Composite Gel Polymer Electrolyte Based on Poly(vinylidene fluoride hexafluoropropylene) (PVDF HFP) with Modified Aluminum Doped Lithium Lanthanum Titanate (A LLTO) for High Performance Lithium Rechargeable Batteries.
A composite gel polymer electrolyte (CGPE) based on poly(vinylidene fluoride hexafluoropropylene) (PVDF HFP) polymer that includes Al doped Li0.33La0.56TiO3 (A LLTO) particles covered with a modified SiO2 (m SiO2) layer was fabricated through a simple solution casting method followed by activation in a liquid electrolyte. The obtained CGPE possessed high ionic conductivity, a large electrochemical stability window, and interfacial stability all superior to that of the pure gel polymer electrolyte (GPE) In addition, under a highly polarized condition, the CGPE effectively suppressed the growth of Li dendrites due to the improved hardness of the GPE by the addition of inorganic A LLTO/m SiO2 particles. Accordingly, the Li ion polymer and Li O2 cells employing the CGPE exhibited remarkably improved cyclability compared to cells without CGPE. In particular, the CGPE as a protection layer for the Li metal electrode in a Li O2 cell was effective in blocking the contamination of the Li electrode by oxygen gas or impurities diffused from the cathode side while suppressing the Li dendrites.
ACS applied materials interfaces