Ion Storage Systems introduces a strong, dense ceramic electrolyte. This electrolyte is only 10 microns thick, which is the same thickness as the plastic separators currently used in lithium-ion batteries; and like current liquid electrolytes, it can conduct lithium ions. Eric Wachsman, CEO of the company, said it overcomes two key problems with solid-state batteries: high electrolyte resistance and low ampacity.
This type of electrolyte is divided into three layers, the middle layer is a thin and dense lithium oxide ceramic (chemical formula is Li7La3Zr2O12), and on both sides is a slightly thicker porous ceramic layer. The ultra-thin alumina coating on the porous ceramic layer helps to further reduce resistance.
Wachsman said: "The unique structure and interface treatment method is conducive to reducing resistance. High resistance has always been a problem for solid-state batteries." Because lithium ions are smoothly transmitted between the electrode and the electrolyte, the battery current density is as high as 10mA / Cm2. Moreover, the battery can be quickly charged without generating dendrites. "It takes about 5 to 10 minutes. This is unprecedented for a solid electrolyte." In addition, the energy density of the company's prototype battery is about 300Wh / kg. At present, the maximum energy density of commercial lithium-ion batteries is 250wh / kg.