Graphene-based materials for high-voltage and high-energy asymmetric supercapacitors

Zheng, Shuilin; Wu, Zhong‐Shuai; Wang, Sen; Xiao, Han; Zhou, Feng; Sun, Cheng; Bao, Xinhe; Cheng, Hui‐Ming

doi:10.1016/j.ensm.2016.10.003

Cited by 272 publications

(114 citation statements)

References 208 publications

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“…Performance enhancement was furthera chieved either through adding redox speciess uch as 4-hydroxy-2,2,6,6-tetramethylpiperidin-1oxyl (4hT) into the electrolytes (110 Wh kg À1 for a2 0m [BMIm]Cl/H 2 Ow ith 0.1 m 4hT) or by pre-inserting ClO 4 À anions into the graphene platelets. Besides the selection and optimization of electrode materials towards high availablesurface areas and porosities, [5][6][7][8][9][10] great efforts have been made to tailor the electrolyte formulation including the selection of types of solvents and electrolyte ions. [1,2] They exhibit excellent cyclingr eversibility,w ithoutc ausingi nherent structural changes in electrodes and electrolytes.…”

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confidence: 99%

High‐Voltage and Low‐Temperature Aqueous Supercapacitor Enabled by “Water‐in‐Imidazolium Chloride” Electrolytes

2018

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Symmetric aqueoush igh voltage supercapacitors up to 3V have been demonstrated using concentrated aqueous 1-butyl-3-methylimidazolium chloride ([BMIm]Cl), namely," water-inimidazolium chloride", as working electrolytes, andg raphene nanoplatelets-coated carbon paper as electrodes. Performance enhancement was furthera chieved either through adding redox speciess uch as 4-hydroxy-2,2,6,6-tetramethylpiperidin-1oxyl (4hT) into the electrolytes (110 Wh kg À1 for a2 0m [BMIm]Cl/H 2 Ow ith 0.1 m 4hT) or by pre-inserting ClO 4 À anions into the graphene platelets. Moreover,t he newly studied aqueous electrolytes allow low-temperature operation at À20 8C and even at À32 8C, retaining competitive energy storage capability (maximum energy densities of 36 and 21 Wh kg À1 ,r espectively).With ultrafastc harge-discharge rates through building up electricald ouble layers on porous electrodes with at ypical timescale of seconds, supercapacitors can generally realize high power densities of about 10 kW kg À1 and energy densities of about 5Whkg À1 . [1,2] They exhibit excellent cyclingr eversibility,w ithoutc ausingi nherent structural changes in electrodes and electrolytes. Thus,s upercapacitors are promising for rapid response in peak shavinga nd grid stabilization. [3,4] To facilitate their practical application,i ssues of low energy density,s afety, and high cost need to be solved. Besides the selection and optimization of electrode materials towards high availablesurface areas and porosities, [5][6][7][8][9][10] great efforts have been made to tailor the electrolyte formulation including the selection of types of solvents and electrolyte ions. [11][12][13] The amount of stored energy in supercapacitors can be increased by increasing the ion-accessible surfacea rea of the electrode materials. Another way to increase the energy density of supercapacitors is to increase the operating potential range of the system, as energy density is proportionaltot he square of the voltage.Organics olvents and room-temperature ionic liquidsa re commonlyu sed as workingm edia for high operating-voltage (> 2V)s upercapacitors. [14] However,t hey typically have poor ion conductivities, from about af ew mS cm À1 for ionic liquids to tens of mS cm À1 for conventionalo rganic electrolytes at room temperature. [15] By adding molecular solvents, such as water or acetonitrile, into ionic liquids, [16][17][18] the viscosity can be greatly reduced and the ion conductivity can be accordingly enhanced with as acrifice in the electrochemical stability window of the electrolytes. Water as an atural alternative to the flammable organic solvents or highly viscous room-temperaturei onic liquidsi si deal for use as aw orking medium for electrochemical devices with the merits of intrinsic safety and fast transport for ionic species. Aqueouse lectrolytes for supercapacitors couldenabletheir assembly and operation under atmosphericc onditions. However,i th as been al ongstanding challenge that water has an arrow electrochemical stability window (a sum of the thermo...

