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17-Dec-2012

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Ohio State Researchers Identify Why Lithium Batteries Age

Build up of lithium ions on both electrodes reduce the battery's ability to store electric charge.

The lithium-ion batteries commonly used in hybrid and electric-only cars could fail earlier than expected because of a newly-discovered problem with the current collector.

Researchers led by Ohio State University engineers examined used car batteries and discovered that over time lithium accumulates beyond the battery electrodes, in the current collector - a sheet of copper which facilitates electron transfer between the electrodes and the car’s electrical system.

"Our study shows that the copper current collector plays a role in the performance of the battery," says Professor Bharat Bhushan.

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