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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That's 100X compared to TDK's previous product, which had already been far surpassed by competitors.
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.