Toyota last week announced a partnership with energy group Idemitsu Kosan to jointly develop and produce a solid-state battery material called sulphide solid electrolyte, which the companies said was most promising in addressing the durability issue.

I won't put too much hope considering so mucn time they've wasted ignoring the EV market. However, given that they are having a partnership with Idemitsu Kosan, they might be up to something.