Chinese researchers develop the first semi-solid-state EV battery with a massive 620-mile range — but questions remain

• New battery could dramatically increase EV range
• Semi solid-state chemistry boasts 30% greater energy density
• Higher density, reduced weight and a smaller form factor promised

Researchers from the Nankai University in Tianjin, China, have reportedly developed and tested a semi solid-state battery that delivers a 30% increase in energy density when compared to some of the leading lithium-ion batteries currently on sale.

According to an announcement by the researchers (via Live Science), the current iteration of its semi-solid-state battery pack delivers an energy density of 288 Wh/kg at the system level, when cooling systems, wiring, structural supports and safety hardware are considered.

The energy density of the pack in isolation is said to be 500 Wh/kg, while scientists say they are already working on iterations could exceed 340 Wh/kg at the pack level.