Integrated Anode Electrode Composited Cu⁻Sn Alloy and Separator for Microscale Lithium Ion Batteries

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Developing advanced anode materials is crucial for high-performance batteries.
• Volume expansion of active materials during cycling leads to capacity fading and poor stability.
• Integrated electrode designs offer potential solutions to these challenges.

Purpose of the Study:

• To design and synthesize a novel integrated electrode structure for enhanced battery performance.
• To investigate the effect of the integrated structure on energy density, fabrication process, and cycle stability.
• To evaluate the electrochemical performance of the developed electrode.

Main Methods:

• Direct electrodeposition of Cu-Sn alloy anode material onto a Celgard 2400 separator.
• Fabrication of the integrated Cel-CS electrode.
• Electrochemical testing, including cycling performance and rate capability measurements.

Main Results:

• The Cel-CS electrode simplifies battery fabrication and increases energy density.
• The integrated structure effectively buffers mechanical stress, preventing active material detachment and improving cycle stability.
• Achieved 728 mA·h·g^-1 after 250 cycles at 100 mA·g^-1 and 938 mA·h·g^-1 after 650 cycles at 5 A·g^-1.

Conclusions:

• The novel integrated Cel-CS electrode demonstrates excellent cycle performance and superior rate capability.
• This design shows significant potential for application in microelectronic devices and systems.
• The integrated structure effectively addresses the challenges of volume expansion and material detachment in alloy anodes.