As a battery researcher I can
As a battery researcher I can tell you Toyota's battery prototype may be exciting, but solid state is a decade from mass manufacturing. Solid state has many issues including low temperature charging, scalability, and cost. Ultimately solid state will most likely be a niche product and not a mass scale and broadly used EV battery because of these difficulties. Tesla is working on battery tech that can be scaled massively and they are now the largest battery company in the world, not Toyota who dismissed full EV and Tesla at their own loss(early shareholder, missed the massive increase in valuation)