Journal
JOURNAL OF ENERGY STORAGE
Volume 62, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.est.2023.106838
Keywords
All -solid-state battery; Cellulose nanofiber; Flame retardant; Ionic conductivity; lithium -ion battery; Phosphorylation; Polymer electrolyte
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Phosphorylated cellulose nanofiber (CNF-P) is a novel organic filler for composite solid polymer electrolytes (SPE). The incorporation of phosphorus enhances the flame-retardant property of cellulose nanofiber. The resulting SPE, prepared using CNF-P and poly(ethylene oxide) as matrix, shows improved mechanical properties and high conductivity values, making it viable for solid-state batteries.
Phosphorylated cellulose nanofiber (CNF-P) is presented as novel and promising organic filler for the preparation of composite solid polymer electrolytes (SPE). The degree of phosphorylation was evaluated, and the CNF-P was characterized. The results show that the phosphorus incorporation promotes the flame-retardancy property of cellulose nanofiber. Solid polymer electrolytes were prepared using CNF-P and the poly(ethylene oxide) as a matrix and lithium bis(trifluoromethanesulfonyl)imide salt (LiTFSI), with a molar ratio of [EO]/[Li+] similar to 20. The incorporated CNF-P improved significantly the mechanical properties of the resulting SPE, especially its tensile strength reaching a value of 45 MPa. The resulting composite polymer electrolytes showed practical conductivity values exceeding 10(-4) S/cm at 70 degrees C and provide a wide electrochemical stability window above 5 V vs Li/Li+. Cycling performances of these composite SPEs have been evaluated in an all-solid-state battery half-cell configuration using Li metal anode and LiFePO4/C cathode showing the viability of such fillers in solid polymer electrolytes.
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