The cellulose-based polydopamine
modified separator (LID-PDA) and
polydopamine/graphene/polypyrrole modified electrode (LID-PDA-GR/PPy)
were successfully fabricated by dissolving–regenerating and
phase-inversion methods via dopamine polymerization and doping modification
of graphene (GR) and polypyrrole (PPy) in a lithium chloride/N,N-dimethylacetamide solvent system. The
structure and physical properties of the LID-PDA film material play
a positive role in its application in supercapacitor separators and
electrodes. The effect of PPy content on the electrochemical performance
of the electrode shows that the LID-PDA-GR/PPy-30 electrode has the
best performance (2.2 Ω, 237.2 F/g at 0.5 A/g). The cellulose-based
supercapacitor assembled from the LID-PDA-GR/PPy-30 electrode and
LID-PDA separator shows good electrochemical energy storage properties
(439.0 F/g at 0.2 A/g, 36.2 Wh/kg corresponding to 2.2 kW/kg). Based
on the microstructural properties of natural and renewable cellulose
substrates, combining polymerization and doping to realize the complementarity
between materials is meaningful for the application and development
of energy storage materials.
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