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**Summary:**

A new study published in *Science* suggests that failures in solid-state batteries (SSBs) may be due to mechanical fatigue in the lithium anode, similar to how metals fail under repeated stress. Researchers observed the anode-electrolyte interface in an SSB during charge-discharge cycles and found that voids formed and grew, ultimately leading to cracking and short-circuiting. This suggests that the repeated stripping and plating of lithium onto the anode causes stress that leads to fatigue and failure, even at low current levels. Understanding this mechanism can lead to more sophisticated battery models and improved SSB design, despite not needing a change to manufacturing

**News Article:**

**Solid-State Battery Failures Linked to Mechanical Fatigue, New Study Finds**

*Nagpur, India – May 18, 2025* – Scientists may have cracked the code to improving the longevity of solid-state batteries (SSBs), a promising technology for powering everything from electric vehicles to medical devices. A groundbreaking study published in *Science* reveals that the culprit behind SSB failures may lie in mechanical fatigue within the lithium anode, akin to how metals break down under repeated stress.

SSBs offer advantages over traditional lithium-ion batteries, including longer lifespans, higher energy density, and improved safety. However, a persistent challenge has been their susceptibility to cracking and short-circuiting due to a phenomenon called dendrite growth – the formation of lithium filaments that pierce the solid electrolyte.

Researchers from Tongji University in Shanghai and other institutions used operando scanning electron microscopy to observe the anode-electrolyte interface during charge-discharge cycles. They discovered that microscopic voids formed and grew at the interface, eventually causing the electrolyte to crack and the battery to short-circuit.

“Applying a small current in one direction may not lead to failure, but repeated cycles of charging and discharging can form structural defects, such as cracks, slip bands and voids,” the study concluded.

According to Naga Phani B. Aetukuri, an associate professor at the Indian Institute of Science, Bengaluru, “This work shows that cycling the cell at low rates, equivalent to applying a low stress multiple times, can also lead to cell failure.”

The findings suggest that the repeated stripping and plating of lithium on the anode creates stress, leading to mechanical fatigue and ultimately failure. While this discovery may not immediately change manufacturing processes, Aetukuri believes it will lead to more sophisticated and accurate battery models. Future research will focus on understanding how lithium’s stress-strain relationship changes with cycling rate and temperature to further improve SSB design and reliability. This is a crucial step towards realizing the full potential of solid-state batteries in a wide range of applications.

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