Amorphous Vanadium Titanates as a Negative Electrode for Lithium-ion Batteries

Lee, Jeong Beom; Chae, Oh B.; Chae, Seulki; Ryu, Ji Heon; Oh, Seung M.

doi:10.5229/jecst.2016.7.4.306

Cited by 2 publications

(1 citation statement)

References 51 publications

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“…However, merely increasing the ion-storage sites is not sufficient to increase the capacity. An adequate number of electrons are also required to attain local neutrality during cycling ( 25 ). It is equally important to improve the local electron-transfer ability of active sites to quickly achieve charge balance, especially for the storage of high–charge density multivalent ions.…”

Section: Introductionmentioning

confidence: 99%

Amorphous anion-rich titanium polysulfides for aluminum-ion batteries

et al. 2021

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The strong electrostatic interaction between Al3+ and close-packed crystalline structures, and the single-electron transfer ability of traditional cationic redox cathodes, pose challenged for the development of high-performance rechargeable aluminum batteries. Here, to break the confinement of fixed lattice spacing on the diffusion and storage of Al-ion, we developed a previously unexplored family of amorphous anion-rich titanium polysulfides (a-TiSx, x = 2, 3, and 4) (AATPs) with a high concentration of defects and a large number of anionic redox centers. The AATP cathodes, especially a-TiS4, achieved a high reversible capacity of 206 mAh/g with a long duration of 1000 cycles. Further, the spectroscopy and molecular dynamics simulations revealed that sulfur anions in the AATP cathodes act as the main redox centers to reach local electroneutrality. Simultaneously, titanium cations serve as the supporting frameworks, undergoing the evolution of coordination numbers in the local structure.

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Section: Introductionmentioning

confidence: 99%

Amorphous anion-rich titanium polysulfides for aluminum-ion batteries

et al. 2021

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From Crystalline to Amorphous: An Effective Avenue to Engineer High‐Performance Electrode Materials for Sodium‐Ion Batteries

Wei

Wang

Yang

et al. 2018

Adv Materials Inter

121

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global concerns about the sustainability of LIBs, due to the rarity and uneven distribution of lithium on earth. [3] With this in mind, batteries employing earth-abundant elements as charge carriers with similar working principles, such as sodiumion batteries (SIBs) and potassium-ion batteries (PIBs), are promising as realistic alternatives for grid-level stationary applications. [4] As the critical component for rechargeable batteries, electrode materials play an important role in improving the energy density of the whole system, which can be realized by increasing the output voltage or capacity. [5] In recent years, since the emerging sodium and potassiumbased batteries have the potential to meet large-scale grid energy storage, intensive research have been devoted to this field, accompanied by significant progress. However, there is still considerable room for improvement regarding the electrode-active materials for SIBs and PIBs. This is because the accommodation of sodium or potassium in host materials is much more difficult than lithium ions, owing to their much larger ionic radii. [6] Their magnitude may cause severe pulverization of the electrode resulting from the distortions in the host lattice after repeated (de)intercalation and subsequently, a loss of contact between the active material and the current collector, resulting in the failure of the cell.During the past few decades, crystalline materials, as the primary electro-active species of choice in the battery field, have been thoroughly investigated. However, their synthesis can be time consuming, energy intensive, and costly. Besides, the storage capacity in crystalline materials is critically dependent on several factors including orientation of the crystallites, exposure of electrochemically active facets, phase transitions, and structural stability. [7] Generally, the charge storage mechanism of these kinds of material is based on guest ion insertion/extraction during the charge/discharge process. However, these host materials have limited ion channels for guest ions. As their counterpart, amorphous materials are intrinsically different in the arrangement of atomic clusters in the manner of short-range ordering, while these clusters are randomly linked with each other. [8] Hence, the amorphous state can be easily identified by conventional characterization technique such as no obvious diffraction peaks in powder X-ray diffraction (XRD). Owing to such long-range disordered and short-range ordered Room-temperature rechargeable sodium-ion batteries appear to be promising alternatives for grid and other storage applications to lithium-ion batteries because of the natural abundance, low cost, and environmental benignity of sodium. In response to the ever-increasing development for these technologies, an intensive exploration for appropriate electrode materials with high energy density is still underway. This Progress Report highlights the recent research in the investigation of amorphous materials, whose isotropic physical and chemical propertie...

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Amorphous Vanadium Titanates as a Negative Electrode for Lithium-ion Batteries

Cited by 2 publications

References 51 publications

Amorphous anion-rich titanium polysulfides for aluminum-ion batteries

Amorphous anion-rich titanium polysulfides for aluminum-ion batteries

From Crystalline to Amorphous: An Effective Avenue to Engineer High‐Performance Electrode Materials for Sodium‐Ion Batteries

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