Stringed “tube on cube” nanohybrids as compact cathode matrix for high-loading and lean-electrolyte lithium–sulfur batteries

Li, Gaoran; Lei, Wen; Luo, Dan; Deng, Yaping; Deng, Zhongmin; Wang, Deli; Yu, Aiping; Chen, Zhongwei

doi:10.1039/c8ee01377b

Cited by 265 publications

(193 citation statements)

References 41 publications

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“…These work have comprehensively achieved all practical cell‐assembly conditions, with sulfur loadings of over 5 mg cm −2 , sulfur contents of over 60 wt%, and low electrolyte/sulfur ratios of less than 11 µL mg −1 . Specifically, these promising studies have attained better sulfur loading and electrolyte/sulfur ratios of over 8 mg cm −2 and less than 4.5 µL mg −1 , respectively, using nanocomposites with a hierarchically structured sulfur host and a cross‐linked binder, a nanocomposite with a micro‐nanostructured sulfur host, a nanocomposite made of a sulfur host featuring large intrinsic macropores, and a ternary hierarchical nanocomposite with a fibrous carbon skeleton, porous carbon cube, and carbon nanotubes . However, these cases with sulfur‐based nanocomposites coated on aluminum‐foil current collectors commonly show a reduced cycle life of 10–20 cycles …”

Section: Lithium–sulfur Cellsmentioning

confidence: 99%

“…Lithium–sulfur cells are usually charged to 2.5–3.0 V. Similar to what happens in the discharge cutoff voltage setting, the charge cutoff voltage also reconciles between a fully charged state at 3.0 V, achieving a complete oxidation of the sulfur species, and a moderate state at 2.5–2.8 V, helping the cells maintain good cycle stability . Charging a cell to 2.8 V is commonly used in lithium–sulfur studies.…”

Section: Lithium–sulfur Cellsmentioning

confidence: 99%

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Current Status and Future Prospects of Metal–Sulfur Batteries

Chung¹,

Manthiram²

2019

Advanced Materials

496

415

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that makes use of intercalation materials as the electrodes (Figure 1), applications involving electric vehicles and smart grids may require rechargeable batteries with new battery chemistries that can generate even higher energy densities for longer driving ranges and higher energy-storage capabilities. [6][7][8] Additionally, the lithiated transition-metal oxides used in commercial lithium-ion battery cathodes tend to be expensive, scarce, or toxic to the environment. Thus, it is desirable to explore new electrode materials that are naturally abundant (and therefore less expensive) as well as environmentally compatible in order to successfully enter the future battery markets. [6,[8][9][10][11] This driving force has promoted the development of batteries with conversionreaction electrodes, in which reversible electrochemical reactions take place and new chemical compounds form during the cycling of the battery. Naturally abundant materials, such as sulfur for the cathode, can be applied as electrodes. Different metallic anodes have shown great potential in coupling with sulfur cathode to generate a high energy density, including lithium metal [3,10,[12][13][14][15][16][17]31] as well as other alkali [18][19][20][21][22][23][24]31] and high-valent metals. [18,[25][26][27][28][29][30][31] As a next-generation energy-storage technology beyond lithium-ion batteries, lithium-sulfur batteries are the most promising low-cost, high-capacity energy-storage device available due to their high charge-storage capacity, low cost, and the wide availability of sulfur. [32][33][34][35] The electrochemical reactions of lithium-sulfur batteries involve reversible conversions between sulfur (S 8 ), lithium polysulfides (Li 2 S x , x = 4-8), and lithium sulfides (Li 2 S 2 and Li 2 S). [33][34][35][36] The conversions between sulfur and lithium polysulfides and lithium sulfides involve phase changes between liquid-state polysulfides and solid-state sulfur and sulfides. [35][36][37][38][39][40] Thus, the conversion reaction of lithium-sulfur battery chemistry has no restriction in maintaining the initial crystal chemistry of the electrode during electrochemical cycling. [39][40][41][42] Therefore, a full twoelectron redox reaction per sulfur atom can occur in a manner that is both reversible and stable, increasing the chargestorage capacity drastically as compared to the currently used insertion-reaction oxide cathodes. [7,[39][40][41][42] As a result, sulfur cathodes possess a high theoretical charge-storage capacity of 1672 mA h g −1 , which is the highest value among solid-state Lithium-sulfur batteries are a major focus of academic and industrial energystorage research due to their high theoretical energy density and the use of low-cost materials. The high energy density results from the conversion mechanism that lithium-sulfur cells utilize. The sulfur cathode, being naturally abundant and environmentally friendly, makes lithium-sulfur batteries a potential next-generation energy-storage technology. The current state of the rese...

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Section: Lithium–sulfur Cellsmentioning

confidence: 99%

Section: Lithium–sulfur Cellsmentioning

confidence: 99%

Current Status and Future Prospects of Metal–Sulfur Batteries

Chung¹,

Manthiram²

2019

Advanced Materials

496

415

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“…A complete and detailed coverage of all the preparation routes, properties, and potential of MOF-nanofiber derivatives in energy applications is exceeding the scope of this review. [99] Copyright 2018, Royal Society of Chemistry. [60] Wang et al [96] proposed the fabrication of nanoporous carbon nanofibers (NPFCs) by the heat treatment of ZIF-8/ PAN nanofibers in N 2 atmosphere for the use in supercapacitors (Figure 6a).…”

