A Superior Battery Technology
Solid-state batteries (SSBs) represent a generational leap over legacy lithium-ion by fundamentally redesigning the cell's internal architecture to prioritize energy density and safety.
- Elimination of Bulky Graphite: In traditional batteries, graphite acts as a "host" for lithium ions, but it adds significant dead weight and volume. QuantumScape and Honda are moving toward anodeless or lithium-metal architectures, which eliminate this bulky host material entirely. By using pure lithium metal as the anode, these batteries can achieve drastically higher volumetric and gravimetric energy densities.
- Dendrite Mitigation: A historical failure of lithium-metal batteries has been "dendrites"—needle-like structures that grow during charging and short-circuit the cell. QuantumScape addresses this with a proprietary solid ceramic separator that acts as a physical and chemical barrier, preventing dendrites from penetrating even at high power.
- Removal of Liquid Electrolytes: Replacing volatile liquid electrolytes with solid separators removes the need for heavy cooling systems and reinforced "fire-walled" battery packs. This elimination of bulky liquid electrolyte and its associated hardware simplifies the pack design and improves inherent safety, as solid electrolytes are non-flammable.
- Gains in Range and Charging: The resulting weight advantage translates directly into extended driving range for EVs. Furthermore, because lithium ions do not have to diffuse through a thick graphite host, faster charging is "built-in"—QuantumScape has demonstrated <15-minute fast charging (10-80%) by removing this diffusion bottleneck.
A Radically Different Manufacturing Process
Given the overwhelming physical and economic advantages, the probability that the next generation of energy storage will be solid-state and manufactured via continuous processing is high. However, the market has yet to fully grasp that this transition is a "rip-and-replace" event, not a software update.
The machinery powering the most advanced contenders—such as QuantumScape’s specialized kilns and Honda’s high-speed continuous mixers and roll-presses—represents a total departure from the status quo. By eliminating graphite, plastic separator membranes, and liquid electrolytes, these companies are also eliminating the very processes that current gigafactories were built to perform.
Looking at the hardware footprint of these new entrants, a stark reality emerges: the existing production lines of the world’s lithium-ion "incumbents" cannot be retrofitted for this new paradigm. You cannot "patch" a liquid-filling station into a ceramic sintering line, nor can you easily convert batch-mixing vats into continuous-flow inline systems. For the giants of the lithium-ion era, their billions in existing CAPEX may soon transition from a competitive moat to a massive, stranded asset.
Fundamental Process Gaps: Conventional LIB lines are designed for liquid-based coating, stacking, and electrolyte filling. ASSBs replace these with radically different steps like solid electrolyte sintering, high-pressure assembly, and thin-film ceramic processing.
Infrastructure Mismatch: Most current factories lack the environmental controls (extreme dry rooms for sulfides) or the specialized high-pressure equipment (WIP or high-tonnage roll-presses) required for solid materials. A "retrofit" would likely require tearing out over 60–80% of the equipment, which is often more expensive than building a new facility from scratch.
Summary of Differences
The Investor’s Takeaway
The "continuity" mentioned by many experts usually refers to the cathode coating and some back-end assembly, but for leaders like QuantumScape and Honda, the "front-end" of the factory is being completely rewritten.
The capital markets are currently pricing Continuity. They believe the winners of today (CATL) will be the winners of tomorrow because they have the factories. How can we make this assessment that the market is pricing continuity? We can look first at the state of advancement of different Companies and then the market caps of the different Companies.
The "4 out of 9" Problem
Earlier this year, CATL—the undisputed king of lithium-ion—dropped a bombshell: their solid-state readiness is only a 4 out of 9. For a company that controls over a third of the world’s battery market, this was a rare admission of friction.
The admission that CATL is currently at a level 4 out of 9 in solid-state battery readiness was made by Dr. Robin Zeng, Chairman and CEO of CATL, during the World Power Battery Conference (specifically the 2024 event).
Dr. Zeng used a 1-to-9 scale to measure technological and manufacturing maturity—where level 1 is a basic concept and level 9 is mass-market commercialization. He stated that the industry's current peak is approximately a 4.
Industry Reporting: Tech and automotive outlets like TechNode documented this 4/9 rating in late April 2024 and March 2026, respectively, noting CATL's goal is to reach levels 7 or 8 by 2027.
CATL is currently leaning on WIP (Warm Isostatic Pressing). In the world of high-speed manufacturing, WIP is a dirty word. It is a batch process—slow, high-pressure, and expensive. It’s the equivalent of hand-pressing a vinyl record when your competitors are trying to stream digital files. CATL’s struggle isn’t the chemistry; it’s the "Scale-Up" trap: trying to force a slow, clunky process to move at the speed of a traditional liquid-electrolyte line.
