Revealing Pseudocapacitive Mechanisms of Metal Dichalcogenide SnS<sub>2</sub>/Graphene‐CNT Aerogels for High‐Energy Na Hybrid Capacitors

Cui, Jiang; Yao, Shanshan; Lu, Ziheng; Huang, Jianqiu; Chong, Woon Gie; Ciucci, Francesco; Kim, Jang Kyo

doi:10.1002/aenm.201702488

Cited by 146 publications

(110 citation statements)

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“…42-1393 (space group of Pbnm (62)). The SSNS/CNT composite maintained a large specific surface area of 206.6 m 2 g −1 with abundant meso-and macropores [5,53] ( Figure S7 and Table S2, Supporting Information) which would facilitate easy access by the electrolyte and adsorption of polysulfides. The SSNS/CNT composite maintained a large specific surface area of 206.6 m 2 g −1 with abundant meso-and macropores [5,53] ( Figure S7 and Table S2, Supporting Information) which would facilitate easy access by the electrolyte and adsorption of polysulfides.…”

Section: Resultsmentioning

confidence: 99%

“…[1,2] Compared with other battery systems, [3][4][5][6][7][8][9][10] lithium sulfur batteries (LSBs) are considered an attractive choice alternative to LIBs as next-generation batteries thanks to their high theoretical energy density of 2567 Wh kg −1 and exceptional specific of Li 2 S x species. [1,2] Compared with other battery systems, [3][4][5][6][7][8][9][10] lithium sulfur batteries (LSBs) are considered an attractive choice alternative to LIBs as next-generation batteries thanks to their high theoretical energy density of 2567 Wh kg −1 and exceptional specific of Li 2 S x species.…”

Section: Introductionmentioning

confidence: 99%

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Novel 2D Sb₂S₃ Nanosheet/CNT Coupling Layer for Exceptional Polysulfide Recycling Performance

Yao

Cui

Huang

et al. 2018

Advanced Energy Materials

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capacity of 1675 mAh g −1 . [11][12][13] Despite their great promises, the commercialization of LSBs has been severely limited by several critical issues. They include: i) the inherently low electrical conductivity of S, i.e., 5 × 10 −30 S cm −1 at room temperature; ii) the formation of polysulfides leading to high overpotentials and low utilization of active materials [14] ; iii) the large volume expansion of ≈80% during lithiation, causing large mechanical stresses to build up on the cathode [15] ; and iv) the dissolution of intermediate polysulfide products in a shuttling effect, resulting in fast capacity degradation and poor Coulombic efficiencies. [16] To address the aforementioned issues, extensive research efforts have been devoted to developing rationally designed cathode materials, [17] protection of lithium anodes, [18] and modification of electrolytes [19][20][21] in LSBs. One effective strategy is to constrain S 8 or polysulfides within the cathode cavities so as to maintain the mechanical and electrical integrity of cathodes using unique structures, such as mesoporous carbon matrix/S, [22] activated porous carbon nanofiber/S, [14] activated carbon nanotube (CNT)/S, [23] hollow carbon nanosphere/S, [24] and metalorganic framework/S composites. [25] Although these porous hosts have been proven to suppress the shuttling effect, their large fractions of 30-60 wt% of the cathode inevitably reduce the energy densities of battery, compared with the neat S/ carbon black cathode, prompting urgent development of new strategies. More recently, separators coated with carbon materials, such as graphene oxide (GO) [26] and microporous carbon, [27] have been successfully introduced in LSBs to intercept the migration of polysulfides and reuse the adsorbed active material. [28] However, the interactions between the carbon materials and polysulfides are often too weak to effectively entrap and hold the polysulfides for their recycling. Therefore, understanding the interfacial interaction mechanisms and identifying appropriate coupling materials to enhance the interactions with polysulfides are required.Suitable coupling materials for polysulfide species should have two unique functional features. i) They should possess moderate binding energies with polysulfides in the range of 0.8-2.0 eV because too strong a binding energy over 2.0 eV softens the internal LiS bonds, leading to decomposition 2D layer-structured materials are considered a promising candidate as a coupling material in lithium sulfur batteries (LSBs) due to their high surfacevolume ratio and abundant active binding sites, which can efficiently mitigate shuttling of soluble polysulfides. Herein, an electrochemical Li intercalation and exfoliation strategy is used to prepare 2D Sb 2 S 3 nanosheets (SSNSs), which are incorporated onto a separator in LSBs as a new 2D coupling material for the first time. The cells containing a rationally designed separator which is coated with an SSNS/carbon nanotube (CNT) coupling layer deliver a much improved specific ca...

