Korean Batteries Are Still Strong—But the Profit-Draining Weak Link Is Becoming Impossible to Ignore
If you spend enough time watching the battery industry, there’s a scene that jumps out before the numbers do. When cell makers stand front and center taking the applause, it’s the lower layers behind them—precursors, nickel refining, graphite—that really determine who captures the profits and the bargaining power. The reality of Korea’s secondary battery industry today is this: the cells are strong, but several key parts of the materials chain are missing.
If you cherry-pick the good news, there’s plenty to talk about. There’s LG Energy Solution, Samsung SDI, and SK On, while Ecopro BM, L&F, and POSCO Future M have a clear presence in high-nickel materials. But the gaps are wide in LFP, precursors and nickel refining, natural and synthetic graphite, CTP/CTC, and dry electrode processing. This isn’t just a disappointing weak spot. It’s where the money is leaking out.
Pretend the money is made in cells, but it actually leaks out of—or stays in—materials
The picture gets much clearer when you read the value chain in order. It starts with raw materials and minerals, moves through precursors/cathodes, anodes, separators, and electrolytes/lithium salts, then climbs up to cells/modules/packs and BMS/systems, before finally looping back through recycling. On the surface, cell makers look like kings. In reality, though, upstream input costs and process choices decide almost everything.
Battery margins are not protected by cell assembly technology alone. More than half of competitiveness comes down to whose hands touch the intermediates—things like precursors, nickel refining, graphite, and electrolytes/additives. That’s why even the same cell company can become a completely different company depending on which cathode it uses, which anode it uses, and how it configures the pack. Miss that, and you end up investing by looking at the numbers alone.
| Stage | Description | Subsegments |
|---|---|---|
| Raw materials/ minerals | Core battery minerals (lithium, cobalt, nickel, graphite, manganese) | Lithium, cobalt/nickel, graphite/silicon, manganese/iron, mining/smelting |
| Precursors/ cathodes | Cathode materials (NCM, NCA, LFP) and precursors | Precursors, NCM cathodes, NCA cathodes, LFP cathodes, next-generation cathodes |
| Anodes | Anode materials (graphite, silicon, next-generation) | Natural graphite, synthetic graphite, silicon anodes, lithium metal/next-generation |
| Separators | Separators (wet, dry, ceramic-coated) | Wet-process separators, dry-process separators, ceramic-coated separators |
| Electrolytes/ lithium salts | Electrolytes, lithium salts, and next-generation electrolytes | Electrolytes, lithium salts, solid electrolytes, additives |
| Cells/modules/packs | Battery cells, modules, and packs (Korea’s big three + China’s CATL/BYD) | Pouch cells, prismatic cells, cylindrical cells (4680), module/pack assembly, next-generation cells (solid-state) |
| BMS/ systems | BMS (battery management systems) and integrated systems | BMS hardware, BMS software/AI, ESS systems, thermal management |
| Recycling | Battery recycling (black mass recovery moving into full swing) | Preprocessing/disassembly, black mass recovery, hydrometallurgy, pyrometallurgy, second-life ESS |
What Korea does well, it does exceptionally well—but the empty spaces hurt
We shouldn’t throw around the word “localization” too casually. Korea is not a country that is uniformly strong across every part of the value chain. Instead, it is deeply entrenched in a few high-performance segments. The real question is whether those strengths line up neatly with where the mass market is heading.
Let’s start with the areas where Korea leads. In high-nickel NCM/NCA, EcoPro BM, L&F, and POSCO Future M are holding the line. In single-crystal cathodes, EcoPro BM, LG Chem, and POSCO Future M deserve mention. In silicon anodes, there are Daejoo Electronic Materials, Hansol Chemical, and SK Materials Group14. In lithium-metal anodes, LG Energy Solution and SK On are the key players. Electrolytes and additives are also covered by Enchem, Dongwha Electrolyte, and Soulbrain. Korea’s strengths are concentrated in high-energy-density, high-performance materials.
