Structure, thermal and electrical properties of PVDF-HFP/LiBOB solid polymer electrolyte

Abstract

Solid polymer electrolyte (SPE), which is composed of poly (vinylidenefluroride-co-hexafluoropropylene) (PVDF-HFP), lithium bis(oxalate) borate (LiBOB) salt and various concentrations of TiO2 as filler, has been prepared by solution casting technique. Structure, thermal and electrical properties of the SPE were examined using XRD and SEM, TG/DSC, and impedance spectroscopy, respectively. XRD analysis reveals amorphous nature of PVDF-HFP / LiBOB and TiO2 composite matrix. SEM photographs of polymer electrolyte membrane indicate good compatibility between polymer, salt, and other contents as well as amorphous phase formation in the fabricate of SPE. We obtained that (SPE) with composition of 70 wt% polymer, 28 wt% LiBOB and 2 wt% TiO2 has highest conductivity. XRD and DSC analysis indicate that the conductivity increases due to high amount of amorphous nature content. We suggest that the amorphous nature content may enhance segmental flexibility of polymeric chains and disordered structure of the electrolyte.

Stable composite electrolytes of PVDF modified by inorganic particles for solid‐state lithium batteries

“…Samples with various LLZNTO contents showed that porosity first dropped and then increased with increased LLZNTO from 5 to 20 wt.% (Table 1). This was because excess LLZNTO addition led to agglomeration and some pores that were filled might again reform a porous structure 25 . The minimum porosity, at 2.6% of PTLs, was attained with 15 wt.% LLZNTO content.…”

“…Moreover, inorganic fillers of garnet‐type LLZNTO containing a high concentration of Li vacancy should supply an abundant Li + transferring channel 15 . However, the conductivity of the composite electrolyte is decreased during the content of LLZNTO is over to 15 wt.%, which may be due to the aggregation of the ceramic particles in the electrolyte membrane, and thus hinder the transmission of Li ions 25 …”

“…In addition, as with SPEs, PVDF‐based electrodes also possess wider electrochemical windows, thermal stability, and superior mechanical strength 19,21 . Nevertheless, it remains challenging to explore this area because of unsatisfactory ionic conductivity at RT 25 . To improve conductivity, several strategies, such as forming block copolymers, cross‐linking, and adding plasticizers, have been intensively studied 21 .…”

“…19,21 Nevertheless, it remains challenging to explore this area because of unsatisfactory ionic conductivity at RT. 25 To improve conductivity, several strategies, such as forming block copolymers, cross-linking, and adding plasticizers, have been intensively studied. 21 It is considered that the most convenient and important means for improving Li + conductivity is to introduce inorganic ceramic fillers or small organic plasticizers into a polymer matrix.…”

Kontribusi Aditif Succinonitrile (Sn) Pada Performa Elektrolit Padat Libob Untuk Baterai Li-Ion

“…Tidak nampaknya puncak leleh SN dan terbentuknya puncak titik leleh baru atau puncak fasa transisi mengindikasikan bahwa fasa transisi SN telah terjadi perubahan fasa dari monoclinic (beraturan) menjadi fasa amorf (tidak beraturan). Temperatur leleh (T m ) SN adalah 49 ºC [19], sehingga dengan penambahan aditif SN akan meningkatkan kelarutan garam LiBOB dengan harapan dapat meningkatkan konsentrasi LiBOB. Pengujian konduktivitas dengan kondisi pengukuran pada temperatur ruang diperlihatkan seperti pada Gambar 4.…”