Gel Electrolyte for Solid‐State Electrochromic Cell

Bohnké, O.; Rousselot, C.; Gillet, P.A.; Truche, C

doi:10.1149/1.2069512

Cited by 146 publications

(63 citation statements)

References 14 publications

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“…However, much less has been reported on their application in supercapacitors particularly at extreme temperatures compared to their application in lithium ion batteries. The high capacitance of supercapacitors based on this type of electrolytes is attributed to the fast ion mobility due to the presence of many continuous conduction paths through the solvent [37]. A coin-type supercapacitor cell based on PVdF-HFP/ PC/EC/TEABF4 gel electrolytes and activated carbon electrodes showed a specific capacitance of 123 F g −1 and a good cycleability exceeding 104 cycles with approx.…”

Section: Organic Solvent-containing Polymer Electrolytesmentioning

confidence: 99%

Influence of Temperature on Supercapacitor Performance

Xiong

Kundu

Fisher

2015

SpringerBriefs in Applied Sciences and Technology

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Because of the negligible faradic reactions in double-layer capacitors, heat generated during charge/discharge processes derives mostly from Joule heating, which is determined by internal resistance (or equivalent series resistance, ESR). However, heat generated in pseudo-capacitors derives from both Joule heating and exothermic/ endothermic Faradic reactions. Thus, understanding how temperature affects capacitance and ESR is essential to predict supercapacitor performance under different operating conditions. The general techniques (e.g., CV, constant current-charge/ discharge and EIS) to evaluate capacitance and ESR have been discussed in Sect. 2.4.Many factors contribute to ESR in a supercapacitor: (i) interfacial resistance (contact resistance) between the electrode and the current collectors; (ii) electronic resistance of the electrode material; (iii) resistance of ions migrating through the electrode pores; (v) electrolyte resistance, and (vi) resistance of ions migrating through the separator [2,3]. Consequently, ESR depends on the active area and porosity of electrodes, ionic conductivity of the electrolyte, and physical properties of the separator (e.g., porosity, thickness and tortuosity). Notably, electrolyte resistance is only part of ESR. ESR depends on many factors (e.g., electrode structure, materials, electrolytes, fabrication and temperature). ESR is suggested to be inversely proportional to σ within certain ranges [4], but this relation can be violated. For instance, ESR is more dominated by the carbon electrode resistance and the interface resistance at the current collector than electrolyte resistance, as indicated by a much smaller activation energy of ACN-based supercapacitors than that of the electrolyte [5]. Capacitance is a function of surface area and volume of the electrodes, and ionic conductivity of electrolytes, which strongly depends on temperature variations.The operating temperature strongly influences the properties of electrolytes (e.g., viscosity, solubility of the salt in solvents, ionic conductivity, and thermal stability), leading to dramatic changes of capacitance and ESR, particularly at extreme temperatures (ultra-low and ultra-high temperatures). Consequently, the influence of

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Section: Organic Solvent-containing Polymer Electrolytesmentioning

confidence: 99%

Influence of Temperature on Supercapacitor Performance

Xiong

Kundu

Fisher

2015

SpringerBriefs in Applied Sciences and Technology

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“…6,7 The ionic conductivity of poly(methyl methacrylate) (PMMA) gel electrolytes remain very close to that of 10 À3 S/cm at room temperature. 8,9 Polymer electrolyte based on PVC offered low ionic conductivity at ambient temperature. 10,11 The choice of individual components in the electrolyte material is crucial.…”

Section: Introductionmentioning

confidence: 99%

Li ion conduction behavior of hybrid polymer electrolytes based on PEMA

Rajendran

Prabhu

Rani

2008

J of Applied Polymer Sci

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Poly(vinyl chloride)/Poly(ethyl methacrylate) (PVC)/(PEMA)-based blend polymer electrolytes comprising a combination of PC (Propylene carbonate) as a plasticizer and LiClO 4 as a salt have been prepared by solvent casting technique with varying salt concentration ratios systematically. The prepared electrolytes were subjected to X-ray diffraction, Fourier transform infrared spectroscopy, conductivity studies, thermogravimetric/differential thermal analysis and Scanning electron microscopic studies. PVC/PEMA polymer blend electrolyte with 8 wt % of lithium salt exhibited ionic conductivity of the order of 10 À3 S/cm at room temperature.

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“…However, they can be eliminated by proper pretreatment processes before use. For instance, thermal stability of electrolytes consisting of PMMA/LiClO 4 /PC has been noticeably enhanced before (T onset ≈ 160°C) and after (T onset ≈ 240°C) heat treatment [94]. Various factors that affect the thermal stability of different polymer electrolytes have been discussed in this section.…”

Section: Thermal Stability Of Polymer Gel Electrolytesmentioning

confidence: 99%

Influence of Temperature on Supercapacitor Components

Xiong

Kundu

Fisher

2015

Thermal Effects in Supercapacitors

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Among the major thermophysical properties of electrolytes, thermal stability and ionic conductivity are the most two crucial properties in determining the thermal performance of supercapacitors. The former determines the usable temperature range of supercapacitor devices, and the latter dictates the electrochemical performance at different temperatures. This section generally introduces the relationships among the critical thermophysical properties of electrolytes, followed by a discussion of the thermal stability and ionic conductivity of different common electrolytes.

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Gel Electrolyte for Solid‐State Electrochromic Cell

Cited by 146 publications

References 14 publications

Influence of Temperature on Supercapacitor Performance

Influence of Temperature on Supercapacitor Performance

Li ion conduction behavior of hybrid polymer electrolytes based on PEMA

Influence of Temperature on Supercapacitor Components

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