On the flip side, the weak spots are hard to excuse. LFP trails by 3, precursor and nickel refining by 2, natural and synthetic graphite by 2, CTP/CTC by 2, and dry-electrode processing by 2. Why is this mix so concerning? Because the deeper the market moves into mass adoption, the more important LFP and CTP/CTC become. And the more competition shifts toward cost, the more control over precursors, nickel refining, and graphite starts to matter. Korea is closer to being a country that makes expensive batteries very well, while the system for making cheap batteries at scale still feels underbuilt. Put kindly, that’s focus and selectivity. Put bluntly, it means parts of the chain are still in someone else’s hands.
Table below: Domestic vs. global TRL (technology readiness level 1–9) by technology, and key companies
| Technology | Domestic | Global | Assessment | Key companies | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cathode materials | ||||||||||||||||||||||||||||||||||
| High-nickel NCM/NCA | 9 | 9 | Strong · Gap 0 | EcoPro BM, L&F, POSCO Future M | ||||||||||||||||||||||||||||||
| This is the “positive electrode” powder that stores and releases electricity in a battery, and it is the single most expensive core material determining how much energy the battery can hold. During charging, lithium ions (Li+) leave the cathode and move to the anode; during discharge, they return to the cathode. The more lithium the cathode can host, the larger the capacity. It is made by combining nickel, cobalt, and manganese (NCM), and when the nickel ratio is pushed above 90%, the same weight can store more electricity, extending EV driving range. The tradeoff is that higher nickel content makes the crystal structure less stable during charge and discharge, increasing heat generation and fire risk as oxygen is released. That is why cobalt is used to stabilize the structure, or aluminum (NCA) and manganese are added for the same purpose. Korea’s big three battery players currently lead the “high nickel = premium EV” formula, and the next key battleground is cobalt-free chemistries that reduce or eliminate expensive cobalt. | ||||||||||||||||||||||||||||||||||
| Single-crystal cathode | 7 | 7 | Strong · Gap 0 | EcoPro BM, LG Chem, POSCO Future M | ||||||||||||||||||||||||||||||
| Cathode powder is usually built like a “bunch of grapes,” with hundreds of tiny primary particles clustered together. Repeated charge-discharge cycles cause cracks to form along those particle boundaries, allowing electrolyte to seep in and shortening battery life quickly. A single-crystal cathode eliminates that weak point by making the material into one large, solid particle—essentially a bead—with no internal boundaries to crack. Because the particles do not fracture easily, gas generation and heat buildup are reduced, improving both lifespan and safety, and the material can better withstand high-voltage charging. The downside is that lithium has a longer path to travel in and out, which can slightly reduce power output, so particle size control and doping are used to compensate. Single-crystal cathodes paired with high nickel are increasingly becoming the next standard, and Korean cathode makers are ramping up mass production. | ||||||||||||||||||||||||||||||||||
| LFP (lithium iron phosphate) | 6 | 9 | Caution · Gap 3 | LG Energy Solution, EcoPro BM, POSCO Future M | ||||||||||||||||||||||||||||||
| This cathode chemistry uses cheap iron (Fe) and phosphorus (P) instead of nickel and cobalt, making it the core of the “value-for-money battery.” It stores only about 70% as much energy as high-nickel chemistries, so driving range is shorter, but its crystal structure is robust, it resists fire well, lasts through thousands of charge-discharge cycles, and costs less. The safety advantage comes from the phosphate framework, which holds oxygen tightly and does not release it easily even at high temperatures, reducing fire risk. As China pulled ahead in entry-level EVs and energy storage systems (ESS) with LFP, Korea has also moved in earnest into mass production of LFP for ESS and mainstream applications in 2025–2026. The key trend to watch is how cell-to-pack structures help offset LFP’s shorter range. | ||||||||||||||||||||||||||||||||||
| Precursors and nickel refining | 6 | 8 | Catching up · Gap 2 | POSCO Future M, EcoPro Materials | ||||||||||||||||||||||||||||||
