Modifying Current Collectors to Produce High Volumetric Energy Density and Power Density Storage Devices

Khani, Hadi; Dowell, Timothy J.; Wipf, David O.

doi:10.1021/acsami.8b03606

Cited by 17 publications

(13 citation statements)

References 82 publications

(143 reference statements)

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“…Figure 4a presents CV curves of the WIPS-FME||AC-FME hybrid supercapacitor at different scan rates from 5 to 50 mV s −1 with a potential window from 0.0 to 1.5 V. An obvious redox peak can be clearly observed in the curves, which was contributed by the battery behavior of Ni(OH) 2 in hybrid supercapacitors. 34,35 Figure 4b exhibits the GCD curves at different current densities of 0.5−5.0 A g −1 within the same potential range as in the CV measurement. The corresponding specific capacitances calculated according to the discharge curve of GCD curves are shown in Table S4, and the highest specific capacitance of the device reached 69.57 F g −1 at a current density of 0.5 A g −1 .…”

Section: ■ Results and Discussionmentioning

confidence: 97%

Transferring Electrochemically Active Nanomaterials into a Flexible Membrane Electrode via Slow Phase Separation Method Induced by Water Vapor

Dong

Niu

et al. 2019

ACS Sustainable Chem. Eng.

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A nickel hydroxide flexible membrane electrode (Ni(OH) 2 -FME) is prepared by coagulation bath (water) directly induced phase inversion (WIPS-FME), and watervapor-induced phase inversion (VIPS-FME) methods, separately. Interestingly, a symmetrical structure of section morphology, surface porosity, and electrolyte-affinity characteristics of the flexible membrane are obtained by VIPS technology. The effects of relative humidity, exposure time, and temperatures of the phase inversion environment on the electrochemical performance and structure of VIPS are investigated. The specific capacitance of VIPS-FME reaches 2154.29 F g −1 at a current density of 1 A g −1 , which is better than WIPS-FME (1801.14 F g −1 ). Furthermore, a hybrid supercapacitor made by employing the VIPS-FME as the positive electrode and the active carbon flexible membrane (AC-FME) as the negative electrode exhibits a high specific capacitance of 96.03 F g −1 at 1 A g −1 , a maximum energy density of 30.01 W h kg −1 , and maximum power density of 3750.95 W kg −1 with the energy density of 16.4 W h kg −1 .

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Section: ■ Results and Discussionmentioning

confidence: 97%

Transferring Electrochemically Active Nanomaterials into a Flexible Membrane Electrode via Slow Phase Separation Method Induced by Water Vapor

Dong

Niu

et al. 2019

ACS Sustainable Chem. Eng.

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“…[38,39] Nevertheless, the increase in capacitance is still far from enabling the carbon material-based supercapacitors to approach the energy density of rechargeable batteries. [40,41] Different from carbon materials that store charges through electric doublelayer mechanism, pseudocapacitive materials can store more charges through the highly reversible redox reactions occurring at the surface of pseudocapacitive materials. [42,43] The faradaic contributions could substantially increase the resulting capacitance, and finally enable the achievement of greater energy density.…”

Section: Introductionmentioning

confidence: 99%

“…For example, owing to the natural properties of the heteroatom‐enriched resource such as N, O, P, S, and B, various biomasses have been transformed into heteroatom‐enriched carbon with different porosities, surface properties, and morphologies through different carbonization methods, and these heteroatom‐doped biomass‐derived carbons have shown enhanced specific capacitance with good conductivity and cycling stability . Nevertheless, the increase in capacitance is still far from enabling the carbon material‐based supercapacitors to approach the energy density of rechargeable batteries . Different from carbon materials that store charges through electric double‐layer mechanism, pseudocapacitive materials can store more charges through the highly reversible redox reactions occurring at the surface of pseudocapacitive materials .…”

Section: Introductionmentioning

confidence: 99%

In Situ Encapsulation of Iron Complex Nanoparticles into Biomass‐Derived Heteroatom‐Enriched Carbon Nanotubes for High‐Performance Supercapacitors

