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Japanese oil giant, Idemitsu Kosan, is building a new large-scale lithium sulfide plant that will supply the raw material for Toyota’s upcoming all-solid-state EV batteries.

New plant will supply Toyota’s all-solid-state EV batteries

Toyota has been promising to launch all-solid-state EV batteries for years, but those plans may finally be coming together.

Idemitsu announced on Thursday it will build a large-scale production plant for lithium sulfide, a raw material used in all-solid-state EV batteries.

All-solid-state batteries, often called the “holy grail” of EV battery tech, promise to deliver drastic improvements in driving range, charging speeds, and energy density. As the name implies, they feature a solid electrolyte rather than traditional lithium-ion batteries, which contain a liquid electrolyte.

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Japan’s Ministry of Economy, Trade, and Industry (METI) has already approved the planned construction site. It will cost around 21.3 billion yen ($142 million) and was deemed as a “plan for ensuring supply of storage batteries.”

Idemitsu aims to mass produce all-solid state batteries in 2027 and 2028. The plant will be able to produce 1,000 metric tons of lithium sulphide annually.

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Idemitsu’s value chain for solid electrolytes used in all-solid-state EV batteries (Source: Idemitsu)

The company’s executive officer Tetsuji Mishina told the media (via Reuters) at its oil refinery in China, where it will build the new facility.

Mishina also said Toyota would be its first customer before it plans to expand to others later. Toyota and Idemitsu have been working together since 2023 to develop solid electrolytes for the mass production of all-solid-state EV batteries.

Toyota-all-solid-state-EV-batteries
Toyota EV battery roadmap (Source: Toyota)

The new plant is another step in the right direction, part of Idemitsu and Toyota’s plans to commercialize all-solid-state EV batteries in 2027 to 2028.

In September, Toyota was granted a METI certification, which gave it the green light to build the new batteries in Japan.

Toyota-all-solid-state-EV-batteries
Toyota and Lexus EV concepts (Source: Toyota)

The approval comes as Japan looks to wean itself off dependence on China or South Korea for batteries and establish a stable local supply chain. Toyota and Idemitsu are among several leading Japanese companies investing a combined $7 billion (1 trillion yen) in domestic battery production.

Electrek’s Take

Will Toyota actually launch EVs powered by all-solid-state batteries? They have been touting the new battery tech for years, but it seems to have made some progress recently.

Meanwhile, others are already getting a head start. Mercedes-Benz began testing the “world’s first” production EV powered by solid-state batteries earlier this month.

Through its partnership with US-based Factorial Energy and Mercedes AMG High-Performance Powertrains (HPP), the company tested a slightly modified EQS with over 621 miles of driving range. Mercedes said it was “the first car powered by a lithium-metal solid-state battery on the road.”

Factorial is working with other major OEMs, including Stellantis. Next year, Stellantis plans to launch a series of electric Dodge Chargers powered by Factorials solid-state batteries.

Honda, Hyundai, and let’s not forget global battery leaders CATL and BYD, are also racing to launch the promising new battery tech.

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Day 1 of the Electrek Formula Sun Grand Prix 2025 [Gallery]

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Day 1 of the Electrek Formula Sun Grand Prix 2025 [Gallery]

Today was the official start of racing at the Electrek Formula Sun Grand Prix 2025! There was a tremendous energy (and heat) on the ground at NCM Motorsports Park as nearly a dozen teams took to the track. Currently, as of writing, Stanford is ranked #1 in the SOV (Single-Occupant Vehicle) class with 68 registered laps. However, the fastest lap so far belongs to UC Berkeley, which clocked a 4:45 on the 3.15-mile track. That’s an average speed of just under 40 mph on nothing but solar energy. Not bad!

In the MOV (Multi-Occupant Vehicle) class, Polytechnique Montréal is narrowly ahead of Appalachian State by just 4 laps. At last year’s formula sun race, Polytechnique Montréal took first place overall in this class, and the team hopes to repeat that success. It’s still too early for prediction though, and anything can happen between now and the final day of racing on Saturday.

