I was wondering the same. It doesn't look like it's only AKE, though.
My SYR and LPD are down a bit as well.
The whole lithium sector seems going down today (ACDC ETF is down 2.5%).
That it goes down further than 10% could be because selling positions got triggered?
Maybe the positive news from China was a little bit too well received and it's just bouncing back.