Volkswagen-backed battery developer 24M Technologies has shared test data showcasing its Impervio separator technology, which helps reduce the risk of EV battery fires. The video footage below shows a side-by-side comparison of conventional EV cells overcharged with and without an Impervio separator in real-time, demonstrating the technology’s potential in the future.
24M Technologies is a US-based battery startup spun out of MIT that has redesigned the traditional battery cell using “SemiSolid” lithium-ion technology. Prospective benefits of these unique cells include 40% less production area, more efficient product recycling, and less CO2 during battery production.
In December 2021, we shared the news that Volkswagen Group had invested in the battery specialist as part of three separate partnerships to advance EV battery cell development and adjacent technologies.
With VW’s financial support, 24M announced a novel approach to EV battery recycling called “Liforever” this past March. This approach is implemented directly into the battery manufacturing process as a method to recycle all active battery materials like lithium iron phosphate (LFP) more efficiently and cost-effectively while bypassing the creation of black mass entirely.
In January 2024, 24M introduced a new approach to battery separators called “Impervio,” which addresses the growing concern of fire across EV battery cells, energy storage systems (ESS), and consumer applications when they are overcharged. You can learn more about how 24M’s Impervio separator helps reduce the risk of EV battery fires in the company’s explainer video here.
Most recently, 24M shared test data that visually demonstrates the potential of its Impervio separator, overcharging EV battery cells with and without the technology in real time. The results are encouraging.
24M data that shows its separator reduces EV battery fires
As a follow up to its initial announcement earlier this year, 24M Technologies has shared actual test data that exhibits how effective its Impervio technology can be at preventing EV battery fires.
24M explained that overcharging a battery cell, like those utilized in EVs, can lead to dendrite formation and an internal short, which can result in a fire or, even worse, an explosion. The Impervio separator obstructs dendrite propagation by controlling the cell at the individual electrode level, thus preventing dendrites from propagating and faulting. 24M also shared that its technology can prevent thermal runaway by monitoring a cell’s electrochemistry and implementing a failsafe in the event of a shorting out.
The company shared the following video of a side-by-side performance test of two separate 10 Ah NMC/graphite cells, one with an Impervio separator and one with a conventional separator, charged to 100%, then overcharged to 100% overcapacity or twice the specified maximum voltage.
As you can see in the video, the non-Impervio, off-the-shelf cells overheated via dendrite-caused micro shorts after 15 minutes, causing the battery to inevitably explode and catch fire after 38 minutes. The NMC cell with 24M’s Impervio technology, however, did not overheat or catch fire after an entire hour of overcharging. 24M Technologies president and CEO elaborated on the potential of the company’s Impervio separators:
Battery safety is a major roadblock to the widespread adoption of EVs. Recent EV fires around the globe have highlighted why new battery safety innovations are required. A sustainable energy future is only possible with innovations like Impervio, which can help prevent battery fires and create new opportunities for battery innovation
It will be interesting and exciting to see 24M’s Impervio technology implemented at a mass scale, as EV battery fires, although rare, are still a major concern for OEMs and consumers alike. It would also be nice to remove the talking point about EV fire risk from the conversation from naysayers and political pundits as an argument against EV adoption.
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Wind energy powered 20% of all electricity consumed in Europe (19% in the EU) in 2024, and the EU has set a goal to grow this share to 34% by 2030 and more than 50% by 2050.
To stay on track, the EU needs to install 30 GW of new wind farms annually, but it only managed 13 GW in 2024 – 11.4 GW onshore and 1.4 GW offshore. This is what’s holding the EU back from achieving its wind growth goals.
Three big problems holding Europe’s wind power back
Europe’s wind power growth is stalling for three key reasons:
Permitting delays. Many governments haven’t implemented the EU’s new permitting rules, making it harder for projects to move forward.
Grid connection bottlenecks. Over 500 GW(!) of potential wind capacity is stuck in grid connection queues.
Slow electrification. Europe’s economy isn’t electrifying fast enough to drive demand for more renewable energy.
Brussels-based trade association WindEurope CEO Giles Dickson summed it up: “The EU must urgently tackle all three problems. More wind means cheaper power, which means increased competitiveness.”
Permitting: Germany sets the standard
Permitting remains a massive roadblock, despite new EU rules aimed at streamlining the process. In fact, the situation worsened in 2024 in many countries. The bright spot? Germany. By embracing the EU’s permitting rules — with measures like binding deadlines and treating wind energy as a public interest priority — Germany approved a record 15 GW of new onshore wind in 2024. That’s seven times more than five years ago.