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High‐Voltage and Low‐Temperature Aqueous Supercapacitor Enabled by “Water‐in‐Imidazolium Chloride” Electrolytes

2018

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“…Recently, micro-supercapacitors (MSCs) with multiple compatible characteristics of lightweight, tailored size, robust mechanical flexibility, and ultrahigh power delivery have attracted tremendous attentions [6][7][8]. Despite dramatic developments in innovating nanostructured electrode materials and fabricating novel devices, there are still enormous challenges in realizing MSCs with high volumetric capacitance and energy density [9,10].…”

Section: Introductionmentioning

confidence: 99%

Mesoporous polypyrrole-based graphene nanosheets anchoring redox polyoxometalate for all-solid-state micro-supercapacitors with enhanced volumetric capacitance

et al. 2017

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Further, mPGM-MSCs disclosed robust mechanical flexibility with~96% of capacitance retention at a highly bending angle of 180°, and impressive parallel or serial interconnection for boosting capacitance or voltage output. As a consequence, our proposed strategy of filling the redox species into mesoporous graphene and other 2D nanosheets will open up new ways to manufacture high-compact and flexible energy storage devices ranging from supercapacitors to batteries.

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“…[2][3][4][5][6] On the other hand, hybrid supercapacitors (HSCs) deliver higher energy density than symmetric supercapacitors and larger power density than lithium ion batteries, originating from the extended voltage working windows (e.g., 1.5~2 V in aqueous electrolyte) of advanced asymmetric device geometry, efficiently combining the advantages of supercapacitive electrode with battery-like electrode into single device system. 7,8 Up to now, enormous advances have been made on the development of high-peformance electrodes in sandwich-like HSCs, such as positive electrodes of capacitive counterparts (e.g., active carbon (AC), 9 graphite, 10 and graphene 11 ), redox-active metal oxides/ hydroxides (e.g., MnO 2 16 ), electrically conducting polymers 17 and their hybrids, 18 and negative electrode materials covering all types of nanocarbons (AC, 19 porous carbon, 20 CNT, 21 , and metal nitrides (e.g., titanium nitride, 25 vanadium nitride (VN) 26 ). However, these state-of-the-art…”

Section: Introductionmentioning

confidence: 99%

“…Inkjet printing is a simple, cost-effective approach for micropatterns on the targeted substrates, but highly solution-processable ink of electrode material is a prerequisite. 7,30 Electrochemical deposition is efficiently scalable for fabricating PHMSs. However, the serious capacity degradation is not avoided during charge and discharge when the deposited electrodes become thicker.…”

Section: Introductionmentioning

confidence: 99%

All-solid-state high-energy planar hybrid micro-supercapacitors based on 2D VN nanosheets and Co(OH)2 nanoflowers

Wang

Zhou

et al. 2018

npj 2D Mater Appl

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Planar micro-supercapacitors are recognized as one of the most competitive on-chip power sources for integrated electronics. However, most reported symmetric micro-supercapacitors suffer from low energy density. Herein, we demonstrate the facile maskassisted fabrication of new-type all-solid-state planar hybrid micro-supercapacitors with high energy density, based on interdigital patterned films of porous vanadium nitride nanosheets as negative electrode and Co(OH) 2 nanoflowers as positive electrode. The resultant planar hybrid micro-supercapacitors display high areal capacitance of 21 mF cm −2 and volumetric capacitance of 39.7 F cm −3 at 0.2 mA cm −2 , and exhibit remarkable energy density of 12.4 mWh cm −3 and power density of 1750 mW cm −3 , based on the whole device, outperforming most reported planar hybrid micro-supercapacitors and planar asymmetric micro-supercapacitors. Moreover, all-solid-state planar hybrid micro-supercapacitors show excellent cyclability with 84% capacitance retention after 10000 cycles, and exceptionally mechanical flexibility. Therefore, our proposed strategy for the simplified construction of planar hybrid micro-supercapacitors will offer numerous opportunities of utilizing graphene and other 2D nanosheets for high-energy microscale supercapacitors for electronics.

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Graphene-based materials for high-voltage and high-energy asymmetric supercapacitors

Cited by 272 publications

References 208 publications

High‐Voltage and Low‐Temperature Aqueous Supercapacitor Enabled by “Water‐in‐Imidazolium Chloride” Electrolytes

High‐Voltage and Low‐Temperature Aqueous Supercapacitor Enabled by “Water‐in‐Imidazolium Chloride” Electrolytes

Mesoporous polypyrrole-based graphene nanosheets anchoring redox polyoxometalate for all-solid-state micro-supercapacitors with enhanced volumetric capacitance

All-solid-state high-energy planar hybrid micro-supercapacitors based on 2D VN nanosheets and Co(OH)2 nanoflowers

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