Abstract
Conductive polymer polyaniline (PANI) is a hot research topic in pseudocapacitor electrode materials due to its advantages of low preparation cost and high specific capacitance. In this work, PANI and graphene/polyaniline composites (Gr/PANI) were prepared by in-situ chemical polymerization. Biodegradable polymer polylactic acid (PLA), as adhensive of electrode material for supercapacitor was used to replace the traditional adhensive polyvinylidene fluoride (PVDF). The morphology and structure of the materials were characterized by SEM and FTIR. Electrochemical behavior was performed by galvanostrotic charge-discharge (GCD), cyclic voltamphe (CV). Results showed PANI compounded with 50 mg graphene (P-50) exhibit excellent electrochemical behavior. The specific capacitance of P-50/PVDF (348.1 F/g at current density of 0.5 A/g) was 27.8% higher than that of undoped PANI. The specific capacitance maintance of P-50/PLA (71.1% content) was 14.4% less than that of P-50/PVDF (85.5%) after 500 number cycles. In addition, the influence of PLA degradation of 90 days on the electrochemical performance of electrode material was studied. Results showed that the specific capacitance at 1 A/g current density decreased from 232.2 F/g to 166.8 F/g after 90 days, compared with that with PVDF from 303 F/g to 274 F/g, The reduction was 18.5%, and it revealed that the PLA may be used in energy storage devices as degradable adhesive.