SAMSUNG SDI has unveiled the new name for its all-solid-state batteries, “SolidStack,” at InterBattery 2026, held at Coex in Seoul for three days starting March 11, drawing significant industry attention. The name combines “Solid,” referring to solid electrolyte, and “Stack,” a battery design technology, intuitively conveying both the characteristics of all-solid-state batteries and the company’s technological capability.

As we enter the era of physical AI, what makes the SolidStack stand out in the spotlight?

[SAMSUNG SDI unveiled prismatic and pouch-type all solid batteries, “SolidStack,” at InterBattery 2026.]

A battery consists of four key components: cathode, anode, separator, and electrolyte. All-solid-state batteries are primarily characterized by the use of a solid electrolyte.

Solid electrolytes offer many advantages, one of which is excellent safety. Liquid electrolytes in conventional batteries rely on flammable organic solvents. In contrast, solid electrolytes have a significantly lower risk of ignition.

Solid electrolytes can also enable higher energy density. They prevent direct contact between the cathode and anode and can potentially replace the separator. By utilizing the space that would otherwise be occupied by the separator, more active material can be added to the cathode and anode, increasing overall energy density. Additionally, solid electrolytes enable the use of high-energy-density materials such as lithium-metal and lithium-sulfur. These materials are difficult to apply in liquid- electrolytes batteries due to their high reactivity.

[The most notable characteristics of all-solid-state batteries are their high safety and energy density.]

Thanks to their excellent safety and high energy density, all-solid-state batteries are expected to be used across a wide range of sectors, including physical AI and EVs. In particular, physical AI requires high-performance computing and precise control simultaneously, yet the battery space is limited. As a result, the high energy density of all-solid-state batteries is attracting significant attention. 

SAMSUNG SDI is ramping up development of SolidStack, its all-solid-state battery, aiming for mass production in the second half of 2027. It has also diversified product portfolio by introducing a lightweight pouch-type all-solid-state battery for physical AI, alongside a prismatic all-solid-state battery for EVs, where safety is paramount. Beyond this, SAMSUNG SDI continues to focus on technological advancement and holds over 1,100 patents related to all-solid-state batteries. 

[SAMSUNG SDI’s all-solid-state battery, “SolidStack,” boasts its high energy density and can be applied across a wide range of sectors through various form factors.]

SAMSUNG SDI also continues to research next-generation technologies, including all-solid-state batteries, lithium-metal batteries, and lithium-sulfur all-solid-state batteries. We look forward to bringing safer, high-performance next-generation batteries to market through these efforts.