| Precursors are the “dough” used just before cathode material is made. Nickel, cobalt, and manganese are dissolved in water, mixed in fixed ratios, and then solidified again through a coprecipitation reaction. Because the shape, size, and uniformity of cathode particles are determined at this stage, more than half of final cathode quality is effectively decided here. Lithium is then added and the material is fired at high temperature to become cathode material. Today, a significant share of precursors is still imported from China, but the U.S. IRA and critical mineral rules can block subsidies if Chinese content is too high, making localization urgent. POSCO Future M and EcoPro Materials are increasing domestic investment in precursors and nickel refining to internalize the supply chain. | ||||||||||||||||||||||||||||||||||
| Anode materials | ||||||||||||||||||||||||||||||||||
| Natural and synthetic graphite | 7 | 9 | Catching up · Gap 2 | POSCO Future M | ||||||||||||||||||||||||||||||
| This is the battery’s “negative electrode” material. During charging, it acts like a parking lot, neatly inserting lithium ions arriving from the cathode between graphite layers (intercalation), then releasing them again during discharge. The material is graphite—the same basic substance as pencil lead—and its layered structure makes it ideal for stably hosting and releasing lithium. Natural graphite is mined and processed, while synthetic graphite is made by firing petroleum byproducts (coke) at close to 3,000°C, producing a more uniform and durable material. The problem is that China controls roughly 90% of the chain from raw material mining to processing and even holds the export-control card, making this one of the highest-risk supply-chain items. POSCO Future M is the only domestic producer mass-producing synthetic graphite anodes, helping diversify the supply chain. | ||||||||||||||||||||||||||||||||||
| Silicon anode | 6 | 7 | Strong · Gap 1 | Daejoo Electronic Materials, Hansol Chemical, SK Materials Group14 | ||||||||||||||||||||||||||||||
| Using silicon instead of graphite in the anode allows the battery to hold far more lithium—roughly 10 times more lithium per unit weight. Graphite holds one lithium for every six carbon atoms, while silicon can hold about 3.75 lithium per silicon atom. That translates into much better driving range and fast-charging performance. The problem is that when lithium enters during charging, silicon swells like a balloon to three to four times its original size, then shrinks again during discharge. Repeating that cycle causes particles to crack and electrical connections to break. That is why commercialization began with approaches such as breaking silicon into nanoscale particles, coating it with carbon, or blending just 5–10% into graphite, with the silicon content gradually increasing over time. Daejoo Electronic Materials is already among the global leaders and has moved early to capture the high-content silicon anode market. | ||||||||||||||||||||||||||||||||||
| Lithium-metal anode | 4 | 5 | Strong · Gap 1 | LG Energy Solution, SK On | ||||||||||||||||||||||||||||||
| This is the ultimate anode concept: making the anode out of lithium metal itself, without a “container” like graphite or silicon. Since there is no separate parking lot for lithium, weight and volume shrink, and theoretical gravimetric energy density becomes the highest possible. The problem is that during charging, lithium does not deposit evenly on the anode surface. Instead, it grows into sharp, branch-like structures called dendrites. If those branches pierce the separator and touch the cathode, they can cause short circuits and fires. Lithium is also highly reactive, continuously attacking liquid electrolyte and shortening battery life. That is why lithium-metal anodes need to be paired with solid electrolytes that can physically block dendrites, making them a natural match for all-solid-state batteries. Commercialization is generally expected in the 2030s. | ||||||||||||||||||||||||||||||||||
| Electrolytes and separators | ||||||||||||||||||||||||||||||||||
| Electrolyte and additives | 7 | 8 | Strong · Gap 1 | Enchem, Dongwha Electrolyte, Soulbrain | ||||||||||||||||||||||||||||||
| Electrolyte is the “liquid road” inside the battery that allows lithium ions to swim back and forth between the cathode and anode. It is made by dissolving a lithium salt (LiPF6) in an organic solvent. It must allow ions to pass while blocking electrons, otherwise the battery would short-circuit. On top of that, additives—used at just 1–5%—form a protective SEI layer on the anode surface and have an outsized impact on lifespan, safety, fast charging, and low-temperature performance. That is why the type and ratio of additives are each company’s “secret recipe.” Domestic electrolyte production has expanded significantly, but lithium salt, the key raw material, still depends heavily on China, making localization a remaining challenge. Enchem has grown into a global top-tier player through capacity expansion in the U.S. and Europe, lifting the profile of Korean electrolytes. | ||||||||||||||||||||||||||||||||||
