Attapulgite Enhanced Polyethylene Oxide-Polyvinylidene Difluoride-Based Composite Solid-State Electrolyte for All Solid State Li-Ion Batteries

Abstract

We report an attapulgite-modified poly(ethylene oxide) (PEO) based solid-state composite electrolyte film by solution casting method. The influence of attapulgite and polyvinylidene difluoride (PVDF) on the electrical properties of PEO-based solid-state electrolytes was investigated and it is found that an optimal 3% attapulgite and 10% PVDF in the electrolyte film (0.9PEO-0.1PVDF-LiClO4-3% attapulgite) exhibited a high ionic conductivity of 2.55×10−4 S cm−1 at room temperature and electronic conductivity of 2.25×10−11 S cm−1. Furthermore, The LiFePO4/0.85PEO-0.15PVDF-LiClO4-3% attapulgite/Li all-solid battery exhibited a promising initial discharge capacity of 120 mAh g−1, and even after 10 cycles at 0.1 C, the specific capacity values of the all-solid battery remained above 60 mAh g−1.