Korean Battery Tech Sets Stage for Seoul Humanoid Summit

The inaugural Humanoids Summit Seoul opens at COEX on September 22. While much attention focuses on artificial intelligence and software, the industry’s true bottleneck is power. South Korea arrives with a specific advantage in battery design that aligns perfectly with the mechanical needs of bipedal robots. This positioning allows Korean firms to integrate deeply into global supply chains that the United States and China are both competing to control.

Analysts from Goldman Sachs Research project that Korean companies will hold roughly 30% of the production market by 2035. This share includes both direct manufacturing and the supply of critical components like actuators and precision electronics. The forecast suggests Korean supply chains will support approximately 412,000 humanoid units by that year. These figures are estimates rather than confirmed orders, but they explain why major conglomerates and government ministries are coordinating their efforts toward this sector.

Walking Robots Need Different Power

The physical requirements of a walking robot differ significantly from those of an electric car. Bipedal locomotion demands intense, instantaneous power surges with every step to drive the joints in the hips, knees, and ankles. Simultaneously, the onboard computing hardware requires a steady, continuous power draw. A battery that can handle steady loads but cannot deliver sudden bursts of energy will cause the robot to stumble or shut down.

China dominates the market for lithium iron phosphate, or LFP, batteries. These cells are cheaper and thermally stable, making them ideal for electric vehicles that drive in a relatively smooth manner. However, LFP batteries have lower energy density, meaning they are larger and heavier for the same amount of output. For a compact humanoid robot, this extra weight is a severe engineering disadvantage that cost savings cannot offset.

Korean manufacturers, including Samsung SDI, LG Energy Solution, and SK On, have spent over a decade perfecting high-nickel ternary lithium cells. These NMC and NCA chemistries are better equipped to handle the high-burst power needs of robotics. Industry research firm TrendForce confirms that while LFP is common in stationary service robots, high-nickel cells are the dominant choice for full-body locomotion. This advantage is not easily replicated; it is the result of years of accumulated manufacturing knowledge and quality certification work.

Solid-State Tech Extends Operating Time

The next step in this technological race involves solid-state batteries. These cells replace liquid electrolytes with solid materials, which eliminates risks of leakage and thermal runaway. More importantly, they offer significantly higher energy density, potentially reaching 400 to 520 watt-hours per kilogram. This is a substantial jump from the 250 to 300 watt-hours per kilogram found in current high-nickel liquid cells.

This increase in density translates directly into longer working shifts. Current industry standards for humanoid robots allow for two to four hours of operation on a single charge. With solid-state technology, that window could expand to five to eight hours. Samsung SDI has identified humanoid robots as the primary target for its solid-state program, with mass production expected in late 2027. This shift addresses the main limitation of current robotics, which is their short battery life.

Supply Chain Integration and Risks

Korean firms are not just selling batteries; they are embedding themselves into the core of global humanoid programs. By supplying critical components to US-led initiatives and competing with Chinese manufacturers, they secure a foothold in the industry’s infrastructure. This strategy relies on maintaining the technical lead in high-nickel and solid-state chemistry.

However, this advantage comes with trade-offs. The production of high-nickel cells is more complex and expensive than LFP alternatives. Furthermore, the transition to solid-state batteries requires entirely new manufacturing processes and supply chains for materials like sulfide-based electrolytes. If competitors accelerate their own solid-state development or if the cost of high-nickel production remains too high, Korea’s current moat could narrow. The summit in Seoul will likely reveal how quickly these technical edges can be maintained against global competition.