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Electrodeposition01:08

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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
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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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Super-Reversible CuF2 Cathodes Enabled by Cu2+ -Coordinated Alginate.

Jiale Xia1,2, Zeyi Wang1, Nuwanthi D Rodrig3

  • 1Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA.

Advanced Materials (Deerfield Beach, Fla.)
|September 2, 2022
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Summary

Copper fluoride (CuF2) cathodes suffer from ion dissolution, limiting their cycle life. A novel Cu2+-coordinated sodium alginate (Cu-SA) coating effectively suppresses copper dissolution, enhancing CuF2 battery performance and stability.

Keywords:
Li-ion batteriescopper fluoridecross-link effecthydroxylated copper fluoridesodium alginate

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • Copper fluoride (CuF2) exhibits high theoretical energy density for Li-ion batteries.
  • CuF2 cathodes suffer from poor cycle stability due to Cu-ion dissolution.

Purpose of the Study:

  • To suppress Cu-ion dissolution in CuF2 cathodes.
  • To enhance the electrochemical performance and stability of CuF2-based batteries.

Main Methods:

  • Fabrication of CuF2 electrodes using sodium alginate (SA) binder in water.
  • Formation of a Cu2+-coordinated SA (Cu-SA) layer on CuF2 particles.
  • Electrochemical testing in organic electrolyte.

Main Results:

  • A conformal Cu-SA layer was formed in situ, acting as a Li-ion conductor and Cu2+ insulator.
  • Cu-ion dissolution was effectively suppressed, significantly improving reversibility.
  • CuF2 electrodes with SA binder achieved 420.4 mAh g-1 after 50 cycles at 0.05 C, with an energy density of 1009.1 Wh kg-1.

Conclusions:

  • The Cu-SA coating strategy successfully stabilizes high-energy CuF2 cathodes.
  • This approach offers a promising pathway for developing advanced Li-ion batteries.