| Popis: |
Solid-state electrolytes have emerged as a promising solution for exploiting safe and high-performance lithium batteries. However, the polymer electrolytes with insufficient mechanical strength cannot suppress lithium dendrites effectively, the problem of short-circuit cells failure even under low current density mainly induced by the growth of lithium dendrites still exists and impedes the further application of all-solid-state lithium metal batteries. In order to achieve the high critical current density, we designed a polymer/ceramic composite electrolyte with enhanced mechanical properties by combining Li_1.3 Al_0.3 Ti_1.7 [(PO_4)]_3 (LATP) and polyvinylidene fluoride (PVDF). Meanwhile, three major parameters during the fabrication process were optimized by Taguchi method to get the optimal group (A3B3C2). An orthogonal array and signal to noise (S/N) ratio were used to investigate the contributions and effects of the three parameters on critical current density. Then the design assumption was validated by the confirmation experiment. The optimized PVDF/LATP composite electrolyte exhibited the highest critical current density of 0.9 mA cm^(-2) compared to other sample groups indicating this method is effective and prospective. In addition, we explored the effects of different LATP contents on critical current density and Li ion transference number, the results showed best performance when the weight ratio of LATP:PVDF was 50%. This work provides a prospective method to design and fabricate composite electrolytes with high critical current density for all-solid-state lithium batteries. |
