A business built for a rapidly expanding electric-vehicle market is being pulled back inside its parent company after the growth curve failed to match the investment. SK Innovation has approved a merger with SK IE Technology, or SKIET, bringing the battery-separator maker back under the parent as a directly operated business after years of mounting losses.
The decision reflects a broader challenge facing parts of the EV supply chain. Global electric-car sales are still growing, but demand has become uneven across regions, while manufacturers that invested aggressively during the boom are dealing with unused capacity and fierce Chinese competition. For SKIET, those pressures have translated into heavy operating losses, plant restructuring and tighter financing conditions. SK Innovation is betting that a larger balance sheet, shared research capabilities and lower overhead can give the separator operation more time to recover.
SK Innovation Is Folding SKIET Back Into the Parent
SK Innovation and SKIET approved the merger at separate board meetings on August 25, 2026. SK Innovation will survive as the combined company, while SKIET will cease to exist as a separate listed corporate entity once the transaction is completed. The merger ratio is 1 SK Innovation share for every 0.1174540 SKIET share. Under the proposed schedule, SKIET shareholders are expected to vote on the transaction on November 24, while SK Innovation can use a small-scale merger procedure under Korean corporate law rather than holding a conventional shareholder meeting. The effective merger date is scheduled for January 1, 2027.
In practical terms, the move reverses part of a corporate separation that began seven years earlier. SKIET was established in 2019 when SK Innovation spun off its materials operation, creating a specialist company focused largely on lithium-ion battery separators. It later listed on South Korea’s KOSPI in May 2021, when enthusiasm for EV supply-chain companies was running high. The new structure effectively acknowledges that independence has become more difficult to sustain. SK Innovation says the objective is to improve financial stability, cut structural costs and manage the separator operation’s risks more directly.
The Losses Have Become Too Large to Ignore
SKIET’s financial deterioration explains why the restructuring has become urgent. The company earned an operating profit of about 50.1 billion won in 2023. One year later, it recorded an operating loss of roughly 291 billion won as annual revenue plunged by more than 66% to 217.9 billion won. The losses continued in 2025, when SKIET reported approximately 261.9 billion won in revenue and a 246.3 billion won operating loss. Its net loss for that year reached about 211.4 billion won. Those figures turned what could once have been treated as a cyclical downturn into a balance-sheet problem requiring a deeper response.
The first half of 2026 offered little immediate relief. SK Innovation says SKIET generated just 75.4 billion won in revenue during the six-month period while recording an operating loss of 136.7 billion won. In other words, the operating loss was substantially larger than the revenue generated during the period. SK Innovation has also acknowledged that weaker profitability has reduced SKIET’s ability to generate cash and secure financing as a standalone company. For factories designed around high utilization, prolonged stretches of weak demand can be especially painful because depreciation, labour, maintenance and financing costs continue even when production lines are running well below their intended capacity.
The EV Slowdown Is Real, but It Is Not a Global Collapse
The backdrop requires some nuance. Electric-car demand has not disappeared. The International Energy Agency estimates global electric-car sales increased 20% in 2025 to more than 20 million vehicles, representing roughly one-quarter of all new cars sold worldwide. Yet the geographic picture became increasingly uneven. In the first quarter of 2026, global electric-car sales totaled about 3.9 million, down 8% from the same period of 2025, largely because of weaker sales in China and the United States following policy changes. Europe, by contrast, recorded year-over-year growth of nearly 30%.
The IEA still expects around 23 million electric cars to be sold globally in 2026, equivalent to approximately 28% of the new-car market. That means the problem confronting companies such as SKIET is less about the disappearance of EVs than the mismatch between earlier investment assumptions and today’s demand pattern. Battery-material factories were often planned years in advance on expectations of steep, relatively predictable growth. When automakers delay projects, change battery suppliers or sell fewer EVs than forecast in specific markets, upstream suppliers can suddenly be left with expensive factories waiting for orders that arrive more slowly than expected.
