Built-in Polymerized Elastomer Electrolytes for Highly Stable Li Metal Batteries
발표자
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초록
내용
All-solid-state lithium metal batteries (ASSBs) have gained much attention to address unstable issues of Li metal by replacing organic liquid electrolytes with solid-state polymer electrolytes (SPEs). SPEs simultaneously satisfying high ionic conductivity, mechanical stability, low interfacial resistance and wide electrochemical stability are necessary to actualize high performance of ASSBs. In here, we introduce a new class of built-in PCEEs that succinonitrile is embedded within butyl acrylate-based elastomer matrix by built-in polymerizing liquid solution in assembled electrochemical cells. The symmetric Li cell with the built-in PCEE exhibits an excellent cycling performance with low polarization at high current. Application of built-in PCEEs in 4.5V of Li//NMC(622) demonstrates a high reversible capacity of ~170mAh g-1 at a high current density retaining high Coulombic efficiencies over ~99.8%. Our study suggests a new route for advanced SPEs to achieve high-energy density ASSBs.