Improved Li+ transport in Polyacetal Electrolytes: Conductivity and Current Fraction in a Series of Polymers

The efficacies of two polymer electrolytes, P(EO-MO) and P(EO-2MO), from our series of polymers is nearly 150% higher than PEO.

Scientific Achievement

Our team identified several polymer electrolytes that outperform Li-ion transport in PEO by nearly 150% based on conductivity and current fraction measurements.

Significance and Impact 

Non-flammable polymer electrolytes mitigate safety concerns in Li-ion batteries but suffer from poor ion transport properties. We designed and studied a systematic series of polymer in order to identify structure-property trends that allow us to design and identify high-performance polymer electrolytes.

Research Details

  • The Coates Group synthesized a series of five polyacetal polymer electrolytes by systematically changing the ratio of ethylene oxide (EO) to methylene oxide (MO) units in the polymer
  • The Balsara Group measured Li-ion conductivity and current fraction in the polymers. Although conductivity decreased four-fold with increasing MO content, the current fraction increased nearly five-fold
  • We calculated the overall efficacy of Li-ion transport in the polymer electrolytes. Several polymers showed higher efficacy than PEO.

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