Key takeaways
- Top pick: QuantumScape, best for: Automakers planning solid-state EV programmes. QuantumScape and PowerCo showed a Ducati motorcycle running on QuantumScape solid-state cells at IAA Mobility.
- Also near the top: Toyota, best for: Drivers waiting for solid-state Toyota and Lexus models; and Samsung SDI, best for: Premium EV makers seeking a large-scale cell supplier.
- How it was ranked: 10 deep tech companies compared. Each verdict is below.
Best Solid-State Battery Companies: Top 10 Ranked. QuantumScape ranks first, with a Lister Score of 97.0.
QuantumScape leads among specialist developers, with B-sample cells and a licensing deal with Volkswagen's PowerCo.
Toyota and
Samsung SDI are the large manufacturers closest to volume production, while
Factorial Energy is the most proven in road testing, with a Mercedes-Benz EQS that drove 1,205 km on one charge.
Best Solid-State Battery Companies in 2026, compared| RANK | ENTRY | BEST FOR | SCORE | FROM |
|---|
| 1 |  QuantumScapeQuantumScape and PowerCo showed a Ducati motorcycle running on QuantumScape solid-state cells at IAA Mobility. | Automakers planning solid-state EV programmes | 97.0 | Custom |
|---|
|
| 2 |  ToyotaIdemitsu announced a pilot solid-electrolyte plant for Toyota's EV batteries in January 2026. | Drivers waiting for solid-state Toyota and Lexus models | 95.9 | Not public |
|---|
|
| 3 |  Samsung SDISamsung SDI showed its SolidStack all-solid-state battery at InterBattery 2026. | Premium EV makers seeking a large-scale cell supplier | 94.6 | Custom |
|---|
|
| 4 |  Factorial EnergyA Mercedes-Benz EQS fitted with Factorial cells drove 1,205 km from Stuttgart to Malmo on one charge in September 2025. | Automakers wanting cells already proven in road tests | 93.3 | Custom |
|---|
|
| 5 |  Solid PowerBMW Group is testing Solid Power's all-solid-state cells in a BMW i7 test vehicle. | Cell makers that need sulfide solid electrolyte | 92.0 | Custom |
|---|
|
| 6 |  ProLogiumProLogium says its Gen 3.5 all-solid-state battery reaches 381 Wh/kg and 903 Wh/L. | EV makers seeking high energy density cells | 90.6 | Custom |
|---|
|
| 7 |  CATLCATL said in June 2026 that it does not expect solid-state mass production before 2030. | Integrators and developers sourcing storage cells and systems at scale | 89.2 | Custom |
|---|
|
| 8 |  Blue SolutionsBlue Solutions' lithium metal polymer batteries have been used in Bollore's Bluebus electric buses. | Vehicle makers interested in polymer solid-state cells | 87.8 | Custom |
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|
| 9 |  IlikaIlika has shipped 10 Ah Goliath solid-state battery prototypes. | Medical device makers needing tiny solid-state batteries | 86.3 | Custom |
|---|
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| 10 |  Ion Storage SystemsIon Storage Systems says it closed a $30 million Series A funding round. | Defence and industrial buyers wanting US-made cells | 85.0 | Custom |
|---|
|
|
How to choose
Start from what you need it for. Where each entry fits best:
- QuantumScape (#1): Automakers planning solid-state EV programmes
- Toyota (#2): Drivers waiting for solid-state Toyota and Lexus models
- Samsung SDI (#3): Premium EV makers seeking a large-scale cell supplier
- Factorial Energy (#4): Automakers wanting cells already proven in road tests
- Solid Power (#5): Cell makers that need sulfide solid electrolyte
- ProLogium (#6): EV makers seeking high energy density cells
- CATL (#7): Integrators and developers sourcing storage cells and systems at scale
- Blue Solutions (#8): Vehicle makers interested in polymer solid-state cells
- Ilika (#9): Medical device makers needing tiny solid-state batteries
- Ion Storage Systems (#10): Defence and industrial buyers wanting US-made cells
Each entry's full verdict is below.
The ranking, in detail
01
Lithium-metal solid-state cells for electric vehicles
QuantumScape, founded in 2010 in San Jose, California, develops lithium-metal solid-state cells with a ceramic separator. It is listed on Nasdaq, licensed its QSE-5 platform to Volkswagen's PowerCo in July 2024 and shipped its first QSE-5 B-sample cells in October 2024.
PROS- Licensing deal with Volkswagen's PowerCo
- B-sample cells already shipped
CONS- Not yet in volume production
- Price not published
- Best for
- Automakers planning solid-state EV programmes
- Where it falls short
- It is not yet in volume production.
- Pick something else if
- you need immediate availability.
97.0
02
Automaker solid-state programme with Idemitsu
Toyota is developing sulfide all-solid-state batteries for its electric vehicles, with Idemitsu Kosan supplying the solid electrolyte. In January 2026 Idemitsu said it would build a pilot solid-electrolyte plant for Toyota, with production targeted for 2027 to 2028.
PROS- Large patent portfolio in solid-state cells
- Secured electrolyte supply through Idemitsu
CONS- Batteries are for Toyota's own vehicles
- No cars on sale with them yet
- Best for
- Drivers waiting for solid-state Toyota and Lexus models
- Where it falls short
- No cars with solid-state batteries are on sale yet.
