Sodium-ion-conducting polymer nanocomposite electrolyte of TiO2/PEO/PAN complexed with NaPF6

Abstract

A free standing transparent film of solid state polymer electrolyte based on PEO/PAN + NaPF6 with different compositions of nano sized TiO2 in weight percent (x = 0, 1, 2, 5, 10, 15, 20 ) is synthesized by using standard solution cast technique. The homogeneous surface of above polymer composition is examined by FESEM. The microscopic interaction among polymer, salt and nanoceramic filler has been analyzed by Fourier Transformed Infra-Red (FTIR) spectroscopy. The reduction of ion pair formation in polymeric separator is clearly observed on addition of nanofiller in the polymer salt complex film. Electrical conductivity has been recorded of the prepared polymeric separator which is of the order of ~10 -3 Scm -1 after addition of nanofiller (15% wt/wt) which support the FTIR results. Electrochemical potential window has been observed of the order of ~6V by the cyclic voltammetry results. The observed data of the prepared separator are at par with the desirable value for device applications.

Electrolyte and Interface Engineering for Solid-State Sodium Batteries

“…The common polymer matrices for SSE are PEO, poly(vinylidene fluoride) (PVDF), poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP), poly(acrylonitrile), and poly(methacrylate). [95][96][97][98][99] The additive salts mainly contain NaPF 6 , NaClO 4 , (NaFSI). The main problems of most polymer electrolyte are low ionic conductivity (<10 À4 S cm À1 ) at room temperature and unsatisfactory Na + -ion transference number (less than 0.5).…”

“…Co-polymerization, blending, crosslinking, and combination with plasticizers are proven to be effective in achieving the goal. 12,[95][96][97][98][99][100][101][102] For instance, our group fabricated quasi-SSE composed of PVDF-HFP matrix with SiO 2 and NaClO 4 -TEGDME (tetraethylene glycol dimethyl ether) additives ( Figure 6A). 95 The ionic conductivity of the electrolyte can reach as high as 10 À3 S cm À1 at room temperature.…”

“…In fact, most polymer electrolyte exhibits a wide electrochemical stable window (>4 V versus Na + /Na). 27,95,98,100 Nevertheless, there are few reports about the application of a high-voltage cathode (>4 V) in solid-state sodium batteries with polymer electrolyte. By adding ethylene carbonate-propylene carbonate mixed solvent, the perfluorinated sulfonic-based electrolyte exhibits ionic conductivity of 2.8 3 10 À4 S cm À1 at room temperature.…”

Solid-State Electrolytes for Sodium Metal Batteries

“…When the nano-TiO 2 content was 5 wt %, the SPE with the ratio of EO/Na = 20:1 showed a maximum ionic conductivity of 2.62 × 10 –4 S cm –1 at 60 °C (Figure c). In addition, a free-standing SPE film based on PEO/PAN + NaPF 6 with different dosages of nano-TiO 2 was fabricated by Sharma’s group . The results indicated that the as-prepared (PEO/PAN) 20 + NaPF 6 + 15 wt % TiO 2 composite film exhibited optimized ionic conductivity of 1.8 × 10 –4 S cm –1 .…”