New insights for constructing solid polymer electrolytes with ideal lithium-ion transfer channels by using inorganic filler

Abstract

All-solid-state lithium batteries have been regarded as the ultimate solution to the safety problem of the next generation lithium batteries. However, the transport of Li+ between solid-solid interfaces and the growth of lithium dendrites disrupts the research progress of all-solid-state lithium batteries. Herein, the solid polymer electrolyte was prepared by the blending method of PVDF(polyvinylidenefluoride) and CA(celluloseacetate) as matrix and modified MMT(montmorillonite) as a filler. The conductivity of the polymer electrolyte film was 3.40 × 10−4 Scm-1 at 25 °C. The electrochemical stability window was 4.2 V and the transference number was 0.315. Meanwhile, the all-solid-state lithium battery had a specific discharge capacity of 112 mA h g-1 for the first cycle at 0.5 C and 112.9 mA h g-1 after 100 cycles with an average coulomb efficiency of 100 %.