It looks like it’s not so much a breakthrough than an ongoing research that aims at producing this kind of results at scale:
https://green-innovation.nedo.go.jp/en/article/liquid-lithiu...
“While these targets have already been achieved at the laboratory level, we are now moving into the phase of mid-scale demonstration,”
https://green-innovation.nedo.go.jp/en/article/liquid-lithiu...
“While these targets have already been achieved at the laboratory level, we are now moving into the phase of mid-scale demonstration,”