A single-ion polymer electrolyte based on boronate for lithium ion batteries

A novel single-ion polymer electrolyte, LiPAAOB (lithium oxalate polyacrylic acid borate), was prepared with different ratio of polyacrylic acid, boric acid, lithium hydroxide and oxalic acid. The obtained membranes were characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetry and differential thermal analysis. After absorbing 3% solvent (propylene carbonate), the as-prepared LiOPAAB presents a single ion conductive behavior. Its ionic conductivity at ambient temperature can be up to 2.3 × 10− 6 S cm− 1 and electrochemical window can be stable up to 7.0 V (vs. Li+/Li), which is of great attraction for 5 V lithium ion batteries with high energy density.

► A novel single-ion polymer electrolyte, LiOPAAB, was prepared.
► The structure of LiOPAAB is similar to that of LiBOB.
► Its ambient temperature ionic conductivity can be up to 2.3 × 10− 6 S cm− 1.
► Its electrochemical window can be stable up to 7.0 V (vs. Li+/Li).
► This single polymer electrolyte is of great attraction for 5 V lithium ion batteries with high energy density.