Redox-Active Bis-Catecholaldimine Cu(II)-Salen Complex with Hydroxyl Functionality as Cathode Material in Li-Ion...

Area of Science:

• Materials Science
• Electrochemistry
• Inorganic Chemistry

Background:

• Developing efficient cathode materials is crucial for advancing lithium-ion battery technology.
• Copper-Salen complexes offer potential due to their tunable redox properties.

Purpose of the Study:

• To synthesize and characterize a bis-catecholaldimine-based CuII-Salen complex.
• To evaluate its performance as a cathode material in lithium-ion batteries.
• To investigate the redox chemistry of the complex using computational methods.

Main Methods:

• Synthesis of the CuII-Salen complex and its ligand.
• Structural characterization using single-crystal X-ray diffraction.
• Electrochemical performance testing in lithium-ion batteries.
• Density Functional Theory (DFT) computations.

Main Results:

• The CuII-Salen complex ([Cu(LH2)]) was successfully synthesized and structurally characterized.
• The complex exhibited superior cyclic and rate capability performance as a cathode material.
• The [Cu(LH2)] electrode showed an average capacity of 73.5 mAh/g, significantly higher than the ligand's 21.8 mAh/g.
• DFT calculations provided insights into the complex's redox behavior.

Conclusions:

• The bis-catecholaldimine-based CuII-Salen complex is a promising cathode material for lithium-ion batteries.
• Its electrochemical performance surpasses that of the free ligand.
• Further research into copper-Salen complexes could lead to improved battery technologies.