Tungsten Disulfide Catalysts Supported on a Carbon Cloth Interlayer for High Performance Li–S Battery

Self Cite

143

114

research stage because even state-of-theart Li-S cells do not meet the standards of all key aspects in battery operation; [1][2][3][4] although gravimetric energy density has proven to surpass those of existing lithium-ion batteries, cycle life, roundtrip efficiency, and rate performance are required to be further improved in order to be integrated with emerging battery applications such as electric vehicles and drones. [5,6] A variety of electrode structures, [7][8][9][10][11][12][13][14][15][16][17][18][19][20] electrolyte conditions, [21][22][23][24][25][26][27][28] and separator treatments [29][30][31][32][33][34] have been introduced to address the fatal capacity fading associated with polysulfide dissolution, electrode volume expansion, and poor conductivity of sulfur. Some representative electrode designs to avoid these fading mechanisms include encapsulating elemental sulfur (S) in conductive porous media or nanomaterial assemblies [35,36] or synthesizing sulfur-embedded polymers. [37][38][39][40][41][42] Both strategies have improved cyclability mainly by mitigating polysulfide dissolution. However, complete encapsulation remains a technical challenge for the former approach, where inevitable defects could lead to polysulfide dissolution especially Polysulfide dissolution into the electrolyte and poor electric conductivity of elemental sulfur are well-known origins for capacity fading in lithium-sulfur batteries. Various smart electrode designs have lately been introduced to avoid these fading mechanisms, most of which demonstrate significantly improved cycle life. Nevertheless, an in-depth understanding on the effect of sulfur microstructure and nanoscale electron transport near sulfur is currently lacking. In this study, the authors report an organized nanocomposite comprising linear sulfur chains and oleylamine-functionalized reduced graphene oxide (O-rGO) to achieve robust cycling performance (81.7% retention after 500 cycles) as well as to investigate the reaction mechanism in different regimes, i.e., S 8 dissolution, polysulfide conversion, and Li 2 S formation. In the nanocomposite, linear sulfur chains terminate with 1,3-diisopropyl benzene are covalently linked to O-rGO. The comparison with control samples that do not contain either the capping of sulfur chains or O-rGO reveals the synergistic interplay between both treatments, simultaneously unveiling the distinct roles of confined sulfur nanodomains and their adjoining electron pathways in different reaction regimes.

Section: Resultsmentioning

confidence: 99%

The Importance of Confined Sulfur Nanodomains and Adjoining Electron Conductive Pathways in Subreaction Regimes of Li‐S Batteries

Park

Kim

et al. 2017

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143

114

“…[50][51][52][53][54] However, both the nitrides and sulfides demonstrate a weaker adsorption ability which exerts an important influence on electrochemical performance in the adsorptioncatalysis synergy system. The high conductivity is the main advantage of nitrides as compared with sulfides, which can enable the fast electron transfer and thus improve the electrochemical utilization of active sulfur.…”

Section: Catalysis Superiority Synergymentioning

confidence: 99%

“…Typically, ZnS, [50] VS 2 , [51] Co 3 S 4 , [52] VS 4 , [53] and MoS 2 [54] are the most common components, which have been demonstrated with great potential in alleviating the LiPSs diffusion out of the sulfur hosts. Typically, ZnS, [50] VS 2 , [51] Co 3 S 4 , [52] VS 4 , [53] and MoS 2 [54] are the most common components, which have been demonstrated with great potential in alleviating the LiPSs diffusion out of the sulfur hosts.…”

Section: Catalysis Superiority Synergymentioning

confidence: 99%

Adsorption‐Catalysis Design in the Lithium‐Sulfur Battery

Zhang

Chen

Xue

et al. 2019

312

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Lithium‐sulfur (Li‐S) batteries are one of the most promising next‐generation energy‐storage systems. Nevertheless, the sluggish sulfur redox and shuttle effect in Li‐S batteries are the major obstacles to their commercial application. Previous investigations on adsorption for LiPSs have made great progress but cannot restrain the shuttle effect. Catalysts can enhance the reaction kinetics, and then alleviate the shuttle effect. The synergistic relationship between adsorption and catalysis has become the hotspot for research into suppressing the shuttle effect and improving battery performance. Herein, the adsorption‐catalysis synergy in Li‐S batteries is reviewed, the adsorption‐catalysis designs are divided into four categories: adsorption‐catalysis for LiPSs aggregation, polythionate or thiosulfate generation, and sulfur radical formation, as well as other adsorption‐catalysis. Then advanced strategies, future perspectives, and challenges are proposed to aim at long‐life and high‐efficiency Li‐S batteries.

