SVOLT claims to have developed and successfully tested 20Ah batteries with a solid electrolyte based on sulphides. These elements provide an energy density of 350 to 400 Wh/kg. According to extrapolation, this should provide a range of more than 1000 kilometers for later series cells in an electric vehicle.
The tests that the 20Ah cell prototype has already undergone are reported to include a nail penetration test common in China and heating the battery cell to 200 degrees Celsius. In both cases, the results are not directly mentioned - it only means that these tests were passed successfully.
The cell with a capacity of 20 Ah belongs to the fifth generation. Starting from the mAh range one to five Ah, the capacity was initially increased to 10 and now to 20 Ah. The cell is being developed at the SVOLT Solid State Battery Laboratory. It is a laboratory created by the merger of SVOLT Wuxi Lithium Battery Innovation Center and Ningbo Institute of Materials Science and Engineering.
But progress is also evident in scaling up production. Thus, the synthesis of an electrolyte material based on sulfides is already in the kilogram range, which is still far from the volumes required for mass production. In addition, the continuous production of an electrolyte film is a challenge.
According to SVOLT, there are currently 109 patents registered in the field of solid-state sulfide batteries.