Their "4 out of 9" rating (using the Technology Readiness Level or TRL scale) reflects the massive hurdle of moving from a lab success to a stable, high-volume production line.
Here is the breakdown of why CATL's approach, specifically their use of WIP (Warm Isostatic Pressing), signals a different path than QuantumScape or Honda:
The "WIP" Bottleneck
The fact that CATL is looking at Warm Isostatic Pressing is a huge tell.
- What it is: WIP involves putting the battery cells into a liquid-filled chamber and applying uniform, high pressure from all sides at a controlled temperature.
- The Problem: This is traditionally a batch process, not a continuous one. It is slow and expensive.
- Why they need it: Unlike liquid batteries, solid-state layers need "intimate contact." If there’s even a microscopic gap between the solid electrolyte and the electrode, the ions can't move. WIP "crushes" these layers together perfectly.
- The Continuity Break: This replaces the high-speed "stacking and filling" of a standard LIB line with a slow, heavy-machinery pressing stage.
CATL’s "4/9" Reality Check
CATL’s leadership (notably Robin Zeng) has been vocal that while the chemistry works, the manufacturing is the nightmare. Their low readiness score stems from:
- Solid Electrolyte Sensitivity: CATL is largely focused on sulfide-based solid electrolytes (which have better conductivity than ceramics). However, sulfides create toxic gas if they touch even a tiny bit of moisture in the air.
- Scaling the Pressure: Figuring out how to apply the pressure of a WIP process in a continuous roll-to-roll format is the "Holy Grail" they haven't solved yet.
CATL vs. Honda/QuantumScape
You are seeing two different "bets" on how to solve the same problem:
- Honda/QuantumScape: Attempting to build a new, continuous process from the ground up (like Honda's inline mixing and roll-pressing) to bypass the batch bottleneck.
- CATL: Currently stuck in the "high-performance/low-volume" stage where WIP is necessary to get the battery to work at all, but they haven't figured out how to make it "fast" yet.
Even Sk on had to throw the towel and move to WIP-free process but as we will see they are nowhere near Honda or QuantuScape in the level of progress.
The Graphite Question
While QuantumScape is anode-free, CATL has explored silicon-based anodes or lithium-metal for their solid-state research. However, because they are a massive incumbent, they are often trying to find a way to keep some existing machinery relevant, which adds to the complexity of their "readiness" score.
CATL's 2027 goal for "small-batch" production suggests they might start with WIP for high-end applications (like eVTOLs or luxury cars) before they ever find a way to make it a continuous process for mass-market EVs.
The pricing and the "final size" nature of QuantumScape and Honda's machinery is a look into the industrial reality of these companies. The market currently prices CATL as an incumbent with safety in continuity, while Honda and QuantumScape are priced for high-risk, high-reward "breakout" success.
The Industrial "Final Size" Advantage
QuantumScape and Honda have moved past the lab-bench scale where a 1cm² cell is manually "pressed." They are now at Technology Readiness Level (TRL) 6–7 for their respective paths, meaning the machinery is already at automotive module scale.
QuantumScape's "Scale-Out" Model:
There is a common misconception by the market that QuantumScape needs to scale-up. They don’t. Scaling up is the most difficult part and the reason the market has PTSD on battery startups is because the lab size battery never managed to graduate to production size, the machinery, the physics variables and constraints are completely different in a production line.
QuantumScape’s module is ALREADY at final size. In other words a large chunk of the machinery is ALREADY very similar to the final version of the manufacturing module. To use the analogy in computing, it’s a staging code that needs testing and some tweaks before going to production. We don’t need to rewrite the software into a new “VERSION” as was the case of the failed battery startups.
- Final Module Size: Their QSE-5 B-samples are already in a multi-layered, commercial-ready format.
- Cobra Process: This is their critical "final size" hardware. It doesn't need to be bigger to make a gigafactory; it needs to be replicated. This "copy-exact" approach reduces the risk of new physical failures that often occur when simply making a machine wider or faster.
- Honda's C3 Breakthrough:
- Demonstration Line (Sakura City): This facility is roughly 27,000 m² and was built specifically to "replicate mass production processes". This is the production-size equipment you have in there, they won’t need to find completely new equipment for mass production.
- C3 Building: This is where final electrolyte activation and module assembly happen. Honda’s focus is on validating the "speed per unit" on this final-scale machinery, meaning they are tuning a process that they already know fits the car.
scale-up, versus scale-out.
In summary QuantumScape looks like a B2 because the module is small, but they don’t need to scale-up they need to scale-out. "Scale-Out” meaning building more identical machines and fine tuning the existing ones rather than inventing bigger ones. This mimics the semiconductor "copy-exact" model, which has historically been more predictable than the experimental scale-ups seen in early-stage battery labs.
