Electrochemical properties of a ceramic-polymer-composite-solid electrolyte for Li-ion batteries

다국어 초록 (Multilingual Abstract)

<P><B>Abstract</B></P> <P>This study reports on the fabrication of a ceramic-polymer-composite electrolyte with liquid electrolyte, consisting of Li<SUB>1.3</SUB>Ti<SUB>1.7</SUB>Al<SUB>0.3</SUB>(PO<SUB>4</SUB>)<SUB>3</SUB> (LTAPO) ceramic powder, polytetrafluoroethylene (PTFE) polymer and 1M LiPF<SUB>6</SUB> in EC/DMC liquid electrolyte. The morphologies of the LTAPO, LTAPO–PTFE composite membrane, and LTAPO–PTFE–LiPF<SUB>6</SUB>–EC/DMC composite electrolyte were analyzed using a scanning electron microscopy (SEM). The effect of the liquid electrolyte on the ionic conductivity of the prepared ceramic-polymer electrolyte was investigated using electrochemical impedance spectroscopy (EIS). The room temperature ionic conductivities of the LTAPO–PTFE–LiPF<SUB>6</SUB>–EC/DMC composite electrolyte and the LTAPO ceramic electrolyte exhibited 2.94×10<SUP>−4</SUP> S/cm and 8.36×10<SUP>−4</SUP> S/cm, respectively. The first charge capacity of the LTAPO–PTFE–LiPF<SUB>6</SUB>–EC/DMC composite electrolyte cell reached 118mAh/g at 0.06mA/cm<SUP>2</SUP> current density. The electrochemical performance of the ceramic-polymer-composite electrolyte cell was better than that of the ceramic solid electrolyte cell.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Flexible ceramic-polymer composite film was successfully fabricated as an electrolyte. </LI> <LI> The added liquid electrolyte improved the contact of both the LTAPO powder and the electrode/electrolyte. </LI> <LI> The flexible composite electrolyte cell exhibited excellent cycling performance. </LI> </UL> </P>