MOF/Poly(Ethylene Oxide) Composite Polymer Electrolyte for Solid-state Lithium Battery

Solid polymer electrolytes (SPEs) with high flexibility and processability enable the fabrication of leak-free solid-state batteries with varied geometries.However, SPEs usually suffer from low ionic conductivity and poor stability with lithium metal anodes.Here, we propose nano-sized metal-organic framework (MOF) material(UiO-66) as filler for poly(ethylene oxide) (PEO) polymer electrolyte.The coordination of UiO-66 with oxygen in PEO chain and the interaction between UiO-66 and lithium salt significantly improve the ionic conductivity (3.0×10 -5 S/cm at 25 ℃, 5.8×10 -4 S/cm at 60 ℃) and transference number of Li + (0.36), widen the electrochemical window to 4.9 V (vs Li + /Li), enhance the stability with lithium metal anode.As a result, the as-prepared Li symmetrical cells can continuously operate for 1000 h at 0.15 mA•cm -2 , 60 ℃.The results show that UiO-66 filler is effective to improve the electrochemical performance of polymer electrolyte.