> ## Content Index > Fetch the complete content index at: https://www.edgewisely.com/llms.txt > Use this file to discover other available public pages before exploring further. # Top 7 Solid-State Battery Companies in 2026 - URL: https://www.edgewisely.com/top-7-solid-state-battery-companies-2026/ - Published: 2026-09-24T04:51:42.000Z - Updated: 2026-09-24T04:52:08.000Z - Description: ProLogium, QuantumScape, Factorial, Samsung SDI, Toyota, Solid Power and CATL ranked by verifiable progress toward production, with real limitations for each. Verified September 2026. - Author: John Karpentar - Tags: Roundups, Deep Tech # Top 7 Solid-State Battery Companies in 2026 **For engineers, investors and industry watchers tracking who is actually building solid-state batteries rather than announcing them. 2026 was the year the field split: a handful of companies now have cells in vehicles and production lines running, while others revised their timelines outward. Claims verified September 2026.** Solid-state batteries replace the flammable liquid electrolyte in a lithium-ion cell with a solid one — ceramic, sulfide or polymer — which allows a lithium-metal anode and, in principle, more energy in less space. The seven companies furthest along in 2026 are ProLogium, QuantumScape, Factorial Energy, Samsung SDI, Toyota, Solid Power and CATL. None of them is selling a mass-market solid-state EV today. The gap between them is how close they are, and how specific they are willing to be about when. ## How we picked these Three criteria, weighted in this order: - **Demonstrated hardware, not slides.** Cells in a real vehicle, a running production line, or verified shipments count. Roadmap announcements alone do not. - **Public, checkable claims.** Everything below traces to company press releases, investor materials, SEC filings or partner announcements. Where a company has not disclosed a figure, this piece says so. - **Distinct position in the supply chain.** The list deliberately mixes cell developers, an electrolyte supplier, and incumbent automotive and cell manufacturers, because those are three different bets on how this technology reaches production. Ranking runs from closest-to-production to furthest. We used the same evidence-first approach for [fusion energy companies](https://www.edgewisely.com/top-7-fusion-energy-companies-2026/) and [space launch companies](https://www.edgewisely.com/top-7-space-launch-companies-2026/). That ordering reflects publicly verifiable progress as of September 2026 — not energy density, not valuation, and not likelihood of eventual success. The largest company on this list sits last for exactly that reason. ## Quick comparison | Company | Best for | Electrolyte approach | Status | | ---------------- | -------------------------------- | ----------------------------- | ---------------------------------- | | ProLogium | Watching first commercial volume | All-ceramic / oxide | GWh-scale plant operating | | QuantumScape | Watching lithium-metal scale-up | Ceramic separator, anode-free | Pilot line ramping | | Factorial Energy | Watching OEM road testing | Quasi-solid and all-solid | Cells in OEM test vehicles | | Samsung SDI | Watching a cell giant commit | Sulfide, silver-carbon anode | Pilot line, 2027 target | | Toyota | Watching the incumbent timeline | Sulfide | Materials plant under construction | | Solid Power | Watching the materials layer | Sulfide electrolyte supply | Scaling electrolyte output | | CATL | A reality check on timelines | Multiple, undisclosed lead | Early-stage, self-declared | ## 1\. ProLogium [ProLogium](https://prologium.com/?ref=edgewisely.com) is a Taiwanese cell maker and the only company on this list with a gigawatt-hour-scale solid-state plant already running. Its Taoke Gigafactory in Taoyuan, Taiwan opened in January 2024 and the company describes it as the first commercial next-generation lithium ceramic battery gigafactory with a publicly demonstrated mass-production line. Its architecture is oxide-ceramic rather than sulfide — a different chemistry bet from most of the field. Progress since has been concrete. ProLogium says shipments of its next-generation lithium ceramic battery have passed **2.4 million units**, and it has announced mass production of a high-energy all-solid-state cell it rates at **381 Wh/kg and 903 Wh/L**. In February 2026 it broke ground on a Dunkirk, France gigafactory for fourth-generation cells, with first-phase operations targeted for **2028 at roughly 0.8 GWh** and total investment stated at **around $8bn over a decade**. **Best for:** watching whether solid-state can reach commercial volume before the end of the