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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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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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Multi-Metal Synergistic Doping Enabling High-Entropy Copper-Based Nanosphere Libraries for Advanced Lithium-Ion

Yana Luo1, Li Ling1, Mou Zhang2

  • 1Department of Materials Science and Engineering, Jiangsu Key Laboratory of Artificial Functional Materials, Collaborative Innovation Center of Advanced Microstructures, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210023, P. R. China.

Inorganic Chemistry
|September 15, 2025
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Summary

High-entropy copper-based materials offer superior performance for next-generation lithium-ion batteries. A novel multimetal doping strategy enhances copper anodes, overcoming limitations for advanced energy storage.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Copper-based materials are promising for lithium-ion battery anodes due to high theoretical capacity.
  • Their practical use is limited by semiconducting properties and slow reaction kinetics.

Purpose of the Study:

  • To develop a universal low-temperature multimetal synergistic doping strategy for high-entropy Cu-based materials (HE-CBMs).
  • To enhance the electrochemical performance of copper anodes for next-generation lithium-ion batteries.

Main Methods:

  • Synthesized a library of 54 high-entropy Cu-based materials (HE-CBMs) using a solvothermal approach followed by low-temperature reduction.
  • Precisely modulated coordination environments and stoichiometric ratios of eight transition metals (Cr, Mn, Fe, Co, Ni, Cu, Zn, Cd).
  • Investigated the synergistic effects of multimetal doping on lattice structure and electronic properties.

Main Results:

  • The multimetal synergy induced lattice distortion and electron-deficient states, reducing Li+ diffusion barriers and optimizing charge transfer.
  • The optimized octonary HE-Cu anode (CrMnFeCoNiCuZnCd) delivered a high reversible capacity of 2211.2 mAh g-1 after 250 cycles at 1 A g-1.
  • Exceptional long-term stability was observed, retaining 1270.4 mAh g-1 over 900 cycles at 5 A g-1.

Conclusions:

  • Established a scalable combinatorial platform for synthesizing HE materials under mild conditions.
  • Elucidated fundamental principles of multimetal synergy for advanced energy storage systems.
  • Demonstrated the potential of HE-CBMs as high-performance anodes for next-generation lithium-ion batteries.