Quantifying the Volumetric Performance Metrics of Supercapacitors

Li, Huan; Qi, Changsheng; Tao, Ying; Liu, Huabo; Wang, Dawei; Li, Feng; Yang, Quan‐Hong; Cheng, Hui‐Ming

doi:10.1002/aenm.201900079

Cited by 103 publications

(67 citation statements)

References 74 publications

(91 reference statements)

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“…Readers are encouraged to follow the general guidelines for supercapacitor research, such as reporting normalized capacitance minimum at the scan rate of 10 mV s −1 or the current density of 2 A g −1 , providing information on Self-discharge or leakage current, from relevant references. [47,90,[285][286][287][288] Below we formulate and refine the following general guidelines related to the supercapacitor research involving doping processes in electrode preparation.…”

Section: Key Features and Guidelinesmentioning

confidence: 99%

Heteroatom‐Doped and Oxygen‐Functionalized Nanocarbons for High‐Performance Supercapacitors

Ghosh

Barg

Jeong

et al. 2020

Advanced Energy Materials

434

237

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Electrochemical capacitors (best known as supercapacitors) are high‐performance energy storage devices featuring higher capacity than conventional capacitors and higher power densities than batteries, and are among the key enabling technologies of the clean energy future. This review focuses on performance enhancement of carbon‐based supercapacitors by doping other elements (heteroatoms) into the nanostructured carbon electrodes. The nanocarbon materials currently exist in all dimensionalities (from 0D quantum dots to 3D bulk materials) and show good stability and other properties in diverse electrode architectures. However, relatively low energy density and high manufacturing cost impede widespread commercial applications of nanocarbon‐based supercapacitors. Heteroatom doping into the carbon matrix is one of the most promising and versatile ways to enhance the device performance, yet the mechanisms of the doping effects still remain poorly understood. Here the effects of heteroatom doping by boron, nitrogen, sulfur, phosphorus, fluorine, chlorine, silicon, and functionalizing with oxygen on the elemental composition, structure, property, and performance relationships of nanocarbon electrodes are critically examined. The limitations of doping approaches are further discussed and guidelines for reporting the performance of heteroatom doped nanocarbon electrode‐based electrochemical capacitors are proposed. The current challenges and promising future directions for clean energy applications are discussed as well.

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Section: Key Features and Guidelinesmentioning

confidence: 99%

Heteroatom‐Doped and Oxygen‐Functionalized Nanocarbons for High‐Performance Supercapacitors

Ghosh

Barg

Jeong

et al. 2020

Advanced Energy Materials

434

237

View full text Add to dashboard Cite

show abstract

“…On the other hand, as mentioned above, high volumetric capacitance of SCs is essentially important for their practical applications. [16,48,93] Compared with ACs, most of graphene-based materials display low packing density, which significantly deteriorates the volumetric performance of SCs. To this end, tremendous research efforts have focused on the densification of graphene-based materials.…”

Section: Strategies For High Gravimetric and Volumetric Capacitancementioning

confidence: 99%

Perspective on High‐Energy Carbon‐Based Supercapacitors

Dou

Park

2020

Energy & Environ Materials

154

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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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“…[9] For the host design, unimpeded ion transport and high electrical conductivity are favorable to achieve a high-rate stability, and a high specific surface area contributes to a high areal capacity. [10] In this regard, Ti 3 C 2 T x -based MXene is a good choice due to its excellent conductivity and high specific surface area. [11] More importantly, the amounts of functional groups on the Ti 3 C 2 T x are expected to guide uniform Li nucleation and regulate the subsequent Li growth structure.…”

Section: Introductionmentioning

confidence: 99%

Layered MXene Protected Lithium Metal Anode as an Efficient Polysulfide Blocker for Lithium‐Sulfur Batteries

Han

et al. 2020

Batteries & Supercaps

Self Cite

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The shuttle effect of lithium polysulfides (LiPSs) from sulfur cathode to lithium (Li) anode is one of the main obstacles for lithium‐sulfur (Li−S) batteries. The severe corrosion of Li metal anode by the dissolved LiPSs bottlenecks the efficient operation of Li−S batteries, however, the anode part has not been received much attention compared to those extensive efforts related to the cathode designs. Herein, we show that the interface between Ti3C2Tx (T=−OH, −F)‐based MXene and reduced graphene oxide (rGO) is able to guide uniform Li nucleation, promoting highly reversible and dendrite‐free Li plating/stripping. Such the Li anode demonstrates excellent cycling stability for more than 1000 hours even under ultra‐high rate (10 mA cm−2) and high areal capacity (3 mAh cm−2). More importantly, the well‐designed 2D layered structure by coupling the Ti3C2Tx with a graphene scaffold, is highly efficient to block the shuttled polysulfides and inhibit the corrosion of the lithium metal anode. As a result, the Li−S full battery exhibits a stable cycling stability with a high Coulombic efficiency of 99.8 % over 300 cycles. This work suggests the design strategy of Li metal anode especially targeting at the sulfur cathode, and we hope it can provide valuable inspirations for the future design of Li metal anodes for more practical Li−S batteries.

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Quantifying the Volumetric Performance Metrics of Supercapacitors

Cited by 103 publications

References 74 publications

Heteroatom‐Doped and Oxygen‐Functionalized Nanocarbons for High‐Performance Supercapacitors

Heteroatom‐Doped and Oxygen‐Functionalized Nanocarbons for High‐Performance Supercapacitors

Perspective on High‐Energy Carbon‐Based Supercapacitors

Layered MXene Protected Lithium Metal Anode as an Efficient Polysulfide Blocker for Lithium‐Sulfur Batteries

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