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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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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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Crystal Field Theory
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Phase engineering of cobalt hydroxide toward cation intercalation.

Jianbo Li1, Zhenhua Li1, Fei Zhan2

  • 1State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology Beijing 100029 P. R. China shaomf@mail.buct.edu.cn LZH0307@mail.buct.edu.cn +86-10-64425385 +86-10-64412131.

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Layered cobalt hydroxides show high capacity for multi-cation storage in aqueous electrolytes. Activated alpha-cobalt hydroxide offers superior performance and cycle life compared to beta-cobalt hydroxide for energy storage devices.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Multi-cation intercalation in aqueous media is key for developing safe energy storage.
  • Challenges remain in finding suitable host matrices and understanding cation-interlayer structure relationships.

Purpose of the Study:

  • To demonstrate layered cobalt hydroxides as effective hosts for multi-cation intercalation.
  • To elucidate the relationship between cation intercalation and interlayer structure for material design.

Main Methods:

  • Electrochemical activation of layered cobalt hydroxides (alpha- and beta-Co(OH)2).
  • Evaluation of multi-cation (Li+, Na+, K+, Mg2+, Ca2+) storage capacities.
  • Analysis of phase transformation and interlayer structure changes during intercalation.

Main Results:

  • Layered cobalt hydroxides exhibit high metal ion storage capacities post-phase transformation.
  • Activated alpha-Co(OH)2 shows significantly higher capacity (4x) and better cycle stability (93.9% vs ~74.8% after 5000 cycles) than activated beta-Co(OH)2.
  • The intercalated structure of alpha-Co(OH)2 is more conducive to electrochemical activation and phase transition.

Conclusions:

  • Layered cobalt hydroxides are promising hosts for multi-cation intercalation in aqueous electrolytes.
  • The study highlights the critical role of interlayer structure in dictating cation intercalation and electrochemical performance.
  • Findings provide insights for designing advanced multi-ion storage materials.