South Korea is positioning itself as the critical battery supplier for the global humanoid robot industry, not through government mandates but through a technical advantage rooted in a decade of automotive manufacturing expertise. Goldman Sachs Research estimates that Korean companies will command roughly 30% of humanoid robot production by 2035, both through direct manufacturing and by supplying critical components including actuators, batteries, and precision electronics to programs led by the US and China.

Why Does Battery Chemistry Matter So Much for Walking Robots?

The conventional narrative around the US-China-Korea robotics competition focuses on capital, talent, and artificial intelligence capability. What it frequently overlooks is a fundamental physics constraint: humanoid robots walk differently than electric vehicles drive, and that difference determines which country's battery industry is best positioned to supply them.

Bipedal locomotion requires intense, instantaneous power surges. Every step forces a burst of current through the actuators controlling hip, knee, and ankle joints, while onboard AI compute draws sustained power continuously. The battery chemistry that handles this best is the high-nickel ternary lithium cell, specifically the nickel-manganese-cobalt (NMC) and nickel-cobalt-aluminum (NCA) families that Korea's Samsung SDI, LG Energy Solution, and SK On have spent more than a decade perfecting for automotive-scale electric vehicle production.

China dominates lithium iron phosphate (LFP) batteries, a chemistry that is more affordable and thermally stable, and that has made Chinese battery companies the world's largest EV suppliers. But LFP's lower energy density means a physically larger, heavier battery pack for the same output. For a humanoid robot operating in a compact form factor and needing both high-burst and sustained power, LFP's cost advantage cannot compensate for its engineering limitations. Industry research firm TrendForce confirms that LFP batteries are "mainly used in service robots" that do not require high endurance, while high-nickel NMC/NCA cells are the dominant power source for humanoid robots requiring full-body locomotion.

What Makes Korea's Battery Advantage Difficult to Replicate?

This is the technical foundation of South Korea's battery moat. It is not an advantage that can be closed by redirecting investment from LFP to NMC/NCA production overnight. It is built from a decade of manufacturing process knowledge, supply chain relationships, and quality certification work accumulated for the automotive market that now translates directly into humanoid robot supply.

The Korean government is now building an institutional framework around this supply-chain position to accelerate the move from component supply to full-platform capability. In May 2026, the Ministry of Science and ICT formally launched the "AI Humanoid" program, which explicitly targets applying solid-state battery technology to its KAPEX humanoid platform.

Goldman Sachs Research projects that Korean supply chains will support approximately 74,000 humanoid units by 2030 and 412,000 by 2035. These are forecasts, not orders, but they explain why Korean manufacturers, government ministries, and the country's biggest conglomerates are all moving in the same direction at the same time.

How Will Solid-State Batteries Change the Game?

If high-nickel liquid cells are South Korea's current advantage, solid-state batteries represent the next stage in that moat's construction. Solid-state cells replace liquid electrolytes with solid materials, eliminating the thermal runaway and leakage risks of conventional cells while pushing energy density toward 400 to 520 watt-hours per kilogram, compared to 250 to 300 watt-hours per kilogram for NMC cells.

That energy density improvement could extend humanoid operating time from the current industry-typical two to four hours to five to eight hours on a single charge. Samsung SDI has identified humanoid robots as the most likely first commercialization target for its solid-state battery program, with mass production set for late 2027. EcoPro BM, a materials supplier, operates a sulfide-based solid electrolyte pilot plant and says its products have passed quality verification with major battery companies. SK On has advanced its solid-state commercialization timeline from 2030 to 2029. LG Energy Solution is targeting 2030 for next-generation humanoid applications.

TrendForce projects that demand for solid-state batteries in humanoid robots could exceed 74 gigawatt-hours by 2035, a more than 1,000-fold increase from 2026. A trajectory that, if realized, would cement Korean battery chemistry as the structural supply-chain anchor for the entire global humanoid industry.

What Role Do Actuators Play in Korea's Supply-Chain Advantage?

Batteries address the energy problem. Actuators address the movement problem, and here Korea's automotive supply chain delivers an equally potent advantage. Actuators convert electrical signals into physical motion. In a humanoid robot, each joint requires a dedicated actuator precise enough to maintain balance under unpredictable loads while responding to control signals in milliseconds. Actuators account for more than 60% of a humanoid robot's total material cost, and each robot requires between 30 and 50 of them.

The technical overlap with automotive components is substantial. Electric power steering systems require the same precision position control under varying loads as a robot knee joint. Active suspension actuators handle the same dynamic load management as a robot hip. Korean companies that built those systems for tens of millions of cars bring the engineering knowledge and, critically, the manufacturing quality infrastructure to produce robot actuators at automotive scale.

Hyundai Mobis, the parts arm of Hyundai Motor Group, formalized this connection at CES 2026 in January, announcing a strategic collaboration with Boston Dynamics to supply actuators for Atlas, the company's next-generation humanoid. The deal made Hyundai Mobis the first official Korean robotics customer in Boston Dynamics' supply chain. Hyundai plans to establish US-based actuator manufacturing capacity exceeding 350,000 units annually by 2028, targeting Atlas production of 30,000 units per year.

Steps to Understanding Korea's Strategic Position in Humanoid Robotics

• Battery Chemistry Advantage: Korean companies have spent over a decade perfecting high-nickel NMC and NCA battery production for electric vehicles, giving them a structural advantage in supplying humanoid robots that require intense, instantaneous power surges for bipedal locomotion.
• Actuator Manufacturing Expertise: Korean automotive suppliers like Hyundai Mobis and HL Mando have already established supply-chain relationships with major humanoid developers, leveraging their experience building precision components for electric power steering and active suspension systems.
• Next-Generation Solid-State Technology: Samsung SDI, SK On, and LG Energy Solution are all advancing solid-state battery commercialization timelines, with Samsung targeting late 2027 for mass production and demand projected to exceed 74 gigawatt-hours by 2035.

As Goldman Sachs analyst Do Hyoung Kim noted in the bank's June 2026 Korea humanoid report, Korean companies will "eventually see a greater role" in becoming the key supplier for non-China-related humanoids. Among the positives for Korean companies is the fact that they are "on the radar" of US companies that are developing humanoid robots.

The Humanoids Summit Seoul, opening on September 22, will bring together the global humanoid robotics industry at a moment when South Korea's supply-chain position is becoming impossible to ignore. The country's advantage is not the result of government planning alone; it emerged from decades of industrial development in automotive manufacturing. But the South Korean government is now building an institutional framework around it to accelerate the move from component supply to full-platform capability, positioning the nation as a critical infrastructure player in the emerging humanoid economy.