Please enable JavaScript.
Coggle requires JavaScript to display documents.
supercapacitor, Khushbu Gohel et al 2020 Mater. Res. Express in press…
supercapacitor
differences from battery
SPECIFIC ENERGY (longer time) vs SPECIFIC POWER (high current)
slow charging vs fas charging
Link Title
problem
cycling stability
leakage problem
low energy density
perfomance depend on
high capacitance
high conductivity
concentratio of charge
ionic mobility
elementary charges
magnitude of valence mobile ion
//overall, variables in above equation depend on the
solvation effect, migration of the solvated ion,
and lattice energy of the salt
Pal, B., Yang, S., Ramesh, S., Thangadurai, V., & Jose, R. (2019). Electrolyte selection for supercapacitive devices: A critical review. Nanoscale Advances. doi:10.1039/c9na00374f
shape of ideal CV supercapacitor
Khushbu Gohel et al 2020 Mater. Res. Express in press
https://doi.org/10.1088/2053-1591/ab6c06
crystalline part provides mechanical integrity whereas higher free volume due to
the amorphous part assist for a traping liquid electrolyte which results in high ionic mobility hence ionic conductivity
these plasticizers are added to host polymer, it plays following roles (i)
reduce ion pairing (dissociation of salt) results in increasing free charge carriers which take part in conduction process and (ii) soften the polymer backbone promotes the higher segmental motion of polymer chains
introducing plasticizers into polymers, the physical structure can be modified that assist for the easier transportation of ions through polymer and leads to enhancement of ionic conductivity and overall performance of the lithium−ion battery. Hence, the fundamental key to promote greater ion-pair dissociation,
high dielectric constant and low viscous properties of plasticizers
are essential.
A serious drawback of using
plasticizers is degrading mechanical strength of polymer electrolytes.
when plasticizer is added to the system, it can interrupt polymer−polymer interaction due to polymer plasticizer interaction and ion plasticizer coordination. This process will create more free volume and a new path for the conduction of ions
From eq. 2, we can conclude that the addition of plasticizers results in a change in mobility and number of charge carriers. The mobility of charge carriers is associated with the structure. Addition of plasticizers softens the polymer backbone which increases the flexibility of polymer segments through which ion can move easily and interact with the polymer matrix ultimately affect the structure. The second conclusion can be drawn that high dielectric constant of plasticizer can dissociate the charge carriers cause an increase in the charge density Therefore, the information regarding the micro-structural features could provide some better explanation on the experimental phenomenon mentioned above
ciri2 supercapacitor yang baik
high ionic conductivity - will significantly reduce the device resistance that enhances the power density of the supercapacitor
Capacitance is the ratio of the amount of electric charge stored on a conductor to a difference in electric potential.
Supercapacitors can achieve high specific capacitance while
maintain a fast charge/discharge rate comparable to conventional capacitors.
supercapacitor measurement
specifice capacitance
To calculate specific capacitance or only capacitance from CV, then you have take the area under CV curve(half of the CV, means take forward scan or reverse scan ), then you will get charge and then divided by scan rate and potential range, you will get capacitance. see the attached images (where, v is scan rate, m is materials loading, delta V is potential range).
https://www.researchgate.net/post/I-want-to-calculate-capacitance-from-CV-data-Can-anybody-please-tell-me-which-value-of-potential-I-have-to-take-for-making-the-calculations
conductivity
masalah gel elektrod
gel electrolytes also have some disadvantages. First, in comparison with an aqueous electrolyte, the effective series resistance of a gel electrolyte is high as it has low ionic conductivity. Second, some gel electrolytes contain corrosive solvent that will be damaging to a fabric electrode as it can dissolve organic fibres and cause the electrode material to become dislodged from the electrode [64]. Third, in comparison with aqueous electrolytes, some organic electrolytes have a higher viscosity, which causes wettability issues resulting in less
electrode material being in contact with the organic electrolyte to form the double-layer structure
https://eprints.soton.ac.uk/417382/1/Sheng_Yong_final_thesis_sy2g11_24791113_.pdf
.
