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Formation of Complex Ions

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
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Synergetic Sn Incorporation-Zn Substitution in Copper-Based Sulfides Enabling Superior Na-Ion Storage.

Wenjing Li1, Caiyan Yu1, Shaozhuan Huang2

  • 1International Joint Research Laboratory of New Energy Materials and Devices of Henan Province, School of Physics and Electronics, Henan University, Kaifeng, 475004, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|October 15, 2023
PubMed
Summary

Researchers developed advanced copper-based sulfides for sodium-ion batteries. This strategy enhances charge storage and stability, enabling faster charging and longer battery life.

Keywords:
Na-ion batterycopper-based sulfidessuperfast chargingsynergetic heteroatoms incorporation-substitutionultrastable cyclability

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Transition-metal sulfides are promising anode materials for high-energy sodium-ion batteries.
  • Existing materials suffer from low charge storage, significant volume changes, and slow reaction kinetics.
  • These limitations hinder their practical application in next-generation batteries.

Purpose of the Study:

  • To develop a novel anode material for sodium-ion batteries with improved performance.
  • To address the challenges of low capacity, poor cycling stability, and sluggish kinetics in transition-metal sulfides.
  • To explore a synergetic strategy of element incorporation and substitution for enhanced electrochemical properties.

Main Methods:

  • A synergetic strategy involving tin (Sn) incorporation and zinc (Zn) substitution in copper-based sulfides was employed.
  • Tin incorporation was initially used to enhance sodium-ion storage capability.
  • Zinc substitution was subsequently performed to maintain high capacity and improve cycling and rate performance by promoting ion diffusion and relieving mechanical stress.

Main Results:

  • The modified copper-based sulfides exhibited a high specific capacity of approximately 560 mAh g⁻¹ at 0.5 A g⁻¹.
  • The material demonstrated ultrastable cyclability over 80,000 cycles with nearly 100% capacity retention.
  • Superior rate capability up to 200 A g⁻¹ and ultrafast charging (approximately 4 seconds) were achieved.

Conclusions:

  • The synergetic Sn incorporation and Zn substitution strategy effectively overcomes the intrinsic limitations of transition-metal sulfide anodes.
  • This approach significantly enhances specific capacity, cycling stability, and rate performance for sodium-ion batteries.
  • The findings offer valuable insights for designing advanced anode materials through multi-cation strategies.