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Fracture Dynamics in Silicon Anode Solid-State Batteries.

Douglas Lars Nelson¹, Stephanie E Sandoval¹, Jaechan Pyo²

¹School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.

ACS Energy Letters

|December 19, 2024

Summary

This summary is machine-generated.

Solid-state batteries with silicon anodes show promise for higher energy density. This study reveals how silicon anode cracking during cycling causes degradation, offering insights for more durable battery designs.

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Failure Analysis of Batteries Using Synchrotron-based Hard X-ray Microtomography

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Published on: August 26, 2015

Area of Science:

Materials Science
Electrochemistry
Battery Technology

Background:

Solid-state batteries (SSBs) offer enhanced safety and energy density over conventional lithium-ion batteries.
Silicon anodes are promising for high-capacity energy storage but suffer from significant volumetric changes during cycling.
The chemo-mechanical degradation mechanisms of silicon anodes in SSBs remain poorly understood.

Purpose of the Study:

To investigate the micro- to macro-scale chemo-mechanical degradation processes of silicon anodes in solid-state batteries.
To elucidate the formation and impact of cracks within silicon anodes and at the solid electrolyte interface.
To provide insights for designing more resilient electrodes for next-generation batteries.

Main Methods:

Utilized *operando* X-ray computed microtomography to visualize degradation in real-time.
Employed continuum phase-field damage modeling to quantify stress distributions and fracture.
Analyzed crack formation at the silicon/solid electrolyte interface and within the silicon anode.

Main Results:

Observed the formation of mud-type channel cracks across the silicon anode, driven by biaxial tensile stress during delithiation.
Identified detrimental interfacial cracks resulting from local reaction competition between silicon domains of varying sizes.
Quantified stress-driven channel cracking and its critical role in interfacial fracture, linked to the lithiated silicon stress state.

Conclusions:

The study reveals key chemo-mechanical degradation mechanisms specific to silicon anodes in SSBs.
Interfacial cracking is influenced by local stress states and domain size variations.
Findings provide essential guidelines for engineering robust silicon electrodes for high-energy solid-state batteries.