Vanadium dioxide–reduced graphene oxide binary host as an efficient polysulfide plague for high-performance lithium–sulfur batteries

Li, Sha; Cen, Yuan; Qin, Xiang; Aslam, Muhammad Kashif; Hu, Bingbing; Li, Wei; Tang, Ya; Qi, Yu; Liu, Yuping; Chen, Changguo

doi:10.1039/c8ta10422k

Cited by 112 publications

(53 citation statements)

References 56 publications

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“…However, soluble and polar lithium polysulfides can lose their electrical contact with nonpolar carbon materials and dissolve into the electrolyte after a long work time as a consequence of weak polar-nonpolar effects, leading to poor Coulombic efficiency, low utilization of S and slow redox kinetics [40,41]. Thus, polar host materials, such as transition metal oxides and sulfides, are employed to improve the adsorption of lithium polysulfides by enhancing the chemical binding [42][43][44][45][46][47][48][49]. Unfortunately, unsatisfied electrical conductivity of most metal oxides and sulfides is detrimental to the kinetics of sulfur electrochemical conversion, leading to poor cycling performance and low sulfur utilization, as well as poor rate capability [50][51][52][53].…”

Section: Introductionmentioning

confidence: 99%

Lotus Root-Like Nitrogen-Doped Carbon Nanofiber Structure Assembled with VN Catalysts as a Multifunctional Host for Superior Lithium–Sulfur Batteries

et al. 2019

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Lithium–sulfur batteries (LSBs) are regarded as one of the most promising energy-recycling storage systems due to their high energy density (up to 2600 Wh kg−1), high theoretical specific capacity (as much as 1672 mAh g−1), environmental friendliness, and low cost. Originating from the complicated redox of lithium polysulfide intermediates, Li–S batteries suffer from several problems, restricting their application and commercialization. Such problems include the shuttle effect of polysulfides (Li2Sx (2 < x ≤ 8)), low electronic conductivity of S/Li2S/Li2S2, and large volumetric expansion of S upon lithiation. In this study, a lotus root-like nitrogen-doped carbon nanofiber (NCNF) structure, assembled with vanadium nitride (VN) catalysts, was fabricated as a 3D freestanding current collector for high performance LSBs. The lotus root-like NCNF structure, which had a multichannel porous nanostructure, was able to provide excellent (ionically/electronically) conductive networks, which promoted ion transport and physical confinement of lithium polysulfides. Further, the structure provided good electrolyte penetration, thereby enhancing the interface contact with active S. VN, with its narrow resolved band gap, showed high electrical conductivity, high catalytic effect and polar chemical adsorption of lithium polysulfides, which is ideal for accelerating the reversible redox kinetics of intermediate polysulfides to improve the utilization of S. Tests showed that the VN-decorated multichannel porous carbon nanofiber structure retained a high specific capacity of 1325 mAh g−1 after 100 cycles at 0.1 C, with a low capacity decay of 0.05% per cycle, and demonstrated excellent rate capability.

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Section: Introductionmentioning

confidence: 99%

Lotus Root-Like Nitrogen-Doped Carbon Nanofiber Structure Assembled with VN Catalysts as a Multifunctional Host for Superior Lithium–Sulfur Batteries

et al. 2019

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“…The calculating results of D Li + (Li + diffusion coefficient) are summarized in Table S1 in the Supporting Information. Compared with the rGO@S electrode, the HsGY@S electrode presents the higher D Li + , which is also manifested in our previous work on lithium‐ion batteries (LIBs) electrochemical mechanism . The rate capability of the HsGY@S and rGO@S electrode was tested at different current densities (Figure d).…”

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confidence: 57%

Synthesis of Hydrogen‐Substituted Graphyne Film for Lithium–Sulfur Battery Applications

Liu

et al. 2019

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Graphyne (GY) is a new type of carbon allotrope, which is viewed as a rapidly rising star in the carbon family referred to as 2D carbon allotropes due to its extraordinary properties. Considering the dynamic nature of the alkyne metathesis reaction, a hydrogen‐substituted graphyne (HsGY) film is successfully synthesized on a gas/liquid interface using 1,3,5‐tripynylbenzene (TPB) as the precursor. The synthesized HsGY film is used as a sulfur host matrix to be applied in lithium–sulfur batteries (LSBs). The HsGY@S electrode is prepared using S8 as sulfur source and presents excellent electrochemical performance.

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“…where i is the current density obtained in CV, ν is the scan rate of 50 mV/s. Electrochemical impedance spectroscopy (EIS) is an in-situ diagnostic characterization incorporated in single cell [25,[34][35][36] . It was carried out by using Solartron 1287 + 1260 at 1.45 V and 80 °C.…”

Section: Physicochemical Characterizationmentioning

confidence: 99%

An effective oxygen electrode based on Ir0.6Sn0.4O2 for PEM water electrolyzers

Jiang

Hao

et al. 2019

Journal of Energy Chemistry

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Vanadium dioxide–reduced graphene oxide binary host as an efficient polysulfide plague for high-performance lithium–sulfur batteries

Abstract: Lithium–sulfur batteries are strongly expected to be the next-generation energy storage technology due to their superior theoretical specific capacity and energy density.

Cited by 112 publications

References 56 publications

Lotus Root-Like Nitrogen-Doped Carbon Nanofiber Structure Assembled with VN Catalysts as a Multifunctional Host for Superior Lithium–Sulfur Batteries

Lotus Root-Like Nitrogen-Doped Carbon Nanofiber Structure Assembled with VN Catalysts as a Multifunctional Host for Superior Lithium–Sulfur Batteries

Synthesis of Hydrogen‐Substituted Graphyne Film for Lithium–Sulfur Battery Applications

An effective oxygen electrode based on Ir0.6Sn0.4O2 for PEM water electrolyzers

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