EnerConnect project: Quick charging electric cars from household power outlets, made possible by innovative transistors
https://www.izm.fraunhofer.de/en/news_events/tech_news/enerconnect.html
"bidirectional blocking gallium nitride transistors, used with active converters/ rectifiers.... no separate conversion stage, 99% efficient, power dense... buck-boost converter works with higher or lower input voltages... lower voltage reduces transistor switching losses... 300 kHz switching frequency allows 15 kW per liter, 800% increased... compact converters on vehicles... perfect choice for the idea of using car batteries as storage for electricity and for use in photovoltaic systems"
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