| Separator | 7 | 8 | Strong · Gap 1 | WCP, SK IE Technology | ||||||||||||||||||||||||||||||
| If the cathode and anode touch directly, the result is an immediate short circuit and fire. So the separator is a thin membrane full of microscopic pores that keeps the two apart while still allowing lithium ions to pass through. It is the last line of defense for fire safety, and the core technology lies in uniformly creating nanometer-scale pores in a film just one-tenth the thickness of a human hair—only a few to a dozen micrometers thick. It also has a shutdown safety function: if temperature rises abnormally, the pores close, cutting off ion movement and slowing thermal runaway. Ceramic-coated “high-heat-resistant separators” go a step further by resisting tearing even at higher temperatures, improving safety further. SK IE Technology and WCP are competing with Japan’s Toray in the global top tier, and tighter safety regulations are rapidly increasing the share of coated separators. | ||||||||||||||||||||||||||||||||||
| Solid electrolyte | 4 | 5 | Strong · Gap 1 | Samsung SDI, EcoPro BM, POSCO JK Solid Solution | ||||||||||||||||||||||||||||||
| This material replaces today’s liquid electrolyte “road” with a solid one, making it the key determinant of whether all-solid-state batteries succeed. Liquids burn easily and can leak; solids do neither, making them much safer. Because they are rigid, they can also physically block lithium dendrites from penetrating through. Broadly, there are sulfide-based systems, which have the highest ionic conductivity but are vulnerable to air and moisture and can generate toxic gas, and oxide-based systems, which are more stable but so hard that interface bonding is difficult. Korea has focused primarily on the higher-energy-density sulfide route. The hardest challenge is making a material that is “solid, yet lets lithium move through it almost as easily as a liquid,” while also achieving tight contact with cathodes and anodes and scaling that up to mass production. Samsung SDI and POSCO JK Solid Solution are preparing mass production of sulfide-based solid electrolyte materials, with Korea and Japan locked in fierce competition. | ||||||||||||||||||||||||||||||||||
| Cells, packs, and BMS | ||||||||||||||||||||||||||||||||||
| Prismatic / pouch / cylindrical cells | 9 | 9 | Strong · Gap 0 | LG Energy Solution, Samsung SDI, SK On | ||||||||||||||||||||||||||||||
| These are the “container shapes” that hold the battery: prismatic cells, which are rigid like a can; pouch cells, which are thin like a plastic pack; and cylindrical cells, which are round like AA batteries. Prismatic cells are sturdy, safe, and easy to stack, which is why European automakers favor them. Pouch cells are thin and light, giving them high space efficiency. Cylindrical cells are well suited to standardization and mass production. Even with the same cathode and anode materials, heat dissipation, durability, and cost vary depending on the form factor, so the choice depends on the application. One of Korea’s strengths is that its big three can make all three formats at world-class levels, and that cell manufacturing capability translates directly into competitiveness in winning automaker orders. Recently, the format race has been shifting toward prismatic and 46-series cylindrical cells. | ||||||||||||||||||||||||||||||||||
| 46-series cylindrical cell | 7 | 8 | Strong · Gap 1 | LG Energy Solution, Samsung SDI | ||||||||||||||||||||||||||||||
| This is a large cylindrical battery with a 46mm diameter, named by height—such as 4680 (46×80mm). The format started from a specification proposed by Tesla. Compared with smaller legacy cylindrical cells like the 2170, enlarging the cell allows more energy in the same volume while reducing cell count, parts, and welding points, which lowers cost. It also adopts a tabless structure, eliminating separate thin tabs at the terminals and widening the current path, which improves heat dissipation and fast-charging performance. The catch is that as the cell gets larger, internal temperature becomes less uniform and manufacturing yield becomes harder to stabilize. That makes the race all about who can achieve reliable mass production first. LG Energy Solution is leading 46-series mass production, with Samsung SDI joining the competition for automaker orders. | ||||||||||||||||||||||||||||||||||
| BMS (battery management system) | 7 | 8 | Strong · Gap 1 | LG Energy Solution, Hyundai Mobis, Samsung SDI | ||||||||||||||||||||||||||||||
