Preparation of Lithium Battery Separator by Non-solvent-induced Phase Separation of Cellulose
In this study,regenerated cellulose lithium battery separator was prepared by NaOH/urea/thiourea dissolution system and non-sol-vent-induced phase separation method,and the electrochemical properties of regenerated cellulose lithium battery separator and commercial polyolefin Celgard 2400 separators and cellulose separators were compared.The results showed that the regenerated cellulose lithium battery separator had a porosity of 56.1%,an average pore size of 305 nm,an electrolyte absorption rate of 339%,a liquid retention rate of 68.9%,and an ionic conductivity of 1.88 mS/cm;the specific capacity reached 156.55 mAh/g,and the Coulombic efficiency was higher than 96%after 100 charge/discharge cycles at a rate of 0.5 C.The Celgard 2400 separator had an ionic conductivity of 0.43 mS/cm,and the specific capacity was only 74.26 mAh/g after 100 charge/discharge cycles at a rate of 0.5 C,and the Coulomb efficiency was lower than 88%.Compared with Celgard 2400 separator,the regenerated cellulose lithium battery separator had higher porosity,better electrolyte wettability,lower internal resistance,faster ion transport speed,as well as the advantages of renewability and environmental friendliness,which made the regenerated cel-lulose lithium battery separator to be a broad application prospect in the field of lithium batteries.
regenerated cellulosenon-solvent-induced phase separationlithium battery separatoralkali/urea system
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