Zhang

Zhao

et al. 2018

Advanced Energy Materials

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continuous increase in energy production from sustainable and renewable resources, there is an ever increasing research effort toward highly efficient storing and delivering energy in the form of either electricity or chemical fuel. [1][2][3][4][5][6][7] Among various electricity storage technologies, supercapacitors are the highly desirable one to store electricity in an electrochemical way attributing to their high power capability, fast charge/discharge processes, and extraordinary cycle stability, making them probably the most promising candidates for the next generation of energy storage devices. [8][9][10][11][12] However, when comparing with the rechargeable batteries, one of the key issues of supercapacitors is their lower energy density that severely limits their extended applications. [13] Therefore, considerable research efforts have been devoted to improving the energy density of supercapacitors through either materials engineering or electrode nanostructuring strategies. [14][15][16][17] Carbon materials have been widely studied as electroactive materials for supercapacitors. Unfortunately, they generally suffer from the low energy density due to their limited capacitance arising from the energy storage via the ionic adsorption at the interfaces between carbon materials and electrolyte to form electric double layer. [18][19][20][21][22][23][24] Considering the surface-dependent energy storage mechanism, increasing surface area is believed as an efficient strategy to improve the capacitance of carbon materials. [25][26][27][28] Nanostructured carbon materials such as carbon nanotubes and graphene provide high specific surface area offering opportunities to store more charges, but it is still not enough to realize significant improvement in energy density of supercapacitors based on carbon materials. [29][30][31] An alternative strategy for further enhancing the specific capacitance of nanostructured carbon materials has been developed through incorporating heteroatoms into the carbon framework. [32][33][34][35] The incorporated heteroatoms could provide extra pseudocapacitive contributions from the fast faradic reactions between the heteroatom containing functional groups and the electrolyte ions, and sometimes the heteroatoms doping could optimize the surface wettability and the electronic conductivity of carbonThe capacitive performance of carbon materials could be enhanced by means of increasing the number of active sites, the surface area, and the porosity as well as through incorporating heteroatoms into the carbon framework. However, the charge storage through electric double-layer mechanism results in limited increase in capacitance of modified carbon materials. Herein, a simple and straightforward strategy is introduced for in situ synthesizing iron complex (FeX, which X includes O, C, and P) nanoparticles encapsulated into biomass-derived N, P-codoped carbon nanotubes (NPCNTs), using a natural resource, egg yolk, as heteroatom-enriched carbon sources and potassium ferricyanide as the precurso...

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“…Due to the features of abundance and the low cost of sodium resources, energy storage devices based on sodium ions have become a promising alternative to lithium-ion-based systems. − It is well-understood that rapid and reversible intercalation/deintercalation of sodium ions is more difficult in graphite than that of lithium ions, owing to the larger ion radius of Na + (0.102 nm of Na + vs 0.076 nm of Li + ). Therefore, an extremely low specific capacity of 35 mA h g –1 is observed when graphite is employed as an electrode for sodium ion batteries. , Until now, all kinds of alternative electrode materials for sodium ion batteries have been explored, including disordered carbon, graphene, heteroatom-doped carbon, , hard carbon, , metal oxide/sulfide, − metal/alloys, , organic compounds, , and so forth, which are intended to improve the kinetics of sodium storage.…”

Section: Introductionmentioning

confidence: 99%

“…Among the reported anode materials, electrodes based on carbon demonstrate the most promising potential as sodium ion battery anodes for commercialization. In order to improve the electrochemical performance of carbon materials in sodium ion batteries, several effective approaches have been carried out, − ,− i.e., designing 2D porous carbons and introducing heteroatoms, especially nitrogen, into the carbon framework. The 2D porous structure can reduce the diffusion distance of sodium ions and favor the reversible Na + adsorption/desorption on the surface, leading to the improved rate performance.…”

Section: Introductionmentioning

confidence: 99%

Nitrate Salt Assisted Fabrication of Highly N-Doped Carbons for High-Performance Sodium Ion Capacitors

Dong

Wang

Liu

et al. 2018

ACS Appl. Energy Mater.

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Hybrid sodium ion capacitors have been considered promising energy storage devices with superior energy and power performances by combining the advantages of batteries and supercapacitors. However, it is desirable to design anode materials with large specific capacity and excellent rate performance. Herein, we provide a largescalable process to create the highly N-doped carbons by employing k-carrageenan as precursor and alkali metal nitrate as activating agent and dopant. Remarkably, the nitrate salt assisted synthesis process leads to a high nitrogen content of 8.6−12.6 at. % in the carbon framework. When applied as an anode for a sodium ion battery, the carbon delivers a high reversible capacity of 419 mA h g −1 at 50 mA g −1 . The kinetics analysis manifests that the capacity contribution is mainly from capacitive storage, resulting in an excellent rate performance, e.g., 131 mA h g −1 at 10 A g −1 . Benefiting from the rational design of the carbon anode, the optimized sodium ion capacitor exhibits a large energy density of 110.8 W h kg −1 and retains 85% of its initial capacity after 10 000 cycles. This work provides an effective way to fabricate highly N-doped carbons for advanced energy storage devices.

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Modifying Current Collectors to Produce High Volumetric Energy Density and Power Density Storage Devices

Cited by 17 publications

References 82 publications

Transferring Electrochemically Active Nanomaterials into a Flexible Membrane Electrode via Slow Phase Separation Method Induced by Water Vapor

Transferring Electrochemically Active Nanomaterials into a Flexible Membrane Electrode via Slow Phase Separation Method Induced by Water Vapor

In Situ Encapsulation of Iron Complex Nanoparticles into Biomass‐Derived Heteroatom‐Enriched Carbon Nanotubes for High‐Performance Supercapacitors

Nitrate Salt Assisted Fabrication of Highly N-Doped Carbons for High-Performance Sodium Ion Capacitors

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