The Market Disconnect
The capital markets often price these three companies using very different lenses:
The Mispriced Discontinuity
The capital markets are currently pricing a "continuity" that doesn't exist. Investors looking at CATL’s massive market share assume that battery leadership is a game of chemistry and capital. It isn't. In the solid-state era, it is a game of mechanical deformation physics.
While CATL admits to a "4 out of 9" readiness—stuck in the slow, batch-heavy world of Warm Isostatic Pressing (WIP)—Honda and QuantumScape have already moved to final-size, continuous-flow machinery. The reason for this gap is fundamentally technical and, in Honda’s case, rooted in sixty years of knowledge that cannot be "bought" via a vendor catalog.
Honda: Manufacturing-Driven Electrochemistry
For Honda, the roll-press route isn't a new experiment; it is the culmination of 60 years of precision rolling expertise. Unlike most battery companies that buy off-the-shelf calendering equipment from vendors like Bühler or Hitachi and tune it after the fact, Honda defines the deformation physics first and builds the machinery to enforce it.
The "Powertrain" Pedigree
Honda is historically a powertrain company, not a body-in-white company. Since the 1960s, they have mastered the art of densifying surfaces and managing interfaces in:
- Bearing races and crankshafts (surface densification)
- Transmission plates and clutch friction layers
- FAA-approved turbofan engines (requiring elite crack defect control and powder metallurgy)
This history gives them an "unfair" advantage in solving the #1 problem in solid-state: Interfacial Impedance. Solid-state batteries fail at the interfaces, not in the bulk chemistry. Honda’s custom-built roll-press systems eliminate micro-voids and maintain intimate contact under cycling, suppressing crack initiation before it starts.
The Precision Edge
Honda’s machines are embodiments of a unique Japanese ecosystem. They achieve micron-level thickness control (±1–2 microns) and maintain pressure uniformity across meter-wide materials—tasks that require 5-7 key technologies that have existed in Japan for decades but remain out of reach for competitors who still import the ultra-thin copper foils only Japan can produce.
QuantumScape: An entirely new animal
While Honda refines the mechanical paths that enable them to go the continuous roll-press process, QuantumScape has leapfrogged the batch process entirely with its Cobra process. By moving to a self-contained, continuous-flow module, they have achieved a 25x improvement in heat treatment speed. Their machinery is already at "final size"—they aren't scaling up a lab experiment; they are scaling out a proven, modular unit.
The solid-state transition hurdle is not Mass Scaling requires a different set of keys. It’s a technical hurdle.
The Rip-and-Replace Reality
The hardware running at Honda’s Sakura City facility and QuantumScape’s San Jose labs proves that the existing lithium-ion infrastructure is a lot more seriously challenged than market participants who might not have looked under the hood might think (let alone investigate scientific papers about the problems of WIP process for solid state). You cannot retrofit a liquid-filling line into a precision mechanical deformation line.
https://pubs.acs.org/doi/10.1021/acsaem.5c02250
Summary:
There is little evidence that a Lithium dominance translates into a solid state dominance, there is evidence that a large portion of the manufacturing assets of a Lithium Ion Champion might not be transferable into a continuous solid state manufacturing line judging by the situation of Both Honda and QuantumScape. The transition seems not to be a transition but rather a discontinuity. The difficulty does not appear to be in the electrochemistry but in the manufacturing processes. There is no evidence that CATL is right now using a continuous process which has been decried by several scientific paper as not really the viable route. CATL has not publicly demonstrated a credible continuous solid-state manufacturing route. CATL is highly promotional and publicly active. If they had solved a true continuous solid-state route, we would likely have seen evidence already.
If you are a $400B company whose valuation partly depends on future battery leadership, and you possess a genuine breakthrough in continuous solid-state manufacturing, rational behavior would strongly favor signaling it. It is very unusual for a company that is considered the leader not to disclose information that would cement them as the leader in the market. It is important for valuation premium, customer confidence with OEMs and strategic buyers, talent attraction of engineers to join perceived winners, suppliers leverage, and competitive deterrence.
I’m not claiming CATL failed. I’m claiming that if CATL had solved a decisive next-generation bottleneck, the lack of visible signaling is unusual and economically irrational for a market leader. Look at NVIDIA!
We are in a probabilistic world and I believe there is a high probability that CATL tells the truth when they say they are facing difficulties in Manufacturing while their release are always about the WIP process so far.
Sk on has thrown the towel on WIP and is going into a continuous process. The barrier from Lithium-ion to solid state does not appear to be about scale but technical. For those reasons I believe that there is a continuity embedded in the pricing of CATL that might not exist, and there is a mispricing on Honda and QS, one is trading without any value for its advanced C1 facility (which means final size equipment) and QS which is B1 in terms of quantity of samples sent for testing BUT is in fact a C1 test as far as “final size” manufacturing equipment. For Edge subscribers we go more into depth about the valuations of Honda and QS.