DIY oxygen concentrator using lithium from batteries

https://medicalxpress.com/news/2020-04-cost-effective-oxygen.html

Sample quote

The problem is that Lithium X-zeolite is expensive and only highly specialized companies offer this material. Stark and his team have therefore produced the microporous material themselves from a desiccant—a drying agent—and lithium batteries—at home in their spare rooms that they converted into makeshift research laboratories. Stark and his team have calculated that three good laptop batteries can produce enough Lithium for a patient ward.

End quote