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel 2D Sb₂S₃ Nanosheet/CNT Coupling Layer for Exceptional Polysulfide Recycling Performance

Yao

Cui

Huang

et al. 2018

Advanced Energy Materials

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“…To clarify the chemical changes accompanying with the phase transformation during sodiation of BP, we conducted EELS analysis to determine the electronic states before and after sodiation. [45] The exceptionally low diffusion barrier of Na is possibly ascribed to the weak interactions between vdW bonded host crystal lattice and Na atoms. Additionally, the low-loss EELS profile of sodiated BP also contains the Na L-edge at 32.4 eV (marked by the red arrow in Figure 5a), which is invisible in pristine BP, confirming that Na ions are inserted www.advmat.de www.advancedsciencenews.com into the BP lattice.…”

Section: Doi: 101002/adma201904623mentioning

confidence: 99%

Orientation‐Dependent Intercalation Channels for Lithium and Sodium in Black Phosphorus

et al. 2019

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can also accommodate foreign species in its interlayer spacing via intercalation, and it has been found that alkali metal intercalated BP can lead to the tunable bandgap [8] and also exhibit superconductivity. [9] Moreover, the capability to intercalate alkali metals can make BP a potential electrochemical reservoir for energy storage, similar to the graphite used for rechargeable ion batteries. The theoretical specific ion storage capacity for Li-ion batteries (LIBs) and Na-ion batteries (NIBs) can be as high as 2596 mAh g −1 , which is almost one order of magnitude higher than the commercial graphite-based materials (372 mAh g −1 ), holding great promise for future applications ranging from portable electronic devices to large-scale electrical vehicles and power tools. [10][11][12][13][14][15][16] Doubtless, BP intercalation compounds are of both scientific and technological importance in multiple critical fields, but the fundamental understanding of the underlying intercalation mechanism remains largely elusive. To bridge up this knowledge gap, we present an in situ investigation on the intercalation of BP with both lithium and sodium ions.The intercalation of alkali elements has been extensively studied in rechargeable battery systems, where the alkali ions can be intercalated into the host materials via electrochemical reactions. Specifically, a great effort has been devoted to the intercalation of lithium and sodium in a large variety of 2D materials, including graphite, [17,18] borophane, [19] transition metal dichalcogenides, [20][21][22][23] transition metal carbides/carbonitrides, [24,25] and tin-based compounds, [26][27][28] which have larger interlayer spacing bonded by vdW interaction to offer sufficient ionic transport pathway. Orthorhombic BP is the most thermodynamically stable structure compared to other two allotropes of white phosphorus and red phosphorus, [29,30] and has wide spacing between the 2D layers to allow the intercalation of Li and Na ions. Recently, the electrochemical intercalation behaviors of BP have been reported using in situ transmission electron microscopy (TEM) techniques. It is found that the alkali ions would intercalate into the layered host framework and then form alloying compounds with P with anisotropic volume expansion and amorphization, which has been verified in lithiation [31] and sodiation, [32] respectively. Besides, the sodium-ion transport was suggested to be anisotropic and could cause atomic stack reordering upon slight intercalation. [33,34] Although these early studies have depicted the changes in morphology and volume Black phosphorus (BP) with unique 2D structure enables the intercalation of foreign elements or molecules, which makes BP directly relevant to high-capacity rechargeable batteries and also opens a promising strategy for tunable electronic transport and superconductivity. However, the underlying intercalation mechanism is not fully understood. Here, a comparative investigation on the electrochemically driven intercalation of lithium and sodiu...

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“…The HNO 3 treatment of PCNFs simultaneously removed the Fe 3 C nanoparticles and oxidized the PCNF surface, as evidenced by the increased intensity of oxygen peak in the X-ray photoelectron spectroscopy (XPS) spectrum ( Figure S4, Supporting Information) and the larger weight loss of PCNF-1.5-HNO 3 than PCNF-1.5-HCl by the thermogravimetric analysis (TGA) ( Figure S5, Supporting Information) due to the removal of oxygenated functional groups. [35] The peak located at 285.5 eV is attributed to the photoelectron of hydroxyl groups, epoxy groups, and N-doping due to the high N content in the PAN precursor [36,37] while the broad peak centered at 288.6 eV represents carboxyl groups in PCNFs. Figure 2c presents the deconvoluted C1s spectra, where the contents of various oxygenated groups were quantitatively determined and the results are plotted in Figure 2d.…”

