This is a peculiar marketing strategy.
This 'news' has been pushed about every month in the last ~6 months, and even before in 2021 there have been similar 'stories'.
But there is no battery. But they are near.
Here is one from 2021 : https://www.motortrend.com/news/toyota-battery-bev-hev-solid...
Enter the rabbit hole : https://hn.algolia.com/?q=toyota+battery