Electrical Properties and Interfacial Issues of HfO2/Ge MIS Capacitors Characterized by the Thickness of La2O3 Interlayer

Zhao, Lü; Liu, Hongxia; Wang, Xing; Wang, Yongte; Wang, Shulong

doi:10.3390/nano9050697

Cited by 13 publications

(2 citation statements)

References 36 publications

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“…In addition, the XPS spectrum of the precursor GeS 2 for Ge 3d was compared with that of Li 6+ x Sb 1– x Ge x S 5 I ( x = 0.5 and 0.75), as shown in Figure S7. The XPS spectrum of GeS 2 in Figure S7a indicates the coexistence of Ge 2+ (29.8 eV, blue) and Ge 4+ (31.8 eV, green), while the Ge 4+ state was dominant (72%). − The chemical state of Ge was changed during the synthesis process, forming GeS 4 4– at 30.9 eV in Li 6+ x Sb 1– x Ge x S 5 I, suggesting substitution of Ge into the SbS 4 3– tetrahedra.…”

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confidence: 99%

Lithium Argyrodite Sulfide Electrolytes with High Ionic Conductivity and Air Stability for All-Solid-State Li-Ion Batteries

et al. 2021

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Solid electrolytes (SEs) are promising candidates for enhancing the energy density and safety of conventional lithium-ion batteries. Recently, lithium thioantimonate iodide argyrodites have been regarded as promising SEs because of their high ionic conductivities and air-stability. In this study, we utilized highenergy ball milling to synthesize Ge-substituted thioantimonate argyrodites and achieved an ionic conductivity of 16.1 mS cm −1 for Li 6.5 Sb 0.5 Ge 0.5 S 5 I, which is the highest value among the reported cold-pressed SE pellets. First-principles calculations reveal that concerted Li-ion migrations through the inter-cage paths substantially improve the ionic conductivity. Li 6.5 Sb 0.5 Ge 0.5 S 5 I shows good compatibility with LiNi 0.5 Co 0.2 Mn 0.3 O 2 -based all-solid-state batteries (ASSBs) after applying Li 3 YCl 6 as a catholyte, which exhibits a high discharge capacity of 164 mAh g −1 and good cycle stability. Ge-substituted thioantimonate argyrodites exhibit excellent air-stability, which facilitates reducing the synthesis and fabrication costs of ASSBs with hygroscopic P-based sulfide SEs. The superionic conductors with high air-stability reported in this study demonstrate substantial promise for the development of ASSBs.

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confidence: 99%

Lithium Argyrodite Sulfide Electrolytes with High Ionic Conductivity and Air Stability for All-Solid-State Li-Ion Batteries

et al. 2021

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“…Hafnium oxide (HfO 2 ) with its high thermal, chemical and mechanical stability, as well as its high refractive index and dielectric constant is remarkably appealing for new nanostructure architectures like nanoporous or nanotube (NT) arrays and a large range of applications [5][6][7][8][9][10][11][12]. Having into account the emerging application of anodic TiO 2 nanotubes in DSCs, the question arises about the applicability of self-ordered arrays of anodic HfO 2 for the same purpose.…”

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confidence: 99%

Tailoring the Anodic Hafnium Oxide Morphology Using Different Organic Solvent Electrolytes

et al. 2020

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Highly ordered anodic hafnium oxide (AHO) nanoporous or nanotubes were synthesized by electrochemical anodization of Hf foils. The growth of self-ordered AHO was investigated by optimizing a key electrochemical anodization parameter, the solvent-based electrolyte using: Ethylene glycol, dimethyl sulfoxide, formamide and N-methylformamide organic solvents. The electrolyte solvent is here shown to highly affect the morphological properties of the AHO, namely the self-ordering, growth rate and length. As a result, AHO nanoporous and nanotubes arrays were obtained, as well as other different shapes and morphologies, such as nanoneedles, nanoflakes and nanowires-agglomerations. The intrinsic chemical-physical properties of the electrolyte solvents (solvent type, dielectric constant and viscosity) are at the base of the properties that mainly affect the AHO morphology shape, growth rate, final thickness and porosity, for the same anodization voltage and time. We found that the interplay between the dielectric and viscosity constants of the solvent electrolyte is able to tailor the anodic oxide growth from continuous-to-nanoporous-to-nanotubes.

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Introducing 4s–2p Orbital Hybridization to Stabilize Spinel Oxide Cathodes for Lithium‐Ion Batteries

et al. 2022

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Oxides composed of an oxygen framework and interstitial cations are promising cathode materials for lithium‐ion batteries. However, the instability of the oxygen framework under harsh operating conditions results in fast battery capacity decay, due to the weak orbital interactions between cations and oxygen (mainly 3d–2p interaction). Here, a robust and endurable oxygen framework is created by introducing strong 4s–2p orbital hybridization into the structure using LiNi0.5Mn1.5O4 oxide as an example. The modified oxide delivers extraordinarily stable battery performance, achieving 71.4 % capacity retention after 2000 cycles at 1 C. This work shows that an orbital‐level understanding can be leveraged to engineer high structural stability of the anion oxygen framework of oxides. Moreover, the similarity of the oxygen lattice between oxide electrodes makes this approach extendable to other electrodes, with orbital‐focused engineering a new avenue for the fundamental modification of battery materials.

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Electrical Properties and Interfacial Issues of HfO2/Ge MIS Capacitors Characterized by the Thickness of La2O3 Interlayer

Cited by 13 publications

References 36 publications

Lithium Argyrodite Sulfide Electrolytes with High Ionic Conductivity and Air Stability for All-Solid-State Li-Ion Batteries

Lithium Argyrodite Sulfide Electrolytes with High Ionic Conductivity and Air Stability for All-Solid-State Li-Ion Batteries

Tailoring the Anodic Hafnium Oxide Morphology Using Different Organic Solvent Electrolytes

Introducing 4s–2p Orbital Hybridization to Stabilize Spinel Oxide Cathodes for Lithium‐Ion Batteries

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