decade. **Pros** - Operating GWh-scale production line, which no other company on this list can claim. - Published cell-level energy figures (381 Wh/kg, 903 Wh/L) rather than range-only claims. - Oxide-ceramic route avoids the moisture-sensitivity handling problems of sulfide electrolytes. - European manufacturing under construction, which matters for EU battery sourcing rules. **Cons** - Earlier-generation lithium ceramic products are not fully solid-state, so "solid-state" covers a range of products in its lineup — read the generation number before comparing specs. - Privately held, so there is no quarterly financial disclosure to check the scale-up against. - The Dunkirk plant's 0.8 GWh first phase is small next to conventional gigafactories measured in tens of GWh. - No named mass-market automotive customer has been publicly confirmed for the French output. ![ProLogium Logithium rotary web printing machine on the production line at the Taoke Gigafactory cleanroom in Taoyuan, Taiwan](https://storage.ghost.io/c/54/5a/545a66b3-60ef-480c-80ae-765bac52f6ec/content/images/2026/09/ssb-pro.png) Image: [ProLogium](https://prologium.com/prologium-opens-the-worlds-first-giga-level-solid-state-lithium-ceramic-battery-factory/?ref=edgewisely.com) ## 2\. QuantumScape [QuantumScape](https://www.quantumscape.com/?ref=edgewisely.com) (NYSE: QS) is developing an anode-free lithium-metal cell built around a proprietary ceramic separator. Its flagship is the **QSE-5**, a roughly 5 Ah B-sample cell. Because there is no host anode material, lithium plates directly onto the current collector during charge — which is where the energy-density gain comes from and also where the engineering difficulty lives. The company's 2026 story is manufacturing, not chemistry. Its **Cobra** separator process entered baseline cell production, which QuantumScape says delivers roughly a **25x improvement in heat-treatment speed** over the prior Raptor process in a fraction of the footprint. It inaugurated its automated Eagle Line pilot facility in San Jose in February 2026 and reported **$11.0M in Q1 customer billings**. A QSE-5-powered Ducati V21L race motorcycle was shown at IAA Mobility in Munich. Its commercial path runs largely through a licensing agreement with Volkswagen's PowerCo rather than through building its own gigafactories. **Best for:** watching whether lithium-metal separators can be manufactured at speed and yield. **Pros** - Publicly traded with quarterly disclosure, so milestones and cash burn are both checkable. - Cobra process addresses throughput, which is the specific bottleneck separator production has faced. - PowerCo licensing shifts capital intensity of mass production onto a partner with gigafactory experience. - Delivered a working vehicle demonstration rather than only bench cells. **Cons** - Revenue remains customer billings in the low tens of millions, against a long history of operating losses. - Field testing in vehicles was still the 2026 target — the product is pre-commercial. - The licensing model means QuantumScape's revenue depends on a partner's production decisions. - Anode-free lithium-metal cycle life at automotive scale has not been publicly demonstrated over vehicle-lifetime durations. ![QuantumScape QSE-5 B-sample lithium-metal solid-state battery cell](https://storage.ghost.io/c/54/5a/545a66b3-60ef-480c-80ae-765bac52f6ec/content/images/2026/09/ssb-qs.png) Image: [QuantumScape](https://www.quantumscape.com/technology/?ref=edgewisely.com) ## 3\. Factorial Energy [Factorial](https://factorialenergy.com/?ref=edgewisely.com) (Nasdaq: FAC) develops both a quasi-solid-state platform it calls FEST and an all-solid-state line, and it has gone further than most on getting cells into real cars. In 2025 a modified Mercedes-Benz EQS running Factorial cells completed a **1,205 km (748-mile)** public-road drive from Stuttgart to Malmö on a single charge. In June 2026 Stellantis integrated **77 Ah FEST cells** into a Dodge Charger Daytona development vehicle and began a road-testing programme — Stellantis described it as the first integration of solid-state cells into one of its vehicles. The company completed a SPAC merger with Cartesian Growth Corporation III and began trading on Nasdaq on **8 June 2026** at roughly **$1.3bn equity value**, raising over **$100m gross**. It has said the proceeds support commercialisation across defence, aerospace, [data centres](https://www.edgewisely.com/top-7-gpu-cloud-providers-for-ai-training-and-inference-2026/) and electric mobility — a broader target market than EV-only competitors. **Best for:** watching OEM validation, because two major automakers are testing its