Samsung Solid State Batteries: What We Know

Samsung solid state batteries are an emerging battery technology that replaces the liquid electrolyte in conventional lithium-ion cells with a solid material, promising higher energy density, faster charging, and improved safety. As of 2025, Samsung SDI has publicly demonstrated prototype cells and announced pilot production lines, but commercial availability in consumer devices is still a few years away. This article explains what makes these batteries different, what Samsung has announced, and what you can realistically expect.

Background: Why Solid State?

Conventional lithium-ion batteries use a liquid electrolyte to carry ions between the anode and cathode. This liquid is flammable, limits how fast you can charge without damaging the cell, and degrades over time. Solid state batteries replace that liquid with a solid ceramic, polymer, or sulfide-based electrolyte. That single change brings three major benefits:

• Higher energy density: Solid electrolytes allow the use of a pure lithium metal anode, which stores far more energy per gram than the graphite anode used today. Samsung’s lab prototypes have achieved energy densities over 900 Wh/L, compared to roughly 700 Wh/L for the best current lithium-ion cells.
• Faster charging: Solid electrolytes can conduct lithium ions quickly without the risk of dendrite growth (tiny lithium spikes that can short-circuit a liquid cell). Samsung’s pilot cells have charged to 80% in about 10 minutes in lab tests.
• Improved safety: No flammable liquid means a punctured or damaged cell is far less likely to catch fire. This is a key selling point for electric vehicles and aerospace applications.

Samsung SDI has been working on solid state batteries for over a decade, with a dedicated R&D team and a pilot line in Suwon, South Korea. In 2023, they announced a target of producing solid state cells for premium electric vehicles by 2027, and for consumer electronics (smartphones, laptops) later in the decade.

How Samsung’s Solid State Battery Works

Samsung’s approach uses a sulfide-based solid electrolyte, which has the highest ionic conductivity of any solid material discovered so far. The anode is a thin layer of lithium metal, and the cathode is a conventional nickel-rich NMC (nickel-manganese-cobalt) compound. The cell is assembled in a dry room to prevent moisture from degrading the sulfide electrolyte.

The key innovation Samsung has highlighted is a silver-carbon composite layer that sits between the lithium anode and the solid electrolyte. This layer prevents the formation of lithium dendrites during charging and extends the cycle life. In their published research (Nature Energy, 2020), a prototype cell with this layer retained 99.8% of its capacity after 1,000 cycles.

Because the electrolyte is solid, the cell can be stacked in a bipolar configuration—positive and negative electrodes on opposite sides of a single sheet—which reduces the weight of current collectors and increases the voltage of the pack. This is particularly attractive for EVs, where space and weight are critical.

What Samsung Has Announced (and What’s Still Rumour)

Here’s a timeline of Samsung’s public announcements, based on press releases and official statements:

• 2020: Samsung Advanced Institute of Technology (SAIT) published a paper in Nature Energy describing a prototype cell with 900 Wh/L energy density and the silver-carbon layer.
• 2023: Samsung SDI announced the construction of a pilot production line for solid state batteries in Suwon, with an initial capacity of 1 GWh per year. They stated that mass production for EVs would start in 2027.
• 2024: At the InterBattery trade show, Samsung SDI displayed a solid state battery prototype that they claimed could be charged to 80% in 9 minutes and had a range of 900 km (560 miles) on a single charge.
• 2025: Samsung SDI began supplying sample solid state cells to select EV manufacturers for testing. No consumer product has been announced yet.

It’s important to note that Samsung SDI is a separate company from Samsung Electronics (which makes Galaxy phones). The battery division sells to many automakers, not just Samsung’s own devices. So a “Samsung solid state battery” in a Galaxy phone is not guaranteed—it depends on whether the electronics division chooses to use SDI’s cells.

How to Choose: What to Look For in a Solid State Battery

If you’re considering a device or EV with a solid state battery, here are the key specs to compare:

• Energy density (Wh/L or Wh/kg): Higher is better. Samsung’s target is 1,000 Wh/L by 2027, which would roughly double the range of an EV for the same battery size.
• Cycle life: Look for at least 1,000 full charge-discharge cycles before capacity drops below 80%. Samsung’s prototypes exceed this, but production cells may vary.
• Charging speed: Solid state should allow 10-80% in under 15 minutes, but only if the charging infrastructure can deliver that power.
• Operating temperature: Some solid electrolytes perform poorly in cold weather. Check the rated temperature range.
• Safety certifications: Look for UN 38.3 (transport) and UL 1642 (cell safety) certifications, though these are not yet published for Samsung’s solid state cells.

