Preparation and characterization of PAN–KI complexed gel polymer electrolytes for solid-state battery applications

Abstract

The free standing and dimensionally stable gel polymer electrolyte films of polyacrylonitrile (PAN): potassium iodide (KI) of different compositions, using ethylene carbonate as a plasticizer and dimethyl formamide as solvent, are prepared by adopting 'solution casting technique' and these films are examined for their conductivities. The structural, miscibility and the chemical rapport between PAN and KI are investigated using X-ray diffraction, Fourier transform infrared spectroscopy and differential scanning calorimetry methods. The conductivity is enhanced with the increase in KI concentration and temperature. The maximum conductivity at 30 • C is found to be 2.089 × 10 −5 S cm −1 for PAN:KI (70:30) wt%, which is nine orders greater than that of pure PAN (<10 −14 S cm −1). The conductivity-temperature dependence of these polymer electrolyte films obeys Arrhenius behaviour with activation energy ranging from 0.358 to 0.478 eV. The conducting carriers of charge transport in these polymer electrolyte films are identified by Wagner's polarization technique and it is found that the charge transport is predominantly due to ions. The better conducting sample is used to fabricate the battery with configuration K/PAN + KI/I 2 + C + electrolyte and good discharge characteristics of battery are observed.

Advanced Post‐Potassium‐Ion Batteries as Emerging Potassium‐Based Alternatives for Energy Storage

“…First, Jyothi et al prepared K + conductor GPEs based on PAN and potassium iodide (KI), applying ethylene carbonate (EC) and dimethyl formamide (DMF) as plasticizer and solvent, respectively. [ 100 ] FTIR spectra demonstrated that K + and C=O/CN had a weak interaction. The addition of KI and EC can enhance the flexibility of GPEs by reducing T g and T m values.…”

Recent Advances and Perspectives on the Polymer Electrolytes for Sodium/Potassium‐Ion Batteries

“…In order to meet the performance requirements of PEs for KIBs, the researchers have devoted many efforts to improve the ionic conductivity through polymer blending, [ 192–195 ] copolymerization, [ 196 ] introducing inorganic fillers, [ 197–199 ] and the addition of plasticizer, [ 200 ] which focused to reduce the crystallinity of the polymer matrices and to increase the chain movement ( Table 5 ).…”

“…prepared a GPE membrane with PAN as a PE matrix and EC as the plasticizer. [ 200 ] At 30 °C, the maximum conductivity of PAN/EC/KI (70:30) wt% was 2.089 × 10 −5 S cm −1 . In the study on the thermal stability of CPEs, it was found that the addition of plasticizer reduced the T g and T m values of the GPE, which was conducive to improving the ionic conductivity.…”

Sustainable Functionalization of PAN to Improve Tinctorial Capacity

“…Studies on the interaction between PAN and iodine from alcoholic solutions of I 2 /KI put in evidence polyacrylonitrile doping, which is favored by temperature decrease [26][27][28][29]36]. Other authors [37,38] state that iodine penetrates the polymer crystalline zones and forms a complex with the polyacrylic chain due to its ability to interact with the nitrile group.…”