Electrolytes for Electrochemical Supercapacitors

Zhong, Cheng; Deng, Yida; Hu, Wenbin; Sun, Defeng; Han, Xiaopeng; Qiao, Jinli; Zhang, Jiujun

doi:10.1201/b21497

Cited by 59 publications

(45 citation statements)

References 993 publications

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“…In this regard, some controversial results have been reported in literature and, therefore, there is not a consensual explanation. [ 49,50 ] Typically, smaller ions, such as Li + , result in higher conductivity than larger ions. However, the degree of hydration in aqueous medium is superior in alkali metal ions with smaller size, thus, increasing the their effective size in water (hydrated ionic radius), [ 43 ] being less mobile.…”

Section: Resultsmentioning

confidence: 99%

Healable Cellulose Iontronic Hydrogel Stickers for Sustainable Electronics on Paper

Cunha

Martins

Gaspar³

et al. 2021

Adv Elect Materials

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Novel nature‐based engineered functional materials combined with sustainable and economically efficient processes are among the great challenges for the future of mankind. In this context, this work presents a new generation of versatile flexible and highly conformable regenerated cellulose hydrogel electrolytes with high ionic conductivity and self‐healing ability, capable of being (re)used in electrical and electrochemical devices. They can be provided in the form of stickers and easily applied as gate dielectric onto flexible indium–gallium–zinc oxide transistors, decreasing the manufacturing complexity. Flexible and low‐voltage (<2.5 V) circuits can be handwritten on‐demand on paper transistors for patterning of conductive/resistive lines. This user‐friendly and simplified manufacturing approach holds potential for fast production of low‐cost, portable, disposable/recyclable, and low‐power ion‐controlled electronics on paper, making it attractive for application in sensors and concepts such as the “Internet‐on‐Things.”

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Section: Resultsmentioning

confidence: 99%

Healable Cellulose Iontronic Hydrogel Stickers for Sustainable Electronics on Paper

Cunha

Martins

Gaspar³

et al. 2021

Adv Elect Materials

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show abstract

“…While the PC has a wider potential window, low conductivity and higher viscosity at low temperature are its shortcomings. [ 53 ]…”

Section: Megalo‐capacitance Capacitormentioning

confidence: 99%

Metal‐Ion Capacitors with Anion Intercalation Process

Rajalekshmi

Divya

Natarajan

et al. 2021

Adv Energy and Sustain Res

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The advancement of the modern world demands high‐performance electrical energy storage devices such as metal‐ion capacitors and dual‐ion batteries, and they receive much attention recently with the merits of cost‐effectiveness, safety, environmental friendliness, and high operating voltage. This work emphasizes the metal‐ion capacitors (Li+, Na+, and K+) based on the dual‐carbon combination in which anion intercalation endorses the Faradaic reaction and cation involves in the non‐Faradaic process, promising for greater energy density. The role of graphite, anion graphite intercalation compounds, and the information about the megalo‐capacitance capacitor are first discussed. Subsequently, various influencing factors such as the effect of solvent, electrolyte, conducting salt, cations, and anions affecting the intercalation process are debated in detail. In addition, recently emerging various metal‐ion capacitors based on the anion intercalation process are also reviewed. The major challenges present in the development of the anion‐based hybrid capacitor are finally evaluated and an assessment to fulfill the goals for efficient energy storage is provided.

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“…[3][4][5][6][7][8][9] The further development of EDLCs is today oriented towards enhancement of gravimetric/volumetric energy [10][11][12][13] while retaining their high cyclability. Among the various approaches proposed to date, [6,[14][15][16][17][18] hybrid concepts such as merging advantages of Liion and capacitive technologies appear suitable for applications requiring energy storage, but with strict space/mass limitations. [19][20][21][22][23][24] Although the specific and volumetric energy density can be remarkably improved, [25] their cyclability and impact on the environment is still unsatisfactory.…”

Section: Introductionmentioning

confidence: 99%

Towards more Durable Electrochemical Capacitors by Elucidating the Ageing Mechanisms under Different Testing Procedures

Fic

Frąckowiak

et al. 2018

ChemElectroChem

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Electrical double‐layer capacitors (EDLCs) commonly denoted supercapacitors are rechargeable energy storage devices with excellent power and energy delivery metrics intermediate to conventional capacitors and batteries. High‐voltage aqueous electrolyte based EDLCs are particularly attractive due to their high‐power capability, facile production, and environmental advantages. EDLCs should last for thousands of cycles and evaluation of future cell chemistries require long‐term and costly galvanostatic cycling. Voltage holding tests have been proposed to shorten evaluation time by accelerating cell degradation processes. Whether voltage holding can replace cycling completely remains undemonstrated. In this work, a systematic investigation of the influence of testing procedure on cell performance is presented. The state‐of‐the‐art post‐mortem and operando experimental techniques are implemented to elucidate ageing mechanisms and kinetics inside EDLC cells under different testing procedures. Carbon corrosion occurring on the positively polarized electrode leads to the lower active surface area and higher oxygen content. On the contrary, an increase of surface area and micropore volume are observed on the negatively polarized electrode. Repeated galvanostatic cycles at U <1.6 V appears to facilitate the depletion of oxygen species on the positively polarized electrode in comparison with voltage holding, which indicates a more complex degradation mechanism during cycling. Caution is advised when comparing results from different test procedures.

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Electrolytes for Electrochemical Supercapacitors

Cited by 59 publications

References 993 publications

Healable Cellulose Iontronic Hydrogel Stickers for Sustainable Electronics on Paper

Healable Cellulose Iontronic Hydrogel Stickers for Sustainable Electronics on Paper

Metal‐Ion Capacitors with Anion Intercalation Process

Towards more Durable Electrochemical Capacitors by Elucidating the Ageing Mechanisms under Different Testing Procedures

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