tbS-b-EP-b-MS-b-EP-b-tbS) (tbS=tert-butyl-styrene; EP=ethylene-r-propylene; MS=4-methylstyrene), was brominated and quaternized to covalently attach two different cations (methylimidazolium and methylpyrrolidinium) to the C block and subsequently ion exchanged to form two different TFSI-exchanged PILPTPs (MPyr-TFSI and MIm-TFSI; TFSI=bis(trifluoromethane)sulfonimide). Free standing, mechanically stable, transparent SPE films were produced with MPyr-TFSI and MIm-TFSI containing 1M Li-TFSI/ionic liquid (IL) (IL=EMIm-TFSI or PYR14-TFSI; EMIm=1-ethyl-3-methylimidazolium, PYR14=1-butyl-1-methylpyrrolidinium), referred to as MPyr-TFSI+Li-TFSI/PYR14-TFSI and MIm-TFSI+Li-TFSI/EMIm-TFSI. Both SPEs show promising ionic conductivities, electrochemical stabilities, and stripping and plating stabilities. Specifically, the MIm-TFSI+Li-TFSI/EMIm-TFSI SPE possessed an ionic conductivity of 0.1mScm1 at 28C; the MPyr-TFSI+Li-TFSI/PYR14-TFSI SPE possessed an electrochemical stability window of 4.2V versus Li/Li+ at room temperature; the MPyr-TFSI+Li-TFSI/PYR14-TFSI SPE exhibited stable stripping and plating overvoltage profiles over 500 cycles at 70C. These results demonstrate the feasibility of a PIL multiblock polymer as an SPE for lithium ion batteries.

# authors[].organizations[].label
Texas A&M Engineering Experiment Station (TEES)

# authorList[]
Chen, T., Sun, R., Willis, C., Morgan, B. F., Beyer, F. L., & Elabd, Y. A.