Integratable all-solid-state thin-film microbatteries.

Area of Science:

• Materials Science and Engineering
• Electrochemistry
• Microelectronics

Background:

• Large-scale integration of microbattery systems on chips is limited by the incompatibility between electrochemical and microelectronic fabrication processes.
• Existing microbattery technologies face challenges in manufacturability and performance for on-chip applications.

Purpose of the Study:

• To develop a silicon-based all-solid-state thin-film microbattery cell compatible with low-temperature, on-chip integration.
• To address the technical barriers hindering the large-scale integration of microbattery systems.

Main Methods:

• Development of a silicon-based all-solid-state thin-film microbattery cell using low-temperature fabrication.
• Implementation of stress management techniques at interfaces, including fracture resistance and strain regulation.
• Proposal of a collective microfabrication protocol for on-chip microbattery packs.

Main Results:

• Achieved high-rate performance (34.4 mA cm⁻²) and fast charge-discharge properties (1,000,000 cycles at 20 mA cm⁻²).
• Demonstrated high-temperature tolerance (150 °C) under zero stack pressure.
• Uncovered intrinsic relationships between lithium utilization, strain, stress, and interface behavior.

Conclusions:

• The developed microbattery technology effectively overcomes key challenges in on-chip integration.
• The proposed microfabrication protocol enables the creation of series-connected microbattery packs for practical applications.
• This work provides a viable pathway for engineering robust on-chip microbattery systems for large-scale deployment.