cells in vehicles. **Pros** - Two named automotive partners, Mercedes-Benz and Stellantis, with cells in physical test vehicles. - The 1,205 km demonstration was run on public highways, not a test track or simulation. - Now publicly listed, so financials and milestone claims are subject to SEC disclosure. - Pursuing defence, aerospace and data-centre markets, which tolerate higher cell costs than automotive. **Cons** - FEST is quasi-solid-state, retaining some liquid content — it is not directly comparable to all-solid-state cells on safety claims. - SPAC listings historically carry weak post-merger share performance and dilution risk from warrants. - Just over $100m gross is modest capital against the cost of building cell manufacturing. - Road testing is a development-fleet stage; no production vehicle programme has a confirmed start date. ![Factorial FEST quasi-solid-state battery cell product visual](https://storage.ghost.io/c/54/5a/545a66b3-60ef-480c-80ae-765bac52f6ec/content/images/2026/09/ssb-fac.png) Image: [Factorial](https://factorialenergy.com/technology/?ref=edgewisely.com) ## 4\. Samsung SDI [Samsung SDI](https://www.samsungsdi.com/?ref=edgewisely.com) is pursuing sulfide-based all-solid-state cells with a silver-carbon composite anode, and it has been unusually specific about timing: mass production at its Ulsan plant in **the second half of 2027**. Its **S-Line** pilot facility, a roughly 6,500 m² line at the Suwon R&D campus, was completed in 2023 and has run multiple rounds of formulation and process validation since. The company has publicly targeted energy density **above 900 Wh/L**, and reporting on customer feedback has emphasised safety as the early selling point rather than range. Samsung SDI matters here because it is an established large-format cell manufacturer — it already knows how to run automotive-qualified production lines, which is the step most startups on this list have not attempted. **Best for:** watching whether an incumbent cell maker hits a stated production date. **Pros** - Existing automotive cell manufacturing capability, quality systems and OEM relationships. - A named plant and a named half-year for mass production, which is more specific than most peers. - Dedicated pilot line running since 2023 rather than a line still being installed. - Also supplies the conventional battery business, so solid-state is not an all-or-nothing bet. **Cons** - Silver-carbon anodes raise material-cost questions that the company has not addressed publicly with figures. - Sulfide electrolytes are moisture-sensitive and generate hydrogen sulfide on exposure to water, adding manufacturing-environment cost. - Initial output is aimed at super-premium vehicles, so near-term volumes will be small. - Solid-state disclosure is limited compared with a pure-play's quarterly milestone reporting. ![Samsung SDI corporate headquarters, where the company runs its S-Line all-solid-state battery pilot production line](https://storage.ghost.io/c/54/5a/545a66b3-60ef-480c-80ae-765bac52f6ec/content/images/2026/09/ssb-sdi.png) Image: [Samsung SDI](https://www.samsungsdi.com/index.html?ref=edgewisely.com) ## 5\. Toyota [Toyota](https://global.toyota/?ref=edgewisely.com) has been promising solid-state batteries longer than anyone and has repeatedly moved the date. Its current public position is the introduction of its first all-solid-state battery EV in **2028**, and as of late 2025 the company said it was holding that schedule. The chemistry is sulfide-based. What changed in 2026 is that the supply chain became physical. Partner **Idemitsu Kosan** began construction of a large-scale pilot plant for solid electrolytes, with completion expected by **end of 2027** and annual capacity described as several hundred tonnes. Idemitsu has said it aims to begin mass-producing solid electrolyte material in 2027\. Toyota also announced a collaboration with Sumitomo Metal Mining in October 2025 on mass production of cathode materials. Those are the unglamorous steps that decide whether 2028 is real. **Best for:** watching the materials supply chain, which is the constraint nobody can skip. **Pros** - Deep in-house battery research and the manufacturing scale to absorb a slow ramp. - Electrolyte and cathode supply partners are named and building plants, not just signing MOUs. - Can subsidise early solid-state volumes against a large profitable conventional vehicle business. - Public commitment to a specific launch year rather than an open-ended horizon. **Cons** - Long history of moved solid-state timelines, which makes the 2028 date worth discounting. - The electrolyte pilot plant is not due to complete until