Section: Fabrication and Characterization Of Porous Carbon Nanofibersmentioning

confidence: 99%

Correlation between Li Plating Behavior and Surface Characteristics of Carbon Matrix toward Stable Li Metal Anodes

Cui

Yao

Ihsan‐Ul‐Haq

et al. 2018

Advanced Energy Materials

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anodes. These new anodes promise an almost 100% increase in practical energy density compared to those of conventional LIB counterparts. [3][4][5][6][7][8][9] While developing cathodes for the next-generation batteries has made a significant progress, relatively fewer research efforts have thus far been devoted to Li metal anodes because of the formation of Li dendrites which is considered a critical drawback instigating devastating safety issues of batteries. [10] Along with recent studies on Li plating behaviors, there have been renewed interests in developing Li metal anodes. [11][12][13] In particular, the dendrite-free Li metal anode was made possible by rationally designing the electrolyte composition and electrode morphologies. [14,15] Nevertheless, the current Li metal anodes are far from being viable because of several reasons. Namely, (1) the dendritic Li emerges when the current density raises above the percolation value; (2) the Coulombic efficiencies (CEs) of Li metal anodes are too low to maintain good cyclic stability of batteries; and (3) the design of Li metal anodes is still inadequate, making it difficult to integrate into the existing LIB configurations, such as pouch and cylindrical cells. [12] Most of the strategies currently exercised for dendrite-free Li metal anodes usually fail to resolve all the above mentioned issues. For example, the all-solid-state Li-metal battery requires certain prestress to reduce the interfacial resistance between the solid-state electrolyte and the electrode, but such a prestress is difficult to apply on pouch cells. [16,17] The feasibility of artificial solid electrolyte interphase (SEI) protection on Li foil remains doubtful because the Li foil alone cannot be used as current collector in practical cells due to its hostless nature and huge volume changes during the repeated cycles. [11,18] Among all potential strategies, the incorporation of conductive substrates to function as both the Li host and current collector is considered an ideal approach for further development of practical Li metal anodes. [19] The growth of Li dendrites at high current densities was mitigated by means of reduced local current densities using conductive substrates. [12] Moreover, the conductive substrates also functioned as the current collector, which is compatible with the existing LIB configurations. While copper has been widely studied as the matrix material for hosting Li metal, carbon is considered a more promising candidate than copper Carbonaceous materials are widely employed to host Li for stable and safe Li metal batteries while relatively little effort is devoted to tailoring the surface properties of carbon to facilitate uniform Li plating. Herein, the correlation between Li plating behavior and the surface characteristics of electrospun porous carbon nanofibers (PCNFs) is systemically elucidated through experiments and theoretical calculations. It is revealed that the neat carbon surface suffers from severe lattice mismatch with Li metal, hindering uniform Li plating....

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Revealing Pseudocapacitive Mechanisms of Metal Dichalcogenide SnS₂/Graphene‐CNT Aerogels for High‐Energy Na Hybrid Capacitors

Cited by 146 publications

References 45 publications

Novel 2D Sb₂S₃ Nanosheet/CNT Coupling Layer for Exceptional Polysulfide Recycling Performance

Novel 2D Sb₂S₃ Nanosheet/CNT Coupling Layer for Exceptional Polysulfide Recycling Performance

Orientation‐Dependent Intercalation Channels for Lithium and Sodium in Black Phosphorus

Correlation between Li Plating Behavior and Surface Characteristics of Carbon Matrix toward Stable Li Metal Anodes

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Revealing Pseudocapacitive Mechanisms of Metal Dichalcogenide SnS2/Graphene‐CNT Aerogels for High‐Energy Na Hybrid Capacitors

Cited by 146 publications

References 45 publications

Novel 2D Sb2S3 Nanosheet/CNT Coupling Layer for Exceptional Polysulfide Recycling Performance

Novel 2D Sb2S3 Nanosheet/CNT Coupling Layer for Exceptional Polysulfide Recycling Performance

Orientation‐Dependent Intercalation Channels for Lithium and Sodium in Black Phosphorus

Correlation between Li Plating Behavior and Surface Characteristics of Carbon Matrix toward Stable Li Metal Anodes

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Revealing Pseudocapacitive Mechanisms of Metal Dichalcogenide SnS₂/Graphene‐CNT Aerogels for High‐Energy Na Hybrid Capacitors

Novel 2D Sb₂S₃ Nanosheet/CNT Coupling Layer for Exceptional Polysulfide Recycling Performance

Novel 2D Sb₂S₃ Nanosheet/CNT Coupling Layer for Exceptional Polysulfide Recycling Performance