| This is the battery’s “brain”: the electronics and software that monitor the voltage, current, temperature, and state of charge (SOC) of hundreds of cells in real time to prevent overcharging, overdischarging, and overheating. It also balances differences in charge level from cell to cell, extending the life of the entire pack. Its core role is to detect abnormal signals early—even from a single cell—and isolate the problem before it escalates into a fire. More recently, BMS has been evolving into “BMS as a Service,” sending driving data to the cloud to diagnose and predict battery state of health (SOH) and remotely warn of abnormal signs. After repeated EV and ESS fires, the BMS’s diagnostic and preventive functions have emerged as a central pillar of safety. | ||||||||||||||||||||||||||||||||||
| Cell-to-pack (CTP/CTC) | 6 | 8 | Catching up · Gap 2 | LG Energy Solution, SK On | ||||||||||||||||||||||||||||||
Normally, batteries use a three-stage structure: multiple cells are grouped into a module, and modules are then assembled into a pack. Cell-to-pack (CTP) removes the intermediate module stage and places cells directly into the pack. Cell-to-chassis (CTC) goes one step further by integrating cells directly into the vehicle floor. Eliminating module cases, parts, and empty space allows more battery to fit into the same pack size, significantly improving volumetric efficiency while reducing weight and cost. The tradeoff is that the safety and serviceability benefits once provided by modules must now be replaced through BMS and structural design. China’s CATL and BYD are ahead in CTP combined with LFP,Technology Roadmap
Every time the face at the top changed, the rules of the market changed with itThe shifts in who ranked No. 1 in each era are not just a timeline. They are a record of which technologies and business models actually worked. From the 1990s to 2008, the global leaders were Sanyo and Sony, while LG Chem and Samsung SDI stood out in Korea. From 2009 to 2016, Panasonic led globally, with LG Chem and Samsung SDI at the center domestically.
By 2017~2019, CATL and Panasonic were out front globally, while LG Chem, Samsung SDI, and SK Innovation moved together in Korea. Then in 2020~2024 and 2025~Present, the picture becomes even simpler. Globally, it is CATL and BYD. In Korea, it is LG Energy Solution, Samsung SDI, and SK On. The heart of this shift is that the rules moved from Japan’s edge in precision manufacturing to China’s edge in scale, cost, and packaging. Korea was not vaguely pushed aside here. Its position is clear. The top domestic tier is still held by LG Energy Solution, Samsung SDI, and SK On. But the faces at the very top globally are CATL and BYD. Why? Korea was strong at the high end, and it still has that strength. But as the market expanded, the game shifted toward one where LFP, CTP/CTC, and control over raw materials matter more and more. Korea’s current position is the strongest player in the second tier, carrying both leadership strengths and the burden of chasing the front-runners. Pride alone will not be enough, and if it cannot shore up the weaker parts of its foundation, things will only get more uncomfortable. What matters now isn’t flashy new technology, but how quickly the weak links get fixedThe key things to watch going forward are not splashy announcements about breakthrough technologies. They are how realistically Korea can catch up in LFP, how much it can narrow the gaps in precursor production, nickel refining, and natural and synthetic graphite, and whether it can close the distance in CTP/CTC and dry-electrode processes. High-nickel NCM/NCA, single-crystal cathode materials, silicon anodes, lithium-metal anodes, and electrolytes and additives are clearly Korea’s strengths. But having great weapons alone does not win a war. If the ammunition and supply lines run thin, it becomes very hard to hold out. The real point to watch is whether Korean companies can defend their strength in premium segments while also shoring up their weaker mass-market system. This is not just about cell makers like LG Energy Solution, Samsung SDI, and SK On. You also have to watch Ecopro BM, L&F, POSCO Future M, LG Chem, Daejoo Electronic Materials, Hansol Chemical, SK Materials Group14, Enchem, Dongwha Electrolyte, and Soulbrain. On the flip side, the risks are also clear. If these weak technologies remain weak, Korea may continue to be a country that makes things well, but it will struggle to become the one that captures the biggest share of the value. That difference is bigger than it looks. ※ This article is an analysis compiled from public data and industry materials, and some figures and assessments are estimates. It should not be used as a direct basis for investment decisions. Written: June 2026. E-Alexandro | ||||||||||||||||||||||||||||||||||
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