Anyone for potassium ion batteries?

Potassium can work with graphite in a potassium-ion battery, claims Oregon State University, which said the last time this possibility was explored was in 1932.
“For decades, people have assumed that potassium couldn’t work with graphite or other bulk carbon anodes in a battery,” said chemist Xiulei Ji. “That assumption is incorrect. It’s really shocking that no one ever reported on this issue for 83 years.”
That said, potassium is a big atom to get into graph