A simple chemical method for deposition of electrochromic potassium manganese oxide hydrate thin films

Najdoski, Metodija; Koleva, V.; Demiri, Sani; Stojkovikj, Sasho

doi:10.1016/j.materresbull.2012.05.057

Cited by 9 publications

(5 citation statements)

References 27 publications

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“…That may be caused by that the MnO 6 octahedral layers are separated from each other by a distance of around 7 Å, which will contains mono-or divalent cations (Li þ , Na þ , K þ , Cs þ , Co 2þ , Zn 2þ , and etc.) more or less hydrated [40]. Consider the existence of K þ ion and H 2 O molecule in the preparation process, so we concluded that the as-prepared MnO 2 may be K x MnO 2 $H 2 O, which are consistent with that of XRD.…”

Section: Characterization Of the As-prepared Samples Prepared With DIsupporting

confidence: 79%

Freestanding one-dimensional manganese dioxide nanoflakes-titanium cabide/carbon core/double shell arrays as ultra-high performance supercapacitor electrode

Kong

Cheng

Ouyang

et al. 2015

Journal of Power Sources

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Section: Characterization Of the As-prepared Samples Prepared With DIsupporting

confidence: 79%

Freestanding one-dimensional manganese dioxide nanoflakes-titanium cabide/carbon core/double shell arrays as ultra-high performance supercapacitor electrode

Kong

Cheng

Ouyang

et al. 2015

Journal of Power Sources

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“…This assignment is in accord with the chain structure of Li 2 S 4 , where the sulfur atoms at both ends have a formal charge of ( À 1), while those in the middle bear a formal charge of (0) 32,39 . Figure 4e displays the XPS Mn 2p 3/2 spectra of d-MnO 2 , which is mainly composed of Mn 4 þ , with its nearsurface enriched in Mn 3 þ relative to the bulk 40 . The MnO 2 nanosheet spectrum is typical of birnessite 41 , showing a strong Mn 2p 3/2 Mn 4 þ contribution that appears as a characteristic multiplet with a maximum at 642.5 eV, and three satellite peaks at higher binding energies of 643.7, 644.8 and 645.7 eV.…”

Section: Resultsmentioning

confidence: 99%

A highly efficient polysulfide mediator for lithium–sulfur batteries

et al. 2015

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The lithium-sulfur battery is receiving intense interest because its theoretical energy density exceeds that of lithium-ion batteries at much lower cost, but practical applications are still hindered by capacity decay caused by the polysulfide shuttle. Here we report a strategy to entrap polysulfides in the cathode that relies on a chemical process, whereby a hostmanganese dioxide nanosheets serve as the prototype-reacts with initially formed lithium polysulfides to form surface-bound intermediates. These function as a redox shuttle to catenate and bind 'higher' polysulfides, and convert them on reduction to insoluble lithium sulfide via disproportionation. The sulfur/manganese dioxide nanosheet composite with 75 wt% sulfur exhibits a reversible capacity of 1,300 mA h g À 1 at moderate rates and a fade rate over 2,000 cycles of 0.036%/cycle, among the best reported to date. We furthermore show that this mechanism extends to graphene oxide and suggest it can be employed more widely.

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“…The two peaks at higher binding energies correspond to Mn 4+ , and the peaks at 640.8 and 641.4 eV correspond to Mn 2+ and Mn 3+ , respectively. 44,60 This result shows that a portion of Mn 4+ (high oxidation state) is transformed into Mn 3+ and Mn 2+ (low oxidation states), which further illustrates that MnO 2 could catalytically convert LiPSs to a polythionate complex. Notably, the insoluble nature of the polythionate complex makes it a good mediator for the conversion of LiPSs to Li 2 S 2 /Li 2 S, as it greatly suppresses the shuttle effect of LiPSs and results in an improved cycling stability and security.…”

Section: Acs Applied Materials and Interfacesmentioning

confidence: 88%

Self-Assembled Close-Packed MnO₂ Nanoparticles Anchored on a Polyethylene Separator for Lithium–Sulfur Batteries

Xiong

Chen

Wang

et al. 2018

ACS Appl. Mater. Interfaces

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Separator modification has been proved to be an effective approach for overcoming lithium polysulfide (LiPS) shuttling in lithium-sulfur (Li-S) cells. However, the weight and stability of the modified layer also affect the cycling properties and the energy density of Li-S cells. Here, we initially construct an ultrathin and lightweight MnO layer (380 nm, 0.014 mg cm) on a commercial polyethylene (PE) separator (MnO@PE) through a chemical self-assembly method. This MnO layer is tightly anchored onto the PE substrate because of the presence of oxygen-containing groups that form a relatively strong chemical force between the MnO nanoparticles and the PE substrate. In addition, the mechanical strength of the separator is not affected by this modification procedure. Moreover, because of the catalytic effect and compactness of the MnO layer, the MnO@PE separator can greatly suppress LiPS shuttling. As a result, the application of this MnO@PE separator in Li-S batteries leads to high reversible capacity and superior cycling stability. This strategy provides a novel approach to separator surface modification.

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A simple chemical method for deposition of electrochromic potassium manganese oxide hydrate thin films

Cited by 9 publications

References 27 publications

Freestanding one-dimensional manganese dioxide nanoflakes-titanium cabide/carbon core/double shell arrays as ultra-high performance supercapacitor electrode

Freestanding one-dimensional manganese dioxide nanoflakes-titanium cabide/carbon core/double shell arrays as ultra-high performance supercapacitor electrode

A highly efficient polysulfide mediator for lithium–sulfur batteries

Self-Assembled Close-Packed MnO₂ Nanoparticles Anchored on a Polyethylene Separator for Lithium–Sulfur Batteries

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A simple chemical method for deposition of electrochromic potassium manganese oxide hydrate thin films

Cited by 9 publications

References 27 publications

Freestanding one-dimensional manganese dioxide nanoflakes-titanium cabide/carbon core/double shell arrays as ultra-high performance supercapacitor electrode

Freestanding one-dimensional manganese dioxide nanoflakes-titanium cabide/carbon core/double shell arrays as ultra-high performance supercapacitor electrode

A highly efficient polysulfide mediator for lithium–sulfur batteries

Self-Assembled Close-Packed MnO2 Nanoparticles Anchored on a Polyethylene Separator for Lithium–Sulfur Batteries

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Self-Assembled Close-Packed MnO₂ Nanoparticles Anchored on a Polyethylene Separator for Lithium–Sulfur Batteries