Chinese Competition Is Adding a Second Layer of Pressure
Slower demand would be difficult enough on its own, but SK Innovation has specifically identified intensifying price competition from expanding Chinese competitors as another reason SKIET’s standalone model has become harder to maintain. China’s battery industry has developed enormous scale across cells, materials and manufacturing equipment, giving suppliers opportunities to spread costs across much larger production volumes. For Korean and Japanese battery-material companies, competing against those economics has become increasingly challenging, particularly when their own factories are operating below capacity.
The broader numbers illustrate the imbalance. According to the IEA, China accounted for more than 80% of global battery-cell production in 2025 and held even larger shares of capacity in several active battery-material stages. Chinese companies also supplied around 60% of electric cars sold globally that year. SKIET competes in the separator segment rather than battery-cell assembly itself, but it operates inside the same increasingly China-centred ecosystem. Lower prices from high-volume competitors can force suppliers elsewhere to choose among reducing margins, cutting production, finding differentiated products or consolidating. SK Innovation’s merger plan combines elements of the latter three approaches: cost reduction, technology development and a search for new separator markets beyond passenger EVs.
SKIET Was Already Shrinking and Rebuilding Its Factory Network
The merger follows months of physical restructuring. In May 2026, SKIET announced plans to sell its Chinese production operation to Chinese separator manufacturer SEMCORP for approximately 88.8 billion won. It also decided to end commercial production at its aging Jeungpyeong facility in South Korea by the end of the year. The Korean plant had operated for more than 15 years, and SKIET cited aging equipment, low utilization and worsening economics. Rather than abandoning the site completely, the company has considered converting it into a research centre and pilot facility for next-generation separator materials.
Production is increasingly being concentrated in Poland. SKIET’s first Polish plant, completed in 2021, has annual separator capacity of roughly 340 million square metres. A second plant of similar size was scheduled to begin operations by the end of 2026. SKIET has also pursued additional Polish expansion, although earlier timetables for later phases were delayed as industry conditions weakened. If its full four-plant Polish plan is eventually completed, SKIET has said annual capacity there could reach about 1.54 billion square metres—enough separator material for roughly 1.75 million electric vehicles. Concentrating production around newer facilities could raise utilization while reducing the fixed-cost burden carried by older sites.
A Separator Is a Small Component With an Outsized Job
Battery separators rarely receive the attention given to cathodes, lithium or battery cells, but their function is fundamental. The separator is a thin membrane positioned between a lithium-ion battery’s positive and negative electrodes. It prevents direct electronic contact between the two sides—which could cause an internal short circuit—while still allowing lithium ions to move through the electrolyte as the battery charges and discharges. SKIET has specialized in thin and ceramic-coated separator products designed for lithium-ion batteries, making the business strategically connected to the safety and performance of the larger SK battery ecosystem.
That helps explain why SK Innovation is not simply abandoning the operation despite its losses. The company says integration should reduce the risk of separator supply disruptions to important customers while allowing SK Innovation’s research organization to work more closely with SKIET’s product-development specialists. Management is also looking beyond conventional EV demand. SK Innovation has identified energy-storage systems, electric vehicles and robotics as areas for continued separator research, with ESS sales receiving particular attention after the merger. That diversification matters because stationary batteries can provide another source of demand when passenger-EV orders are volatile.
The Merger Improves the Financial Safety Net, Not the Market Overnight
SK Innovation has been careful not to present the deal as an instant accounting cure. Because SKIET is already included in SK Innovation’s consolidated financial statements, the company says the merger’s immediate effect on consolidated financial metrics should be limited. The longer-term argument is about removing duplicated administrative expenses, reducing financing costs and allowing SKIET’s operations to rely on the broader group’s financial resources. SK Innovation expects integration to improve cash-flow generation and create a more stable platform from which the separator business can attempt a profitability recovery.
There is also a shareholder test ahead. The legally calculated merger values were set at 125,862 won per SK Innovation share and 14,783 won per SKIET share, producing the 1-to-0.1174540 exchange ratio. SK Innovation says an independent external valuation firm appointed by a special committee also reviewed the terms. The transaction is scheduled to become effective January 1, 2027, following the November approval process and creditor-protection period. What happens after that will depend less on corporate paperwork than factory utilization, customer orders and pricing. The merger can buy financial resilience, but sustainable profitability will still require the separator business to become competitive in a market that has changed dramatically since SKIET was spun off in 2019.