“…[139] Yu et al reported hierarchical core-shell-like MnO 2 nanostructures decorated MnO 2 hexagonal nanoplate arrays uniformly grown on carbon cloth fibers using a novel one-step electrochemical deposition method. [140] Later, V 2 O 5 nanoparticles encapsulated in 3D networked porous carbon matrix, [141] needle-like Fe 3 O 4 and flake-like NiO, [142] layered tungsten disulfide (WS 2 ) [143] and cubic phase CoSe 2 , [144] have been also grown on carbon cloth. Recently, ternary transition metal oxides/sulfides have attracted significant research interest, due to their widely promising www.advancedsciencenews.com application in many fields.…”

Section: Template-assisted Approachmentioning

confidence: 99%

“…3D nitrogen-doped porous CNFs can be prepared using our CNF gel without adding any activation as the electrodes of supercapacitors, which exhibit hierarchical structure with reasonable distribution of mesopores and micropores. Compared to the carbon materials with single-sized pores, the [57][58][59][60][61][62][63][64]72] High surface areas; low volume density Thermal transformation approach CNF gels derived from thermal transformations of BC [16,70,85,86,[102][103][104][105][106][107][108][109][110][111][112][113] CVD technique 3D CNF/graphene networks [116] 3D CNF films Template-assisted approach Carbon cloth, carbon papers and carbon fiber felt-based 3D CNF films [128][129][130][131][132][133][134][135][136][137][139][140][141][142][143][144][145][146][147]…”

Section: Supercapacitorsmentioning

confidence: 99%

Macroscopic‐Scale Three‐Dimensional Carbon Nanofiber Architectures for Electrochemical Energy Storage Devices

Chen

Feng

Liang

et al. 2017

162

Therefore, it is necessary to develop highperformance energy storage devices for facilitating the effective utilization of intermittent renewable energy sources. [7][8][9] Among varieties of electrochemical energy storage devices, supercapacitors (known as electrochemical capacitors) [10,11] and some rechargeable batteries (lithium-ion batteries (LIBs), lithiumsulfur (Li-S) batteries, and metal-O 2 batteries) [12][13][14][15] are at the frontier, because they can transport high power and store high energy. Nowadays, they play an indispensable role in our daily life by powering numerous portable electronic devices (e.g., cell phones and laptops), hybrid electric vehicles, and large-scale electrical grids. [16][17][18][19] It is well accepted that the performance of energy storage devices mainly depended on their electrode materials. [20,21] Owing to the advantages of large surface area, light weight, good electrical conductivity, and high thermal/ chemical stability, carbon materials have been considered as the most important electrode materials of supercapacitors and rechargeable batteries [8,20,21] Hence, various nanostructured carbons, such as carbon/graphene quantum dots, [22,23] carbon nanofiber (CNFs), [16,24] carbon nanotubes (CNTs), [13,25] graphene [26][27][28][29][30][31][32] carbon nanosheets, [33,34] 3D carbon nanostructures, [35][36][37] and porous carbon, [38,39] have gained great attention. Among these materials, 3D carbon nanomaterials have some advantages. The interlinked architecture not only shortens transport distances for ions in the well-interconnected wall structure, but also provides a continuous pathway endowing for the fast electron transport. [40] Moreover, the structural interconnectivities guarantee higher electrical conductivity and better mechanical stability. [36,41] Thereby, the design and fabrication of various 3D carbonbased nanostructures, including carbon nanotube networks, graphene gels, graphene foams, and 3D CNFs, have been intensively investigated.Over the past few years, there are many reviews summarizing the progress of fabricating 3D carbon-based nanomaterials. For example, Schneider et al. overviewed the recent advance in the synthesis of 3D arranged carbon nanotube architectures. [42] Li et al. reviewed the carbon-based 3D nanostructures for supercapacitors. [36] Cao and Gui et al. comprehensively reviewed the recent progress in synthesis, properties, and energy applications of CNT sponges, aerogels, and hierarchical composites. [43] The development of high-performance electrochemical energy storage devices is critical for addressing energy crises and environmental pollution.