If other governments follow Germany’s lead, Europe could unlock the full potential of wind energy and bolster energy security.
Grid connections: a growing crisis
Access to the electricity grid is now the biggest obstacle to deploying wind energy. And it’s not just about long queues — Europe’s grid infrastructure isn’t expanding fast enough to keep up with demand. A glaring example is Germany’s 900-megawatt (MW) Borkum Riffgrund 3 offshore wind farm. The turbines are ready to go, but the grid connection won’t be in place until 2026.
This issue isn’t isolated. Governments need to accelerate grid expansion if they’re serious about meeting renewable energy targets.
Electrification: falling behind
Wind energy’s growth is also tied to how quickly Europe electrifies its economy. Right now, electricity accounts for just 23% of the EU’s total energy consumption. That needs to jump to 61% by 2050 to align with climate goals. However, electrification efforts in key sectors like transportation, heating, and industry are moving too slowly.
European Commission president Ursula von der Leyen has tasked Energy Commissioner Dan Jørgensen with crafting an Electrification Action Plan. That can’t come soon enough.
More wind farms awarded, but challenges persist
On a positive note, governments across Europe awarded a record 37 GW of new wind capacity (29 GW in the EU) in 2024. But without faster permitting, better grid connections, and increased electrification, these awards won’t translate into the clean energy-producing wind farms Europe desperately needs.
Investments and corporate interest
Investments in wind energy totaled €31 billion in 2024, financing 19 GW of new capacity. While onshore wind investments remained strong at €24 billion, offshore wind funding saw a dip. Final investment decisions for offshore projects remain challenging due to slow permitting and grid delays.
Corporate consumers continue to show strong interest in wind energy. Half of all electricity contracted under Power Purchase Agreements (PPAs) in 2024 was wind. Dedicated wind PPAs were 4 GW out of a total of 12 GW of renewable PPAs.
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In the Electrek Podcast, we discuss the most popular news in the world of sustainable transport and energy. In this week’s episode, we discuss the official unveiling of the new Tesla Model Y, Mazda 6e, Aptera solar car production-intent, and more.
As a reminder, we’ll have an accompanying post, like this one, on the site with an embedded link to the live stream. Head to the YouTube channel to get your questions and comments in.
After the show ends at around 5 p.m. ET, the video will be archived on YouTube and the audio on all your favorite podcast apps:
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Here are a few of the articles that we will discuss during the podcast:
Here’s the live stream for today’s episode starting at 4:00 p.m. ET (or the video after 5 p.m. ET):
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The Chinese EV leader is launching a new flagship electric sedan. BYD’s new Han L EV leaked in China on Friday, revealing a potential Tesla Model S Plaid challenger.
What we know about the BYD Han L EV so far
We knew it was coming soon after BYD teased the Han L on social media a few days ago. Now, we are learning more about what to expect.
BYD’s new electric sedan appeared in China’s latest Ministry of Industry and Information Tech (MIIT) filing, a catalog of new vehicles that will soon be sold.
The filing revealed four versions, including two EV and two PHEV models. The Han L EV will be available in single- and dual-motor configurations. With a peak power of 580 kW (777 hp), the single-motor model packs more power than expected.
BYD’s dual-motor Han L gains an additional 230 kW (308 hp) front-mounted motor. As CnEVPost pointed out, the vehicle’s back has a “2.7S” badge, which suggests a 0 to 100 km/h (0 to 62 mph) sprint time of just 2.7 seconds.
To put that into perspective, the Tesla Model S Plaid can accelerate from 0 to 100 km in 2.1 seconds. In China, the Model S Plaid starts at RBM 814,900, or over $110,000. Speaking of Tesla, the EV leader just unveiled its highly anticipated Model Y “Juniper” refresh in China on Thursday. It starts at RMB 263,500 ($36,000).
BYD already sells the Han EV in China, starting at around RMB 200,000. However, the single front motor, with a peak power of 180 kW, is much less potent than the “L” model. The Han EV can accelerate from 0 to 100 km/h in 7.9 seconds.
At 5,050 mm long, 1,960 mm wide, and 1,505 mm tall with a wheelbase of 2,970 mm, BYD’s new Han L is roughly the size of the Model Y (4,970 mm long, 1,964 mm wide, 1,445 mm tall, wheelbase of 2,960 mm).
Other than that it will use a lithium iron phosphate (LFP) pack from BYD’s FinDreams unit, no other battery specs were revealed. Check back soon for the full rundown.