Kinetics enhancement of lithium–sulfur batteries by interlinked hollow MoO<sub>2</sub> sphere/nitrogen-doped graphene composite

Wu, Xian; Du, Ying; Wang, Pengxiang; Fan, Lishuang; Cheng, Junhan; Wang, Maoxu; Qiu, Yue; Guan, Bin; Wu, Hexian; Zhang, Naiqing; Sun, Kening

doi:10.1039/c7ta08859k

Cited by 77 publications

(48 citation statements)

References 47 publications

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“…[75] Fitting the Nyquist plots at different voltages, the value change of R and CPE was investigated. As shown by previous report, [49] it is demonstrated that the condign frequency at 45° was associated with resistive/capacitive resistance. That is to say, with the fade of electrons accumulation in S1, the charge impedance was reduced.…”

Section: Exploring the Kinetics And Structure Change Of Ni-pr C-nisesupporting

confidence: 68%

“…In the potential of 3.0-0.5 V, it is found that NiSe 2 /N-C delivered the initial discharge/charge capacity of 446.9/416.3 mAh g −1 with coulombic efficiency (CE, 93%), while that of C-NiSe 2 , P-NiSe 2 shown 421. Benefitting from the experience of Na-S battery system, it can be deduced that the NiOC bonds facilitated the trapping of polyselenide, [48,49] effectively remaining the highest residual capacity of NiSe 2 /N-C. Moreover, the CE of P-NiSe 2 was lowest, which is attributed to more exposure of surface area.…”

Section: Exploring the Electrochemical Properties Of Ni-pr C-nise 2 mentioning

confidence: 93%

“…Meanwhile, the metalOC bonds, as the electronic shuttling bridge, could favor the electronic shuttling. [45,48,49] Herein, the clew-like Ni-Pr/PPy spheres were successfully prepared through the self-assembly of Ni-seeds and the in situ polymerization of pyrrole monomer. [45] Owing to the larger atomic radii of Se, the dissolution of poly-selenide was weaker than that of polysulfide.…”

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confidence: 99%

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Hierarchical Hollow‐Microsphere Metal–Selenide@Carbon Composites with Rational Surface Engineering for Advanced Sodium Storage

et al. 2018

Advanced Energy Materials

262

144

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As a result of its high‐energy density, metal–selenides have demanded attention as a potential energy‐storage material. But they suffer from volume expansion, dissolved poly‐selenides and sluggish kinetics. Herein, utilizing' thermal selenization via the Kirkendall effect, microspheres of NiSe2 confined by carbon are successfully obtained from the self‐assembly of Ni‐precursor/PPy. The derived hierarchical hollow architecture increases the active defects for sodium storage, while the existing double N‐doped carbon layers significantly alleviate the volume swelling. As a result, it shows ultrafast rate capability, delivering a stable capacity of 374 mAh g−1, even after 3000 loops at 10.0 A g−1. These remarkable results may be ascribed to the NiOC bonds on the interface of NiSe2 and the carbon film, which leads to the faster transfer of ions, the effective trapping of poly‐selenide, and the highly reversible conversion reaction. The kinetic analysis of cyclic voltammetry (CV) demonstrates that the electrochemical process is mainly dominated by pseudocapacitive behaviors. Supported by the results of electrochemical impedance spectroscopy (EIS), it is confirmed that the solid–electrolyte interface films are reversibly formed/decomposed during cycling. Given this, this elaborate work might open up a potential avenue for the rational design of metal‐sulfur/selenide anodes for advanced battery systems.

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Section: Exploring the Kinetics And Structure Change Of Ni-pr C-nisesupporting

confidence: 68%

Section: Exploring the Electrochemical Properties Of Ni-pr C-nise 2 mentioning

confidence: 93%

mentioning

confidence: 99%

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Hierarchical Hollow‐Microsphere Metal–Selenide@Carbon Composites with Rational Surface Engineering for Advanced Sodium Storage

et al. 2018

Advanced Energy Materials

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“…Fabrication of TiO 2 QDs@MXene/S Cathode : The TiO 2 QDs@MXene/S cathode was fabricated by a simple melting‐diffusion method as reported by us previously . Briefly, the TiO 2 QDs@MXene nanohybrids and sublimed sulfur powder (99.99%, Aladdin S106613) were homogeneously mixed at a weight ratio of 2:8 by milling.…”

Section: Methodsmentioning

confidence: 99%

Ultrathin MXene Nanosheets Decorated with TiO₂ Quantum Dots as an Efficient Sulfur Host toward Fast and Stable Li–S Batteries

Gao

Xie

Zhu

et al. 2018

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Being conductive and flexible, 2D transition metal nitrides and carbides (MXenes) can serve in Li-S batteries as sulfur hosts to increase the conductivity and alleviate the volume expansion. However, the surface functional groups, such as OH and F, weaken the ability of bare MXenes in the chemisorption of polysulfides. Besides, they create numerous hydrogen bonds which make MXenes liable to restack, resulting in substantial loss of active area and, thus, inaccessibility of ions and electrolyte. Herein, a facile, one-step strategy is developed for the growth of TiO quantum dots (QDs) on ultrathin MXene (Ti C T ) nanosheets by cetyltrimethylammonium bromide-assisted solvothermal synthesis. These QDs act as spacers to isolate the MXene nanosheets from restacking, and preserve their 2D geometry which guarantees larger electrode-electrolyte contact area and higher sulfur loading. The stronger adsorption energy of polysulfides with TiO (than with Ti C T ), as proven by density functional theory calculations, is essential for better on-site polysulfide retention. The ultrathin nature and protected conductivity ensure rapid ion and electron diffusion, and the excellent flexibility maintains high mechanical integrity. In result, the TiO QDs@MXene/S cathode exhibits significantly improved long-term cyclability and rate capability, disclosing a new opportunity toward fast and stable Li-S batteries.

