Polyvinyl formal based single-ion conductor membranes as polymer electrolyte for lithium ion batteries
发表时间：2014-11-20 09:31
Novel single-ion conductor polymer (SCP) membranes based on oxalate-chelated borate structure
grafted polyvinyl formal (PVFM) were developed herein. The membranes and their application as
polymer electrolytes for lithium-ion batteries were characterized by Fourier transformation infrared
spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetry (TG), differential scanning calorimetry
(DSC), stress–strain test, electrochemical impedance spectroscopy (EIS), linear sweep voltammetry (LSV)
and charge/discharge test. Results show that the novel SCP membranes exhibit good thermal stability
and excellent mechanical strength of 11–34 MPa; the obtained gel polymer electrolytes (GPEs) from
propylene carbonate (PC) plasticized SCP membranes show ionic conductivity of 106–105 S cm1
between 15 and 60 1C, wide electrochemical stability window of 45 V (vs. Liþ/Li) and good matching
properties with Li/LiFePO4 cells. The PVFM based SCP membrane shows promising characteristics as
polymer electrolytes for lithium-ion batteries.