Design of polyimide-based separators for effective suppression of self-discharge in non-aqueous electrical double layer capacitors

Electrospun Benzimidazole-Based Polyimide Membrane for Supercapacitor Applications

“…As shown in Figure 4 A, a small weight loss occurred at around 100 °C while a large weight loss occurred at temperatures greater than 500 °C. The initial weight loss is the result primarily of the loss of water through evaporation, while the latter loss is attributed to the thermal decomposition of the polymer backbone [ 13 , 14 , 15 ]. The 5 wt.% weight-loss temperature is equal to 527 °C, and the amount of carbonized residue of the polymer material at a temperature of 800 °C is 73.7%.…”

“…Liu et al [ 14 ] synthesized membranes with an improved modulus and tensile strength of 5.7 GPa and 180 MPa, respectively, achieved through a closer packing of the polymer chains. Hu et al [ 15 ] prepared polyimides-based separators using an electrospinning method. The separators not only had a high mechanical strength and thermal stability but also a high ionic conductivity in electrochemistry applications due to their high porosity.…”

“…Polyimides (PIs) have been extensively studied due to their excellent mechanical and electrical properties and superior chemical and thermal stability [ 13 , 14 , 15 , 16 , 17 ]. PIs have been widely used to fabricate many different membranes, fibers, coatings and adhesives [ 16 , 17 , 18 , 19 ].…”

Investigation of Self‐Discharge Behavior on Electrical Double‐Layer Capacitors by Hybrid Mechanism Simulation

“…SD refers to the spontaneous voltage decay across the capacitor that occurs when the capacitor is left unconnected to either a charging circuit or an electrical load after being charged, which determines the energy storage time and has become one of the challenges of the applications of EDLCs. [14][15][16][17] It is the characteristic of EDLCs, which exists even after one charge process and is different from the long-time failure mode in the aging test.To date, most of the investigations are focused on the factors and the methods to suppress the SD process of EDLCs, including the research on the component, the type and the preparative technique of electrolyte, [18][19][20][21][22] separator, [23][24][25][26][27] and AC, [28][29][30][31][32] while the studies discussing the mechanism behind the SD process are limited. Conway et al [33] proposed three kinds of SD models originally: activation-controlled faradaic process, ohmic leakage process, and diffusion control process.…”

“…To date, most of the investigations are focused on the factors and the methods to suppress the SD process of EDLCs, including the research on the component, the type and the preparative technique of electrolyte, [18][19][20][21][22] separator, [23][24][25][26][27] and AC, [28][29][30][31][32] while the studies discussing the mechanism behind the SD process are limited. Conway et al [33] proposed three kinds of SD models originally: activation-controlled faradaic process, ohmic leakage process, and diffusion control process.…”