the end of 2027, leaving little margin before a 2028 launch. - "Several hundred tonnes" of electrolyte per year supports limited cell volume — this is a low-volume launch, not a fleet transition. - Toyota does not publish cell-level performance figures for its solid-state programme. ![Toyota diagram of an all-solid-state battery cell showing lithium ions moving between cathode and anode through a solid electrolyte](https://storage.ghost.io/c/54/5a/545a66b3-60ef-480c-80ae-765bac52f6ec/content/images/2026/09/ssb-toy.png) Image: [Toyota](https://global.toyota/en/newsroom/corporate/39865919.html?ref=edgewisely.com) ## 6\. Solid Power [Solid Power](https://www.solidpowerbattery.com/?ref=edgewisely.com) (Nasdaq: SLDP) made the most interesting strategic choice on this list: it largely stopped trying to be a cell manufacturer and repositioned as a **sulfide electrolyte supplier**. It sells electrolyte material to partners who build the cells — Samsung SDI integrates it into separator or catholyte for cells that BMW then evaluates. Its partner list is BMW, SK On and Samsung SDI. BMW has previously put Solid Power-derived all-solid-state cells into a test i7. The commercial question is throughput. The company has been scaling from roughly **30 tonnes of annual pilot electrolyte capacity toward 75 tonnes by the end of 2026**, via a continuous line designed to add 45 tonnes, with equipment acceptance targeted for Q3 2026 and plant validation and startup planned for Q4 2026\. Those are small numbers in absolute terms, which is the honest read on where the sulfide supply chain is. **Best for:** watching the materials layer, where several cell programmes converge on the same input. **Pros** - Supplier model means multiple customer programmes can succeed without Solid Power winning a cell contract. - Three named partners — BMW, SK On and Samsung SDI — across two continents. - Publicly traded, with capacity milestones stated by quarter in investor materials. - Sulfide electrolytes offer among the highest ionic conductivity of the solid electrolyte classes. **Cons** - 75 tonnes a year is pilot-scale; automotive volume would require orders of magnitude more. - Revenue depends on partners' programme decisions, over which Solid Power has no control. - Capacity targets are conditional on commissioning and validation succeeding on schedule. - As a materials supplier it captures a smaller share of eventual battery value than a cell maker would. ## 7\. CATL [CATL](https://www.catl.com/?ref=edgewisely.com) is the world's largest battery manufacturer, which makes its position on solid-state the most useful data point in this article. The company has said its solid-state technology sits at about **four on a nine-level technology readiness scale**, and has acknowledged that mass production and widespread adoption are unrealistic before **2030**. That is a notably more conservative statement than most of this list, and it comes from the company with the most manufacturing experience. CATL's commercial energy is currently going into conventional chemistry instead — its ShenXing fast-charging platform uses a liquid electrolyte. The company is included here not because it is ahead, but because when the dominant cell maker publicly rates its own solid-state programme at TRL 4, that is the most credible available check on everyone else's timeline. **Best for:** calibrating expectations against the largest manufacturer's own assessment. **Pros** - Unmatched manufacturing scale and supply chain if and when it decides to commit. - Publicly stated a specific readiness level, which is rarer and more useful than a launch year. - Parallel work across multiple chemistry routes rather than one architectural bet. - Profitable conventional business funds research without milestone pressure. **Cons** - Self-declared TRL 4 of 9 means laboratory validation, not production readiness. - No solid-state product launch date, and the company has said pre-2030 adoption is unrealistic. - Has not published cell-level solid-state performance data comparable to ProLogium's or Samsung SDI's targets. - Geopolitical export and tariff exposure complicates its route into North American and European programmes. ![CATL ShenXing superfast charging battery pack, the company's current liquid-electrolyte flagship product](https://storage.ghost.io/c/54/5a/545a66b3-60ef-480c-80ae-765bac52f6ec/content/images/2026/09/ssb-catl.png) Image: [CATL](https://www.catl.com/en/brand/technologybrand/?ref=edgewisely.com) ## How to choose **If you want evidence of commercial volume.