Toyota and Big Oil Bet on Solid-State Batteries: Can They Beat Tesla | Taha Abbasi

Toyota Partners with Big Oil on Solid-State Batteries — A Threat to Tesla or a Detour?

Taha Abbasi has followed battery technology closely, and the latest development deserves careful analysis. Toyota and Idemitsu Kosan — one of Japan’s largest oil refining companies — have deepened their partnership on solid-state battery development, moving from a pilot program that began in 2023 into a full-scale commercialization push. The involvement of a petroleum giant in next-generation EV batteries is a fascinating strategic play that raises important questions about the future of battery technology.

Solid-state batteries have been the “holy grail” of EV technology for over a decade. They promise higher energy density, faster charging, longer life, and improved safety compared to lithium-ion cells. But they’ve also been perpetually “five years away.” Is the Toyota-Idemitsu partnership the one that finally delivers? And what does it mean for Tesla?

Why an Oil Company Is Investing in Batteries

Idemitsu Kosan’s involvement might seem contradictory — an oil refiner investing in technology that could accelerate its own obsolescence. But the logic makes strategic sense. Idemitsu has deep expertise in sulfide-based materials chemistry, which happens to be critical for one of the most promising solid-state electrolyte formulations. The company is essentially pivoting its chemical expertise from petroleum products to battery materials.

This is the smart play for fossil fuel companies. Rather than fighting the energy transition, some are positioning themselves as essential suppliers to the new energy economy. If Idemitsu can become a leading supplier of solid-state electrolyte materials, its revenue could grow even as gasoline demand declines. As Taha Abbasi has observed in analyzing Tesla’s valuation trajectory, the companies that will thrive in the next decade are those that position themselves on the right side of the energy transition — regardless of where they started.

What Toyota Claims About Solid-State

Toyota has been the most vocal major automaker about solid-state battery potential. The company claims its solid-state cells will offer:

• Roughly double the energy density of current lithium-ion cells
• Charging from 10% to 80% in under 10 minutes
• Improved safety with non-flammable solid electrolytes
• Longer cycle life, potentially exceeding 1,000 cycles with minimal degradation

If these claims hold at scale, it would be a genuine breakthrough. A solid-state battery with double the energy density would give a Model Y-sized vehicle 600+ miles of range, or alternatively allow a smaller, lighter, cheaper battery to achieve current range levels.

However — and this is crucial — Toyota has been making similar claims since at least 2017. Production timelines have repeatedly slipped. The latest target is pilot production in 2027-2028, with mass production potentially beginning in 2030. Taha Abbasi has learned to evaluate these announcements with healthy skepticism, noting that Tesla’s patent-to-production pipeline tends to move faster than competitors’ timelines suggest.

Tesla’s Battery Strategy: A Different Approach

While Toyota bets on solid-state, Tesla has taken a different path. The 4680 cell program focuses on incremental but manufacturable improvements to lithium-ion chemistry. Tesla’s approach prioritizes:

Manufacturing scalability: The 4680 dry electrode process is designed for high-volume, low-cost production. Even if solid-state batteries are theoretically superior, they’re useless if you can’t make millions of them affordably.

Continuous improvement: Tesla’s battery team iterates rapidly, improving energy density, cycle life, and cost with each generation. This steady improvement compounds over time — the gap between current lithium-ion and promised solid-state narrows with every year of delay.

Multiple chemistries: Tesla uses different cell chemistries for different products — LFP for standard-range vehicles, NMC for performance and long-range models. This flexibility allows optimization for each use case rather than betting everything on a single technology.

The Manufacturing Gap That Nobody Talks About

The fundamental challenge with solid-state batteries isn’t chemistry — it’s manufacturing. Creating a thin, uniform solid electrolyte layer at scale, maintaining the interface between solid electrolyte and electrode materials through thousands of charge cycles, and doing all of this at a cost competitive with mature lithium-ion manufacturing is extraordinarily difficult.

Toyota’s pilot production facilities produce cells in quantities measured in hundreds or thousands. Tesla’s Nevada and Texas battery factories are designed for annual production in the millions of cells. Bridging that gap — from lab-scale to mass-production — has killed more battery technologies than chemistry problems ever have.

This is why Taha Abbasi remains cautiously skeptical about solid-state timelines. The history of battery technology is littered with breakthroughs in the lab that never translated to the factory floor. Tesla’s approach of improving existing, manufacturable technology may prove more pragmatic than waiting for a revolutionary breakthrough.

What If Toyota Succeeds?

Let’s consider the scenario where Toyota delivers on its solid-state promises by 2030. Would this threaten Tesla’s dominance? The answer is nuanced.

First, battery technology is only one piece of the puzzle. Tesla’s competitive advantages include its Supercharger network, software ecosystem, manufacturing efficiency, and FSD technology. A better battery would improve any vehicle, but it wouldn’t automatically create a better total product.

Second, Tesla could adopt solid-state technology itself. Tesla’s cell design and manufacturing expertise would allow it to transition to solid-state cells if and when the technology proves manufacturable at scale. Tesla isn’t ideologically committed to lithium-ion — it’s committed to whatever technology delivers the best combination of performance, cost, and scalability.

Third, by 2030, Tesla will have accumulated four more years of data from millions of vehicles, further refinement of its FSD system, a functioning robotaxi network, and potentially a thriving Optimus robot business. A better battery from Toyota wouldn’t erase those advantages.

The Bottom Line

The Toyota-Idemitsu solid-state partnership is significant and worth watching. If it delivers, it could accelerate the EV transition by making electric vehicles lighter, cheaper, and faster to charge. But Taha Abbasi’s assessment is clear: the company that will define the future of transportation isn’t the one with the best battery cell — it’s the one with the best integrated system. And on that metric, Tesla’s lead continues to widen, solid-state promises notwithstanding.

About the Author: Taha Abbasi is a technology executive, CTO, and applied frontier tech builder. Read more on Grokpedia | YouTube: The Brown Cowboy | tahaabbasi.com