Common Problems and Misconceptions

Misconception: Solid state batteries are already in phones. No. As of 2025, no consumer device on the market uses a solid state battery. Samsung’s pilot line is for testing, not mass production.

Problem: High manufacturing cost. Solid electrolytes are expensive to produce and require dry-room assembly, which is energy-intensive. Samsung’s current pilot cells cost roughly 3-4 times more per kWh than conventional lithium-ion. This is why early adoption will be in premium EVs, not budget phones.

Problem: Sulfide electrolyte sensitivity to moisture. Sulfides react with water to produce hydrogen sulfide gas, which is toxic. This means cells must be sealed perfectly and handled in dry environments, complicating recycling and repair.

Problem: Mechanical stress. Solid electrolytes are brittle. Repeated expansion and contraction of the lithium anode during charging can cause cracks, leading to capacity loss. Samsung’s silver-carbon layer helps, but it’s not a complete solution.

Comparison: Solid State vs. Current Lithium-Ion

Property	Samsung Solid State (prototype)	Current Li-ion (e.g., NMC)
Energy density (Wh/L)	900-1,000	650-750
Charging time (10-80%)	~9 minutes	20-40 minutes (with fast charger)
Cycle life	1,000+ (lab)	500-1,500 (varies)
Safety	Non-flammable solid	Flammable liquid
Cost per kWh	~$300 (est.)	~$100-150

These numbers are based on published research and industry estimates; actual production figures will differ.

Cost and Availability Timeline

Samsung SDI has not published official prices. Based on industry reports, early solid state cells will cost $300-$500 per kWh, compared to $100-$150 for current lithium-ion. That premium will gradually decline as production scales.

Here’s a realistic timeline:

• 2026-2027: Pilot production for EVs, limited to luxury models.
• 2028-2030: Wider EV adoption, possibly in Samsung Galaxy devices if the electronics division opts in.
• 2030+: Mainstream adoption if costs drop below $100/kWh.

For now, if you’re in the market for a phone or EV, current lithium-ion technology is your only option. Solid state is a future upgrade, not a current choice.

Safety Considerations

Solid state batteries are generally safer than liquid lithium-ion, but they are not risk-free. The sulfide electrolyte can release toxic gas if exposed to moisture. Also, the lithium metal anode can still catch fire if the cell is overcharged or punctured, though the risk is much lower than with liquid electrolytes.

For consumers, this means:

• Follow manufacturer charging instructions.
• Use certified chargers and cables.
• If a device with a solid state battery is damaged, do not attempt to disassemble it—return it to the manufacturer.

Alternatives to Samsung Solid State

Several other companies are developing solid state batteries:

• Toyota: Has a similar timeline, targeting 2027-2028 for EVs.
• QuantumScape: A US startup focusing on EVs, with a different ceramic electrolyte.
• Solid Power: Partnered with BMW and Ford, using a sulfide-based approach similar to Samsung.
• CATL and BYD: Chinese manufacturers are working on semi-solid state batteries, which use a gel-like electrolyte and are already in some EVs (e.g., Nio’s ET7).

Each has trade-offs in cost, performance, and manufacturing readiness.

Frequently Asked Questions

Will Samsung solid state batteries be in the Galaxy S26?

No. The Galaxy S26 (expected 2026) will use conventional lithium-ion batteries. Samsung SDI’s pilot line is for EVs, and consumer electronics are not expected until 2028 at the earliest.

What is the energy density of Samsung’s solid state battery?

Samsung’s published prototype achieved 900 Wh/L, and they aim for 1,000 Wh/L in production. That’s about 30-40% higher than current lithium-ion.

Are solid state batteries safe?

They are safer than liquid lithium-ion in terms of fire risk, but they introduce new hazards like toxic gas release if damaged. Proper sealing and handling are critical.

How much will a solid state battery cost?

Early cells will cost $300-$500 per kWh, dropping to below $200 by 2030 as production scales. For a 100 kWh EV battery, that’s $30,000-$50,000 initially.

Can I buy a solid state battery today?

No. No commercial product uses a true solid state battery as of 2025. Some “semi-solid” batteries exist in Chinese EVs, but they are a hybrid technology.

How long will a solid state battery last?

Samsung’s lab cells retained 99.8% capacity after 1,000 cycles. That’s roughly 300,000-500,000 km in an EV, or 5-10 years in a phone.

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