- Pick something else if
- you need a car with solid-state batteries today.
95.9
03
SolidStack all-solid-state battery
Samsung SDI, the South Korean battery maker, is developing sulfide all-solid-state cells under the SolidStack name. It showed SolidStack at InterBattery 2026 and is targeting mass production by 2027.
PROS- Existing high-volume battery manufacturing
- Partnership with BMW and Solid Power
CONS- Pre-commercial stage
- Price not published
- Best for
- Premium EV makers seeking a large-scale cell supplier
- Where it falls short
- It is not yet commercially available and pricing is undisclosed.
- Pick something else if
- you need a ready-to-ship battery with known costs.
94.6
04
Solid-state cells tested by Mercedes-Benz and Stellantis
Factorial Energy, founded in 2018, develops lithium-metal solid-state cells for vehicles, aerospace and data centres. It began trading on Nasdaq under the ticker FAC on 8 June 2026 after a SPAC merger valuing it at about $1.3 billion.
PROS- Real-world road testing with Mercedes-Benz
- Several automaker partners
CONS- Not yet in volume production
- Price not published
- Best for
- Automakers wanting cells already proven in road tests
- Where it falls short
- It is not yet in volume production.
- Pick something else if
- you need immediate availability.
93.3
05
Sulfide solid electrolyte and cell designs
Solid Power, based in Louisville, Colorado, and listed on Nasdaq, makes sulfide solid electrolyte and solid-state cell designs. Its cells are being tested by BMW in an i7 test vehicle, and it supplies electrolyte to Samsung SDI under a three-way partnership with BMW.
PROS- Sells electrolyte, not only cells
- Partners include BMW and Samsung SDI
CONS- Small revenue so far
- Relies on partners for cell production
- Best for
- Cell makers that need sulfide solid electrolyte
- Where it falls short
- It relies on partners for cell production.
- Pick something else if
- you need independent manufacturing control.
92.0
06
Lithium-ceramic solid-state batteries
ProLogium, founded in Taiwan, makes lithium-ceramic batteries and has announced a gigafactory in Dunkirk, France. It says it has begun mass production of its Gen 3.5 all-solid-state battery, rated at 381 Wh/kg and 903 Wh/L.
PROS- High stated energy density
- Production in Taiwan with a European plant planned
CONS- Few named automaker customers
- Price not published
- Best for
- EV makers seeking high energy density cells
- Where it falls short
- It does not disclose its pricing, making cost comparison difficult.
- Pick something else if
- you need transparent upfront pricing.
90.6
07
Energy storage cells and TENER systems
CATL, based in Ningde, China, is the largest maker of EV batteries and is developing all-solid-state cells. In June 2026 it described its solid-state work as level 4 on a 9-level scale and said mass production was not expected before 2030.
PROS- Largest energy storage battery volume
- Also offers sodium-ion storage
CONS- Much of its volume sold through integrators
- Faces political restrictions in the US
- Best for
- Integrators and developers sourcing storage cells and systems at scale
- Where it falls short
- Political restrictions in the US limit availability for American buyers.
- Pick something else if
- you are based in the United States.
89.2
08
Lithium metal polymer solid-state batteries
Blue Solutions, part of France's Bollore Group, makes lithium metal polymer solid-state batteries that have powered its Bluebus electric buses. In September 2026 Bollore said it was considering ending Bluebus production to refocus on its fourth-generation battery.
PROS- Solid-state cells already used in vehicles
- Backed by a large industrial group
CONS- Business being restructured
- Next-generation cell still in development
- Best for
- Vehicle makers interested in polymer solid-state cells
- Where it falls short
- Its next-generation cell is still in development.
- Pick something else if
- you need a mature next-generation cell.
87.8
09
Solid-state micro-batteries and EV cells
Ilika is a UK company listed in London that develops Stereax solid-state micro-batteries for medical implants and sensors, and Goliath solid-state cells for electric vehicles.
PROS- Two product lines for devices and vehicles
- Micro-battery manufacturing equipment commissioned
CONS- Small company
- Goliath still at prototype stage
- Best for
- Medical device makers needing tiny solid-state batteries
- Where it falls short
- Small company.
- Pick something else if
- you need a large-scale manufacturer.
86.3
10
Ceramic solid-state batteries made in the US
Ion Storage Systems, based in College Park, Maryland, develops ceramic-electrolyte solid-state batteries and has announced a new headquarters manufacturing facility.
PROS- US-based manufacturing
- Ceramic electrolyte with no liquid
CONS- Early commercial stage
- Price not published
- Best for
- Defence and industrial buyers wanting US-made cells
- Where it falls short
- Early commercial stage.
- Pick something else if
- you need a proven product with transparent pricing.
85.0
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Frequently asked questions
What are the best Solid-State Battery Companies?
QuantumScape ranks first on Lister. QuantumScape, founded in 2010 in San Jose, California, develops lithium-metal solid-state cells with a ceramic separator. It is listed on Nasdaq, licensed its QSE-5 platform to Volkswagen's PowerCo in July 2024 and shipped its first QSE-5 B-sample cells in October 2024.
What are the top 10 Solid-State Battery Companies?
1. QuantumScape; 2. Toyota; 3. Samsung SDI; 4. Factorial Energy; 5. Solid Power; 6. ProLogium; 7. CATL; 8. Blue Solutions; 9. Ilika; 10. Ion Storage Systems.
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