Solid State Batteries:
Should we wait for a miracle?

"Lithium killer", "Eternal battery", "Holy Grail of energy" - this is what Solid State Battery (SSB) technology is called. Investors and business owners often ask: "Will my BESS system be obsolete in 3 years?". Short answer: no. But let's go into detail why SSB is not a threat to your investment, but a separate technology for other niches.

What is a Solid State Battery?

In classic Li-ion batteries (NMC, LiFePO4, NCA), lithium ions move between the cathode and the anode through liquid organic electrolyte — a mixture of carbonate solvents with a lithium salt. This electrolyte is flammable, and it is the cause of most thermal events (thermal runaway) in batteries.

In SSB, the liquid electrolyte is replaced solid ionic conductor. It can be ceramic (Li₇La₃Zr₂O₁₂ — LLZO), sulfide glass (Li₆PS₅Cl), oxide material, or polymer (PEO). Each type has its advantages and limitations:

• Oxide ceramics (LLZO): Highest stability and security. Challenge & Problem Statement — fragility and complex sintering process at 1000°C+.
• Sulfide glass (Li₆PS₅Cl): The highest ionic conductivity (up to 25 mS/cm, close to liquid electrolyte). Challenge & Problem Statement — reacts with moist air to form H₂S.
• Polymers (PEO): Flexible, easy to manufacture. Challenge & Problem Statement - only work at 60-80°C, low conductivity at room temperature.
• Hybrid (composite): Ceramics of polymer are combined. The most promising direction is the balance between conductivity and manufacturability.

Energy density: SSB vs current generation

Home advantage of SSB is the use of lithium metal anode instead of graphite. This allows you to theoretically double or triple the energy density. But for stationary BESSs, energy density is not a key parameter. More important cost per kWh and number of cycles.

Key Benefits of SSB

Engineering Challenges: Why SSB is still not in series

Despite decades of research and billions of investments, the technology faces fundamental problems that cannot be solved by simple scaling:

1. Lithium dendrites

When a lithium-metal anode is charged, lithium settles unevenly, forming needle-like structures — dendrites. They sprout through the solid electrolyte and cause short circuits. LLZO ceramics restrain them better, but at high charging currents (>1C) the problem returns. Sulfide electrolytes are even more vulnerable.

2. Contact at the phase boundary

Liquid electrolyte naturally fills all the micropores in the electrode. Solid - no. Between the solid electrolyte and the cathode particles are formed clearances, which increase during cycling due to expansion/compression of the material. This leads to an increase in impedance and loss of capacity.

3. Production scaling

Making one cell in the laboratory with a capacity of 1-5 Ah is a task for a graduate student. Make a million cells of 50+ Ag of the same characteristics and rejection

4. Price

Cost of SSB cell — $300-500/kWh (laboratory samples 2025). For comparison, LiFePO4 cells on the open market are $50-70/kWh. Even with optimistic scaling, SSB will not fall below $120-150/kWh until 2030 years. For stationary BESSs, where price is a key factor, this means that SSBs are not competitive.

SSB market players: Who is leading the way

The SSB market is divided between automakers, startups, and Asian giants. Each chose their own approach to electrolyte and scaling.

Technology Readiness Level (TRL)

TRL is a standard scale from 1 (basic research) to 9 (mass production). Where is SSB now?

Why SSB is not for stationary BESS

Let's be honest: all the benefits of SSB are optimized for mobile applications where weight and size are critical. Stationary BESSs have other priorities:

"Solid State for stationary BESS is like using aerospace titanium to build a warehouse. Technically possible, economically absurd." — Dr. George Crabtree, Argonne National Laboratory

Road map: When what to expect

Investment strategy: Wait or act?

Waiting for Solid State is losing money now. Let the numbers speak for themselves:

What's next: Not SSB, but LFP 2.0

The real threat to current LFPs is not Solid State, but the next generation of the LFP itself. Here's what awaits the stationary BESS market:

• LMFP (LiFeMnPO4): Adding manganese increases the cell voltage from 3.2V to 3.8V → +15-20% density for the same price. CATL (M3P), BYD are already testing.
• Na-Ion (sodium ion): $30-45/kWh, 0°C capacity, no lithium in the supply chain. Ideal for 2-4 hour storage. Already TRL 8-9.
• LFP of silicon anode: Adding SiOx to graphite increases the capacity by 30%. Pilot projects 2025-2026.
• Proto-flow BESS: Vanadium, zinc-bromine and iron-air batteries for 8-100 hours of storage. Compete of SSB in a completely different niche.

Frequently Asked Questions

Will SSB make my LiFePO4 system obsolete?

No. SSBs are optimized for mobile applications (EVs, drones, electronics) where weight and charging speed are critical. For stationary BESS, the key parameter is cost per cycle ($/kWh/cycle), and here LFP will remain the leader until at least 2033-2035 years. Your LFP system with 6000+ cycles will work for 15+ years and pay for itself 5-7 times.

When will SSB be mass available for BESS?

The optimistic forecast is 2033-2035 for pilot stationary projects. Mass production of SSB for grid-scale BESS (where price is critical, not weight) — no earlier than 2035-2037. And even then, SSB has to compete with LFP 2.0 (LMFP), which will also become cheaper. In 10 years of observation, no SSB developer has announced stationary BESS as a target market.

Toyota announced a breakthrough - is it true?

Toyota has more than 1,000 patents in the field of SSB and has shown prototypes with impressive characteristics (1,200 km range, 10 min of charging). However, these are laboratory samples at the level of single cells. From prototype to serial production — 3-5 years, even for car batteries. Toyota has repeatedly pushed back the production launch dates (first 2025, then 2027, now 2028). This is typical of SSB - "always in 3 years" technology.

What is a CATL "condensed battery"?

CATL Condensed Battery is a hybrid technology that uses a semi-solid electrolyte. This is not a full-fledged SSB, but a transitional technology of 500 Wh/kg. CATL is positioning it for electric aviation (eVTOL) rather than stationary BESS. For terrestrial storage, CATL continues to develop LFP (Shenxing, Shenxing Plus) and Na-Ion.

What type of SSB electrolyte is most promising?

For automotive applications — sulphide (highest conductivity, compatible with roll-to-roll production). For safety — oxide ceramics (LLZO). The most promising direction is composite electrolytes, which combine ceramics with a polymer: they are easier to manufacture and less fragile. However, neither type has yet solved the problem of dendrites at industrial charging currents.

How will SSB affect LFP battery prices?

Paradoxically, SSB accelerates the cheapening of LFP. Competition forces LFP manufacturers to invest in new technologies (LMFP, larger cells, automation). BloombergNEF predicts a decrease in the cost of LFP pack to $40-50/kWh by 2030 years. For a BESS buyer, this means: buy now for a reasonable price, and in 5 years the upgrade will be even cheaper.

Conclusions of BESS Ukraine

Solid State Battery is a real technological breakthrough, but for another market. EVs, aviation, medical devices — that's where SSB will change the game. For industrial storage systems in Ukraine, LiFePO4 remains the gold standard: cheap, reliable, proven, of 15-year resource.

The only risk is this the risk of inaction. While you are waiting for the "perfect battery", competitors are already saving on tariffs and making money on auxiliary services. Invest in proven technology today.