** ProLogium is the only company here with a GWh-scale line running and unit shipments in the millions. Check which product generation any spec refers to. **If you are tracking lithium-metal specifically.** QuantumScape. Its Cobra throughput numbers and Eagle Line ramp are the clearest public window into whether separator manufacturing scales. **If OEM validation is your signal.** Factorial. Cells in a Mercedes EQS and a Dodge Charger Daytona is the strongest evidence of automaker confidence on this list. **If you trust incumbents over startups.** Samsung SDI for a stated 2027 production date, Toyota for 2028\. Both are worth discounting, but both have manufacturing they can actually use. **If you think the bottleneck is materials.** Solid Power. Sulfide electrolyte supply constrains several programmes simultaneously, and 75 tonnes a year shows how early that supply chain is. **If you want a sanity check.** CATL. When the largest battery maker in the world rates its own programme at TRL 4 and says not before 2030, treat every 2027 promise accordingly. ## Frequently Asked Questions ### What is a solid-state battery? A solid-state battery replaces the liquid electrolyte in a conventional lithium-ion cell with a solid material — typically a ceramic, sulfide or polymer. The solid electrolyte is non-flammable and can enable a lithium-metal anode, which stores more energy in the same volume than the graphite anode used today. ### When will solid-state batteries be in cars? Small demonstration and development fleets already exist: Factorial cells have run in a Mercedes EQS and a Dodge Charger Daytona test vehicle. For production vehicles, Samsung SDI targets mass production in the second half of 2027 and Toyota targets a first all-solid-state EV in 2028\. Both dates have moved before. Battery timing also shapes adjacent sectors — see our roundups of [eVTOL companies](https://www.edgewisely.com/top-7-evtol-companies-2026/) and [robotaxi companies](https://www.edgewisely.com/top-7-robotaxi-companies-2026/). ### Are solid-state batteries safer than lithium-ion? The solid electrolyte removes the flammable liquid that drives thermal-runaway fires in conventional cells, which is the main safety argument. But safety depends on the full cell design, not the electrolyte alone, and independent automotive-scale abuse testing of production solid-state cells is not yet publicly available. ### Do solid-state batteries use lithium? Yes. Solid-state batteries are still lithium batteries — the change is the electrolyte, not the working ion. Many designs go further and use a lithium-metal anode instead of graphite, which increases lithium content per cell rather than reducing it. ### Which companies are closest to producing solid-state batteries? ProLogium operates a GWh-scale plant in Taiwan today. Samsung SDI has stated mass production for the second half of 2027 and Toyota for 2028\. QuantumScape and Factorial have cells in vehicle demonstrations. CATL, the largest battery maker, says widespread adoption before 2030 is unrealistic. --- **Editor's note — sources:** [ProLogium Dunkirk groundbreaking](https://prologium.com/prologium-breaks-ground-on-dunkirk-gigafactory-in-france/?ref=edgewisely.com) and [Taoke Gigafactory opening](https://prologium.com/prologium-opens-the-worlds-first-giga-level-solid-state-lithium-ceramic-battery-factory/?ref=edgewisely.com); [QuantumScape Cobra baseline production announcement](https://www.quantumscape.com/quantumscape-achieves-major-milestone-cobra-separator-process-enters-baseline-production?ref=edgewisely.com) and [Q4 FY2025 shareholder letter](https://ir.quantumscape.com/static-files/298db199-d53c-4b90-bf9e-e1fd2a5df11a?ref=edgewisely.com); [Stellantis and Factorial milestone release](https://www.stellantis.com/en/news/press-releases/2025/april/stellantis-and-factorial-energy-reach-key-milestone-in-solid-state-battery-development?ref=edgewisely.com) and [Factorial Energy investor relations](https://ir.factorialenergy.com/ir-resources/investor-faqs?ref=edgewisely.com); [Idemitsu and Toyota cooperation announcement](https://global.toyota/en/newsroom/corporate/39865919.html?ref=edgewisely.com); [BMW Group all-solid-state test release](https://www.press.bmwgroup.com/global/article/detail/T0450240EN/bmw-group-and-solid-power-are-testing-all-solid-state-battery-cells-in-a-bmw-i7?language=en&ref=edgewisely.com) and [Solid Power partnership announcement](https://www.solidpowerbattery.com/investor-relations/investor-news/news-details/2025/Solid-Power-Partners-with-Samsung-SDI-and-BMW-to-Advance-All-Solid-State-Battery-Technology/default.aspx?ref=edgewisely.com). Figures and timelines verified September 2026 and subject to change. Rankings and "best for" framing are Edgewisely's analysis.