Thank you for visiting nature.com. You are using a browser version with limited support for CSS. To obtain
the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in
Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles
and JavaScript.
Rechargeable Li-ion batteries play a key role in the energy transition towards clean energy. It is challenging for end users to ensure that Li comes from environmentally and responsible sources. Here the authors show that Li isotope ‘fingerprints’ are a useful tool for determining the origin of Li in battery.