High-Performance Anode Material of Tert-Butyl-Modified Naphthalocyanine Based on Spatial-Electronic Dual-Regulation...

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Transition metal oxides offer high theoretical capacities for lithium-ion battery (LIB) anodes.
• Volume expansion during cycling is a major limitation for transition metal oxide anode materials in LIBs.

Purpose of the Study:

• To develop a stable and high-performance anode material for next-generation LIBs.
• To address the volume expansion issue in LIB anodes using a novel composite structure.

Main Methods:

• Synthesis of cobalt phthalocyanine modified by tert-butyl groups (tBuCoNc).
• Construction of cobalt oxide/nitrogen-doped graphene composites via π-π stacking and thermal treatment.
• Electrochemical testing to evaluate anode performance.

Main Results:

• The synthesized composite exhibits a unique structure with uniformly dispersed cobalt oxide nanocrystals within a nitrogen-doped carbon matrix.
• The material demonstrated an initial discharge capacity of 1556.5 mAh g⁻¹ at 100 mA g⁻¹.
• The anode retained a capacity of 741.1 mAh g⁻¹ after 100 cycles, indicating excellent stability.

Conclusions:

• The cobalt oxide/nitrogen-doped graphene composite shows significant potential as a high-performance anode material for LIBs.
• The "steric-electronic" dual regulation strategy effectively enhances structural stability and electrochemical performance.
• The synergistic effects between cobalt oxide and N-doped graphene contribute to improved ion diffusion and electrolyte contact.