Section: Preparation Of the Derivatives Of Mof Nanofibersmentioning

confidence: 99%

“…For this purpose, a layer of a bimetallic MOF was grown on PAN nanofibers, containing metal acetates Zn(Ac) 2 and Co(Ac) 2 . Li et al [99] developed a porous conductive nanofiber by MOF-nanofiber carbonization and post-treatment for similar application in Li-S batteries. The resulting N-doped porous CHT paper yielded in an outstanding cycling life (10 000 cycles), with high-rate capabilities of Na + intercalation and deintercalation and no decline in capacity.…”

Section: Preparation Of the Derivatives Of Mof Nanofibersmentioning

confidence: 99%

Electrospinning of Metal–Organic Frameworks for Energy and Environmental Applications

2019

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organic linkers with a periodic, nanoscaled structure and ultrahigh surface areas. With their tunable pore/cage sizes, flexible skeleton, and large surface-to-volume ratio, [13][14][15][16][17][18][19] MOFs have a large potential for a wide range of applications, including gas storage and separation, rechargeable batteries, supercapacitors, solar cells, nanoreactors, heterogeneous catalysis, or drug delivery. [20][21][22][23][24][25][26][27] Recently, significant efforts have been devoted to the design and synthesis of new MOFs structures and the investigation of their physical or chemical properties. MOFs are generally prepared as bulk form through traditional hydrothermal or solvothermal synthesis. [28][29][30][31] In order to expand the application range, suitable pathways for the structuring of MOF powders into a functional architecture or devices are highly desirable.Currently, intensive efforts are focusing on the structuring of MOFs at the mesoscopic/macroscopic scale for the use as coatings, membranes, or sophisticated architectures in specific devices and applications. [32][33][34][35] A major difference in the structuring of MOFs into complex shapes compared to inorganic microporous materials, such as zeolites or silica, is the fact that most inorganic binders cannot be used for MOFs as these binders usually require heat treatment. The intrinsic fragility of MOFs needs to be considered which is related to the inorganic/organic hybrid character of this class of materials and the resulting limited thermal and mechanical stability. Alternatively, a more effective way to structure MOFs is the combination with polymer materials. The polymer which acts as a binder improves the mechanical flexibility and ensures chemical stability. Numerous methods have been developed for structuring MOF-polymer compositions including hard or soft templates, spin-or dip-coating, spray-drying, printing, or lithography approaches. [36][37][38] The integration of MOFs into a polymer matrix can result in poor MOF-polymer dispersion and compatibility issues owing to the different physical and chemical properties for the two kinds of materials and this is a challenge in some applications, e.g., in MOF-based mixed matrix membranes for gas separation. [39][40][41][42] The poor interfacial compatibility would lead to agglomeration of MOF particles, causing the formation of nonselective voids between the MOFs particles and the polymer.Electrospinning is a fabrication method to produce continuous ultrafine fibers with diameters in the range of a few tens of nanometers to a few micrometers in the form of nonwoven mats, yarns, etc. The mechanism of electrospinning is based Herein, recent developments of metal-organic frameworks (MOFs) structured into nanofibers by electrospinning are summarized, including the fabrication, post-treatment via pyrolysis, properties, and use of the resulting MOF nanofiber architectures. The fabrication and post-treatment of the MOF nanofiber architectures are described systematically by two routes: i) the dire...

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“…[13][14][15] The pyrolysis Zeolitic Imidazole Framework (ZIF) with natural N-doping structure and abundant metal particles can accelerate the redox kinetics and benefit the polysulfide adsorption for the advance LiÀ S batteries. [16] For instance, Li et al [17] synthesized a layered conductive fabric by electrospinning and chemical vapor deposition process. Improved the electrochemical performance when used as sulfur electrodes.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical Rambutan‐Like CNTs‐Assembled N−Co−C@rGO Composite as Sulfur Immobilizer for High‐Performance Lithium‐Sulfur Batteries

et al. 2019

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The design of efficient sulfur‐host materials is of great significance to enhance the conductivity of lithium‐sulfur (Li−S) batteries and inhibit the shuttle effect of polysulfides. Hence, a nitrogen and cobalt co‐doped graphitized carbon (N−Co−C)‐coated reduced graphene oxide (rGO) with plenty of carbon nanotubes (CNTs) was rationally designed. The composite had abundant multiple adsorptive and electrocatalytic sites to provide strong chemical trapping for polysulfides and simultaneously propel their electrochemical kinetics. The densely grafted small‐diameter CNTs could shorten the ion‐diffusion pathways and maintain the structural stability of the electrode materials. Meanwhile, abundant pore structures could provide enough volume for sulfur impregnation and physical adsorption of polysulfides. Owing to these favorable features, the as‐prepared rambutan‐like S/N−Co−C@rGO‐CNTs (S/NCoC@G‐CNTs) composite demonstrated excellent electrochemical performance with a high initial specific capacity of 1225.8 mAh g−1 at 0.2 C and high rate performance of 632.5 mAh g−1 at 5.0 C and possessed decent areal capacity under high raised sulfur loading of up to 5 mg cm−2.

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Stringed “tube on cube” nanohybrids as compact cathode matrix for high-loading and lean-electrolyte lithium–sulfur batteries

Abstract: Stringed “tube on cube” hybrid architecture is developed for high-energy-density lithium–sulfur batteries with high sulfur loading and lean electrolyte.

Cited by 265 publications

References 41 publications

Current Status and Future Prospects of Metal–Sulfur Batteries

Current Status and Future Prospects of Metal–Sulfur Batteries

Electrospinning of Metal–Organic Frameworks for Energy and Environmental Applications

Hierarchical Rambutan‐Like CNTs‐Assembled N−Co−C@rGO Composite as Sulfur Immobilizer for High‐Performance Lithium‐Sulfur Batteries

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