Inside Batteries

In this short animation, I illusrate and article that presents a computer model designed to show how the internal structure of lithium-sulfur batteries affects their performance. The authors used X-ray scans to create a three-dimensional picture of a real battery electrode, including its sulfur particles, carbon material, and empty spaces filled with liquid.

They then used this digital structure to simulate how the battery behaves while it is discharging. Unlike simpler models that treat the electrode as uniform, this approach shows how different areas can have different reaction speeds, current levels, and amounts of sulfur being used. Some regions perform well, while others contain isolated sulfur that the battery cannot fully access.

The results show that the electrode’s small-scale structure has a major effect on battery capacity, efficiency, and ageing. The work suggests that designing electrodes with more even and better-connected internal pathways could improve lithium–sulfur batteries, although the model still simplifies some changes that occur inside the electrode during use.