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“…[107] Additionally,s trong SÀO binding interactions betweens ulfur and the MoO 2 matrix, as well as the mesoporousa rchitecture, can suppress the dissolution of lithium polysulfides, thus providing the MoO 2 /S composite cathode with ah ighc apacity,e xcellent cycling stability, and fast charget ransfer at the surface of mesoporous MoO 2 . [108] In this composite, the MoO 2 hollow structure and nitrogen-dopedr GO could hold lithium polysulfides throughb oth chemical and physical adsorption,t hus improving the cycling capability.F urthermore, the combination of MoO 2 and nitrogen-doped rGO can accelerate charget ransfer,a nd thus, improvet he kinetics of the as-assembled Li-S batteries. [108] In this composite, the MoO 2 hollow structure and nitrogen-dopedr GO could hold lithium polysulfides throughb oth chemical and physical adsorption,t hus improving the cycling capability.F urthermore, the combination of MoO 2 and nitrogen-doped rGO can accelerate charget ransfer,a nd thus, improvet he kinetics of the as-assembled Li-S batteries.…”

Section: Molybdenum Oxides For Novel Batteriesmentioning

confidence: 99%

Recent Progress on Molybdenum Oxides for Rechargeable Batteries

et al. 2019

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bility during the reaction, andl ow electronic conductivity (ca. 10 À5 Scm À1 ). [28,29] Reduced molybdenum oxides,i ncluding MoO 2 and MoO x (2 < x < 3), with intrinsic oxygen vacancies, comparedwith pure MoO 3 ,can greatly increase the conductivity,a nd have been studied as attractive electrode materials. [30,31] Unfortunately,a s-fabricated batteries based on MoO 2 or MoO x electrodes still suffer from poor cycling stability and low recharge efficiency.T herefore, much effort has been invested over the past few years to pursuet he high energy efficiency, high cycling stability,a nd prominentr ate capability of molybdenum oxide-based electrodes for rechargeable batteries.Herein, we presentabrief summary of recent progress in the use of molybdenum oxides, including MoO 3 and MoO 2 ,a s well their composites, as electrodes for rechargeable batteries, such as LIBs, SIBs, Li-S batteries, Li-O 2 batteries, and other novel battery systems. The charge-storage mechanisms, fabrication of the electrode structures, and electrochemical performances, combined with their relationships, are mainlyd iscussed. This Minireview focuseso nc urrently developed strategies to improvet he energy-storage performances of the electrodes, through morphology modification,d efect engineering, and synergistic effects of hybrid electrodes, and thus, to optimize the electrochemical properties of the batteries. Finally, perspectives on MoO 3 -a nd MoO 2 -based compounds for the future development of rechargeable batteries are also presented.

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Kinetics enhancement of lithium–sulfur batteries by interlinked hollow MoO₂ sphere/nitrogen-doped graphene composite

Abstract: This communication reports an interlinked MoO2 and N-rGO composite as sulfur host for high-performance lithium sulfur battery.

Cited by 77 publications

References 47 publications

Hierarchical Hollow‐Microsphere Metal–Selenide@Carbon Composites with Rational Surface Engineering for Advanced Sodium Storage

Hierarchical Hollow‐Microsphere Metal–Selenide@Carbon Composites with Rational Surface Engineering for Advanced Sodium Storage

Ultrathin MXene Nanosheets Decorated with TiO₂ Quantum Dots as an Efficient Sulfur Host toward Fast and Stable Li–S Batteries

Recent Progress on Molybdenum Oxides for Rechargeable Batteries

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Kinetics enhancement of lithium–sulfur batteries by interlinked hollow MoO2 sphere/nitrogen-doped graphene composite

Abstract: This communication reports an interlinked MoO2 and N-rGO composite as sulfur host for high-performance lithium sulfur battery.

Cited by 77 publications

References 47 publications

Hierarchical Hollow‐Microsphere Metal–Selenide@Carbon Composites with Rational Surface Engineering for Advanced Sodium Storage

Hierarchical Hollow‐Microsphere Metal–Selenide@Carbon Composites with Rational Surface Engineering for Advanced Sodium Storage

Ultrathin MXene Nanosheets Decorated with TiO2 Quantum Dots as an Efficient Sulfur Host toward Fast and Stable Li–S Batteries

Recent Progress on Molybdenum Oxides for Rechargeable Batteries

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Product

Resources

About

Kinetics enhancement of lithium–sulfur batteries by interlinked hollow MoO₂ sphere/nitrogen-doped graphene composite

Ultrathin MXene Nanosheets Decorated with TiO₂ Quantum Dots as an Efficient Sulfur Host toward Fast and Stable Li–S Batteries