Novel composite polymer electrolytes based on methylcellulose-pectin blend complexed with potassium phosphate and ethylene carbonate

• Published in: Biomass conversion and biorefinery Vol. 14; no. 10; pp. 11665 - 11682
• Main Authors: Adam, Abdullahi Abbas, Soleimani, Hassan, Shukur, Muhammad Fadhlullah Bin Abd, Dennis, John Ojur, Hassan, Yarima Mudassir, Abdulkadir, Bashir Abubakar, Yusuf, Jemilat Yetunde, Ahmed, Omar Sami Sultan, Salehan, Shahira Shaura, Ayub, Saba, Abdullahi, Suleiman Shuaibu
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-05-2024; Springer Nature B.V
• Subjects: Biopolymers; Biotechnology; Electrolytes; Energy; Homogeneity; Ion currents; Molten salt electrolytes; Original Article; Pectin; Phase separation; Photomicrographs; Polymers; Potassium; Potassium phosphates; R&D; Renewable and Green Energy; Research & development; Room temperature; Solid electrolytes; Solution casting; CPE; Potential window; EDLC
• ISSN: 2190-6815; 2190-6823
• DOI: 10.1007/s13399-022-03202-9

In large-scale all-solid-state storage technologies, solid polymer electrolytes (SPEs) provide greater safety and longer cycle life than traditional liquid or gel polymer electrolytes. Polymer electrolytes (PEs) derived from biopolymers have been intensively explored for use in electrochemical devices due to their great flexibility, low cost, and environmental sustainability. However, biopolymer-based electrolytes cannot meet the expectations of practical applications at room temperature due to their low ionic conductivity. Over the years, improving the performance of this class of electrolytes has been the focus of intense research and development, notably polymer blending, plasticization, and structural functionalization. Here, we investigate the performance of an all-biopolymer solid electrolytes based on a methylcellulose-pectin blend doped with potassium phosphate. FESEM micrographs, as well as the shifting and changing intensity of FTIR bands in the electrolyte specimens confirm the polyblend homogeneity with no phase separation. The increased amorphous fraction of the composite polymer electrolytes (CPEs) is seen in the XRD and DSC patterns of the plasticized and unplasticized samples. Impendence studies performed on the system recorded a maximum ionic conductivity of 1 × 10
–5
Scm
−1
by doping with 50 wt.% K
3
PO
4
. This value further increased to 5.9 × 10
–4
Scm
−1
upon adding 25 wt.% EC to the polymer system. This sample also possesses an electrochemical stability window of 4.24 V and an ion transference number of 0.95.