Ahhh the super battery, perpetually just around the corner for the last 30 years at least... Just like commerical nuclear fusion and flying cars.
Either the physics is super hard (like fusion) or there's not really a big demand (flying cars)
Gasoline (and diesel) remain our best battery and until gone, there's not going to be real demand for a truly impressive battery.
The companies that have trillions invested in multi gigawatt gas, coal and oil power plants as well as the massively lossy transmission line infrastructure across the globe don't want you storing solar power at home. Germany has done good to buck that trend but they're a tiny influence to the global scale.