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Synergistic Enhancement of Mechanical and Electrochemical Properties in Grafted Polymer/Oxide Hybrid Electrolytes. | LitMetric

Lithium metal batteries operated with high voltage cathodes are predestined for the realization of high energy storage systems, where solid polymer electrolytes offer a possibility to improve battery safety. AlO_PCL is introduced as promising hybrid electrolyte made from polycaprolactone (PCL) and AlO nanoparticles that can be prepared in a one-pot synthesis as a random mixture of linear PCL and PCL-grafted AlO. Upon grafting, synergistic effects of mechanical stability and ionic conductivity are achieved. Due to the mechanical stability, manufacture of PCL-based membranes with a thickness of 50 µm is feasible, yielding an ionic conductivity of 5·10 S cm at 60 °C. The membrane exhibits an impressive performance of Li deposition in symmetric Li||Li cells, operating for 1200 h at a constant and low overvoltage of 54 mV and a current density of 0.2 mA cm. NMC| AlO_PCL | Li cells are cycled at rates of up to 1 C, achieving 140 cycles at >80% state of health. The straightforward synthesis and opportunity of upscaling as well as solvent-free polymerization render the AlO_PCL hybrid material as rather safe, potentially sustainable and affordable alternative to conventional polymer-based electrolytes.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11579982PMC
http://dx.doi.org/10.1002/smll.202404537DOI Listing

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