For the positive and negative electrodes, if we maintain the same material system as the current liquid battery, the energy density of the battery will not increase, and may even decrease. Because the energy density of the battery mainly depends on the positive and negative electrode materials, the solid electrolyte layer in the middle of the solid-state battery may be thicker and heavier than the diaphragm electrolyte, which leads to a decrease in energy density. Therefore, we must upgrade the positive and negative materials to increase the energy density of solid-state batteries.
However, from the perspective of battery PACK, even if a single solid-state battery has the same energy density as a liquid battery, the total energy density at the PACK level will still be higher than that of a liquid battery.
Of course, we still hope that the energy density of the single cell of the solid-state battery will also increase, so the positive and negative materials will be upgraded in the system. This does not mean that the upgraded positive and negative materials can only be used in solid-state batteries, they can also be used in liquid batteries, but what needs to be solved is the compatibility and cycle stability of the positive and negative materials with the liquid electrolyte after the update.
