Thomas Gigl and Stefan Seidlmayer at the positron source NEPOMUC - Photo: Wenzel Schürmann / TUM
Research news - Rechargeable lithium batteries with cathodes comprising nickel, manganese, and cobalt, are viewed as the most potent today. But they, too, have a limited lifespan. Already in the first cycle they lose up to ten percent of their capacity. Why this happens and what can be done to alleviate the ensuing gradual loss of capacity has now been investigated in detail by a team of scientists using positrons at the Technical University of Munich (TUM). So-called NMC batteries, whose cathodes are made up of a mixture of nickel, manganese, cobalt and lithium have largely displaced conventional lithium-cobalt oxide batteries in the market. They are cheaper and safer, and are thus deployed in electric and hybrid cars, among other applications. But ultimately, less than 50 % of the lithium atoms contribute to actual capacity.
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