The Ars article linked below seems to indicate about 20x vs competing solid-state products and 2.5x vs liquid electrolyte batteries.
"The new material provides an energy density...1,000 watt-hours per liter, which is about 100 times greater than TDK’s current battery in mass production. Since TDK introduced it in 2020, competitors have moved forward, developing small solid-state batteries that offer 50 Wh/l, while rechargeable coin batteries using traditional liquid electrolytes offer about 400 Wh/l, according to the group. "
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How far? I.e. do we know what is the improvement (if any) vs competing products?
The Ars article linked below seems to indicate about 20x vs competing solid-state products and 2.5x vs liquid electrolyte batteries.
"The new material provides an energy density...1,000 watt-hours per liter, which is about 100 times greater than TDK’s current battery in mass production. Since TDK introduced it in 2020, competitors have moved forward, developing small solid-state batteries that offer 50 Wh/l, while rechargeable coin batteries using traditional liquid electrolytes offer about 400 Wh/l, according to the group. "
While not 100x, a 20x improvement still sounds like a solid (heh) breakthrough in my book, to be fair.
The important thing to know here is that Li-ion batteries are not solid state, they've got a gel in them.
TDK are claiming this new solid state battery provides "1000 watt-hours per liter"
Whereas for comparison a Panasonic Li-ion battery like a UPF496171Z offers 650 watt hours per litre.
So compared to competing Li-ion batteries, they're claiming a 50% improvement in energy density.