Optimization of Organic/Water Hybrid Electrolytes for High‐Rate Carbon‐Based Supercapacitor

Xiao, Di; Dou, Qingyun; Zhang, Li; Ma, Yalan; Shi, Siqi; Lei, Shulai; Yu, Haiyun; Yan, Xingbin

doi:10.1002/adfm.201904136

Cited by 120 publications

(112 citation statements)

References 51 publications

(19 reference statements)

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“…10 Wh kg −1 @ 7.6 kW kg −1 81%, 10 000 cycles @ 5 A g −1 AC YP-50F 1533 m 2 g −1 [197] 17 mol kg − 85%, 20 000 cycles @ 5 A g −1 AC YP-50F 1533 m 2 g −1 [199] 6 mol kg − 18.9 Wh kg −1 @ 21.7 kW kg −1 82%, 15 000 cycles @ 5 A g −1 AC [219] KOH (K 2 SO 4 )//H 2 SO 4 (K 2 SO 4 )/H 2 O c)) 2.0 V 36.9 Wh kg −1 @ 248 W kg −1 8.8 Wh kg −1 @ 4 kW kg −1~1 00%, 10 000 cycles @ 5 A g −1 AC [220] KOH//H 2 SO 4 /H 2 O c)) 2. Energy and power densities were based on the total device.…”

Section: Resultsmentioning

confidence: 99%

Perspective on High‐Energy Carbon‐Based Supercapacitors

Dou

Park

2020

Energy & Environ Materials

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Supercapacitors based on carbon materials have advantages such as high power density, fast charging/discharging capability, and long lifetime stability, playing a vital role in the field of electrochemical energy storage technologies. To further expand the practical applications of carbon-based supercapacitors, their energy density, which is essentially determined by the specific capacitance and operating voltage, should be improved. This review provides fundamental knowledge on achieving high energy density of supercapacitors. We first address the relationship of the features of carbon materials, such as the surface area, pore size distribution, and surface functional groups, with their electrochemical performances, such as the gravimetric and volumetric capacitance, surface pseudocapacitance, and operating voltage. Then, we discuss the properties of electrolytes from nonaqueous and aqueous to hybrid one from the thermodynamic and kinetic aspects, and present their effects on capacitance and operating voltage. Finally, we illustrate different cell design strategies and their basic principles for increasing operating voltage. We also highlight the recent advances related to these fields and provide our insight into high-energy supercapacitors.

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Section: Resultsmentioning

confidence: 99%

Perspective on High‐Energy Carbon‐Based Supercapacitors

Dou

Park

2020

Energy & Environ Materials

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151

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“…At present, WiS electrolytes have already been successfully applied to supercapacitors and metal ion batteries to improve their safety. [ 28–32 ] However, the reported WiS and its derivatives with extended working voltage window still cannot meet the requirements for high working voltage DIBs due to the unique anion insertion mechanism. Therefore, matching appropriate electrolytes and electrodes that can fully support the operation of DIBs in a safe manner is fundamentally important to facilitate the practical application of the related batteries.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Aqueous/Nonaqueous Water‐in‐Bisalt Electrolyte Enables Safe Dual Ion Batteries

Zhu

et al. 2020

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The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/smll.201905838. Recently, a new class of aqueous electrolytes named "waterin-salt (WiS)" formulated with superconcentrated lithium salts Dual ion batteries (DIBs) have recently attracted ever-increasing attention owing to the potential advantages of low material cost and good environmental friendliness. However, the potential safety hazards, cost, and environmental concerns mainly resulted from the commonly used nonaqueous organic solvents severely hinder the practical application of DIBs. Herein, a hybrid aqueous/nonaqueous water-in-bisalt electrolyte with both broad electrochemical stability window and excellent safety performance is developed. The lithium-based DIB assembled using KS6 graphite and niobium pentoxide as the active materials in the cathode and anode exhibits good comprehensive performance including capacity, cycling stability, rate performance, and medium discharge voltage. Initial capacities of ≈47.6 and 29.6 mAh g −1 retention after 300 cycles can be delivered with a medium discharge voltage of around 2.2 V in the voltage window of 0-3.2 V at the current density of 200 mA g −1 . Good rate performance for the battery can be indicated by 29.7 mAh g −1 discharge capacity retention at 400 mA g −1 . It is noteworthy that the coulombic efficiency of the battery can reach as high as 93.9%, which is comparable to that of the corresponding DIBs using nonaqueous organic electrolytes.www.advancedsciencenews.com

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“…169 The low ionic conductivity is generally considered to be the main disadvantage of WIS electrolytes due to the strong coordination between Li + and water molecules, leading to unsatisfactory rate/power capabilities of CSs. [174][175][176][177] More recently, introducing extra ions with weak/ inert interactions into the WIS electrolytes has further boosted the salt/water ratio to an unprecedented level, and these waterin-bisalt electrolytes with upgraded operational potential still maintain competitive conductivities and viscosities in contrast to typical organic electrolytes (Fig. 12).…”

Section: Wis Electrolytesmentioning

confidence: 99%