The Samsung Advanced Institute of Technology unveiled a study of a solid-state battery that can run 800 km on a single charge and can be safely re-charged more than 1,000 times. This is the result of a joint research with the Samsung R&D Institute of Japan. This all-solid-state battery replaces the electrolyte between the battery's positive and negative electrodes from liquid to solid and is capable of implementing larger-capacity cells and increasing safety compared to lithium-ion batteries currently in use.In general, Li-metal is used as an anode material of an all-solid-state battery. However, lithium metal has a technical challenge to solve the "dendrite" problem that reduces the life and safety of the all-solid-state batteries. Dendrites are branch-shaped crystals that appear when lithium, which moves from the positive electrode to the negative electrode, accumulates on the negative electrode surface when the battery is being charged. This crystal damages the battery's separator, resulting in reduced lifetime and safety.In order to solve the problem with the dendrites, Samsung Electronics applied an "Ag-C nanocomposite layer" of 5 micrometers to the battery cathode. This is done for the first time in the world. This technology not only increases the safety and lifespan of all-solid-state batteries but also reduces the size of the lithium-ion batteries by half because they can increase the energy density by making the battery negative electrode thinner than before.Lim Dong-min, a master at the Samsung Advanced Institute of Technology, said, "This research is a key source technology that will increase the mileage of electric vehicles innovatively."