Abstract

Catastrophic failure of lithium-ion batteries occurs across multiple length scales and over very short time periods. A combination of high-speed operando tomography, thermal imaging and electrochemical measurements is used to probe the degradation mechanisms leading up to overcharge-induced thermal runaway of a LiCoO2 pouch cell, through its interrelated dynamic structural, thermal and electrical responses. Failure mechanisms across multiple length scales are explored using a post-mortem multi-scale tomography approach, revealing significant morphological and phase changes in the LiCoO2 electrode microstructure and location dependent degradation. This combined operando and multi-scale X-ray computed tomography (CT) technique is demonstrated as a comprehensive approach to understanding battery degradation and failure.

Highlights

  • Lithium-ion batteries are ubiquitous energy storage devices in portable electronics owing to their high energy and power densities

  • The magnitude of the energy released during failure increases with increasing state-ofcharge (SOC), as the chemical energy stored in the electrode materials is released, thermal runaway resulting from overcharge is catastrophic.[8]

  • During overcharge of lithium-ion batteries, a sequence of events related to the evolution of voltage, temperature and chemistry of the cell occurs leading up to thermal runaway and failure

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Summary

Introduction

Lithium-ion batteries are ubiquitous energy storage devices in portable electronics owing to their high energy and power densities.

Results
Conclusion
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