In this video she said what I told you a few pages ago int this thread, that their solid electrolyte became dipole, align and form chains that are aligned with the electro-fild, the principle how a capacitor works.
Set the video timecode to 28:00 and watch for about 2 and half minutes. Even better if you watch up to 34:20.
And it's fair to presume they don't have all details about how it happen exactly in all ways, since it's difficuçlt to study inside a battery, and who said that was another scientist with some skeptcism. So, in case she don't have all answers in absolute details to fully convince the skepticals, it don't means she is lying or anything like that. Science takes time and patience.
Goodenough reputaion in this area it's a good signal things are very promissing.