Congrats to the teams that made it on track today. We look forward to seeing even more out there tomorrow. In the meantime, here are some shots from today via the event’s wonderful photographer Cora Kennedy.

Stay tuned for more!

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You’re reading Electrek— experts who break news about Tesla, electric vehicles, and green energy, day after day. Be sure to check out our homepage for all the latest news, and follow Electrek on Twitter, Facebook, and LinkedIn to stay in the loop. Don’t know where to start? Check out our YouTube channel for the latest reviews.

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Tesla sold 5,000 Cybertrucks Q2, Optimus is in chaos, plus: the Infinity Train!

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Tesla sold 5,000 Cybertrucks Q2, Optimus is in chaos, plus: the Infinity Train!

The numbers are in and they are all bad for Tesla fans – the company sold just 5,000 Cybertruck models in Q4 of 2025, and built some 30% more “other” vehicles than it delivered. It just gets worse and worse, on today’s tension-building episode of Quick Charge!

We’ve also got day 1 coverage of the 2025 Electrek Formula Sun Grand Prix, reports that the Tesla Optimus program is in chaos after its chief engineer jumps ship, and a look ahead at the fresh new Hyundai IONIQ 2 set to bow early next year, thanks to some battery specs from the Kia EV2.

Prefer listening to your podcasts? Audio-only versions of Quick Charge are now available on Apple PodcastsSpotifyTuneIn, and our RSS feed for Overcast and other podcast players.

New episodes of Quick Charge are recorded, usually, Monday through Thursday (and sometimes Sunday). We’ll be posting bonus audio content from time to time as well, so be sure to follow and subscribe so you don’t miss a minute of Electrek’s high-voltage daily news.

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Got news? Let us know!
Drop us a line at tips@electrek.co. You can also rate us on Apple Podcasts and Spotify, or recommend us in Overcast to help more people discover the show.


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Tesla launches Oasis Supercharger with solar farm and off-grid batteries

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Tesla launches Oasis Supercharger with solar farm and off-grid batteries

Tesla has launched its new Oasis Supercharger, the long-promised EV charging station of the future, with a solar farm and off-grid batteries.

Early in the deployment of the Supercharger network, Tesla promised to add solar arrays and batteries to the Supercharger stations, and CEO Elon Musk even said that most stations would be able to operate off-grid.

While Tesla did add solar and batteries to a few stations, the vast majority of them don’t have their own power system or have only minimal solar canopies.

Back in 2016, I asked Musk about this, and he said that it would now happen as Tesla had the “pieces now in place” with Supercharger V3, Powerpack V2, and SolarCity:

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All of these pieces have been in place for years, and Tesla has now discontinued the Powerpack in favor of the Megapack. The Supercharger network is also transitioning to V4 stations.

Yet, solar and battery deployment haven’t accelerated much in the decade since Musk made that comment, but it is finally happening.

Last year, Tesla announced a new project called ‘Oasis’, which consists of a new model Supercharger station with a solar farm and battery storage enabling off-grid operations in Lost Hills, California.

Tesla has now unveiled the project and turned on most of the Supercharger stalls:

The project consists of 168 chargers, with half of them currently operational, making it one of the largest Supercharger stations in the world. However, that’s not even the most notable aspect of it.

The station is equipped with 11 MW of ground-mounted solar panels and canopies, spanning 30 acres of land, and 10 Tesla Megapacks with a total energy storage capacity of 39 MWh.

It can be operated off-grid, which is the case right now, according to Tesla.

With off-grid operations, Tesla was about to bring 84 stalls online just in time for the Fourth of July travel weekend. The rest of the stalls and a lounge are going to open later this year.

Electrek’s Take

This is awesome. A bit late, but awesome. This is what charging stations should be like: fully powered by renewable energy.

Unfortunately, it will be much harder to open those stations in the future due to legislation that Trump and the Republican Party have just passed, which removes incentives for solar and energy storage, adds taxes on them, and removes incentives to build batteries – all things that have helped Tesla considerably over the last few years.

The US is likely going to have a few tough years for EV adoption and renewable energy deployment.

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