Harvard develops a solid state battery that charges in minutes
Researchers at Harvard University have developed a new solid state battery that can be recharged in 10 minutes.
Harvard’s latest solid-state battery breakthrough
The lithium metal battery researchers developed at the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS) can also be charged and discharged at least 6,000 times — more than any other pouch battery cell.
The research published in Nature Materials describes a new way to make solid-state batteries with a lithium metal anode. Xin Li, Associate Professor of Materials Science at SEAS and senior author of the paper, said:
Lithium metal anode batteries are considered the holy grail of batteries because they have ten times the capacity of commercial graphite anodes and could drastically increase the driving distance of electric vehicles.
Our research is an important step toward more practical solid-state batteries for industrial and commercial applications.
One of the biggest challenges in designing solid-state batteries is the formation of dendrites on the surface of the anode. Dendrites are projections of metal that can build up on the lithium surface and grow like roots into the electrolyte. They pierce the barrier that separates the anode and cathode, causing the battery to short or even catch fire.
The dendrites form when lithium ions move from the cathode to the anode during charging, attaching to the surface of the anode in a process called plating. That creates an uneven, non-homogeneous surface on the anode, and allows dendrites to take root.
When discharged, that plaque-like coating needs to be stripped from the anode, and when plating is uneven, the stripping process can be slow and result in potholes that induce even more uneven plating in the next charge.
In 2021, the team designed a multilayer battery that sandwiched different materials of varying stabilities between the anode and cathode. This design prevented the penetration of lithium dendrites by controlling and containing them – but it didn’t stop them altogether.
But in this latest research, the researchers stop dendrites from forming by using micron-sized silicon particles in the anode to constrict the lithiation reaction and facilitate homogeneous plating of a thick layer of lithium metal.
In the Harvard researchers’ design, when lithium ions move from the cathode to the anode during charging, the lithiation reaction is constricted at the shallow surface and the ions attach to the surface of the silicon particle, but don’t penetrate further.
“In our design, lithium metal gets wrapped around the silicon particle, like a hard chocolate shell around a hazelnut core in a chocolate truffle,” said Li.
And, because plating and stripping can happen quickly on an even surface, the battery can recharge in about 10 minutes.
The researchers built a postage stamp-sized pouch cell version of the battery, which is 10 to 20 times larger than the coin cell made in most university labs. The solid-state battery retained 80% of its capacity after 6,000 cycles, outperforming other pouch cell batteries on the market today.
Harvard Office of Technology Development licensed the technology to Adden Energy, a Harvard spinoff company cofounded by Li and three Harvard alumni. Adden Energy has scaled up the technology to build a smart phone-sized pouch cell battery.
Electrek’s Take
This is yet another milestone achieved in the solid-state battery saga. The ultimate challenge is still the ability to mass-produce these batteries at a lower price than lithium-ion batteries. That will be the real game-changer for EVs.
Photo: BMW
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The new and improved Hyundai IONIQ 5, or the hot-selling Chevy Equinox EV? Which electric SUV makes the smarter lease? Here’s the rundown.
Over 607,000 electric vehicles were sold in the US in the first half of 2025, thanks to some big discounts. Many automakers are currently offering generous savings, as Trump’s “One Big Beautiful Bill” is set to end federal EV incentives at the end of September.
According to Cox Automotive’s latest EV Market Monitor report, EV incentives reached a record of nearly $8,500 in June, or about 15% off the average transaction price (ATP).
That’s more than double the incentives offered on gas-powered vehicles. Seven electric vehicles had an ATP below $40,000, including the Chevy Equinox EV. The Equinox EV was the top-selling EV in the price range.
Starting at just $34,995, GM calls it “America’s most affordable 315+ range EV.” The electric Equinox has already propelled Chevy to become the number two EV brand in the US behind Tesla.
Through the first half of the year, the Chevy Equinox EV accounted for nearly a third of GM’s electric vehicle sales. And it could have sold even more. A dealer in California reached out to Electrek, claiming they had to wait over a month to receive Equinox EV models. It’s now on track to be among the top three selling EVs in the US.
Which EV to lease: Chevy Equinox EV or Hyundai IONIQ 5
With leases starting at just $289 per month, it’s no wonder the electric SUV is flying off the lot. The offer is for 24 months with $3,909 due at signing.
Alternatively, you can opt for 0% APR financing for 60 months, which Chevy is offering on all 2025 electric vehicle models.
| 2025 Chevy Equinox EV trim | Starting Price | EPA-estimated Range | Monthly lease Price (July 2025) |
| LT FWD | $34,995 | 319 miles | $289 |
| LT AWD | $40,295 | 307 miles | $351 |
| RS FWD | $45,790 | 319 miles | $416 |
| RS AWD | $49,090 | 307 miles | $453 |
The base 2025 Chevy Equinox EV LT starts at $34,995 with up to 319 miles of range. The interior boasts up to 57.2 cu ft of space and a 17.7″ infotainment screen.
How does it compare to the IONIQ 5? Hyundai has upgraded its best-selling electric SUV with major improvements, including increased range (now up to 318 miles), a revamped interior and exterior, and a built-in NACS port to access Tesla Superchargers.
After cutting lease prices again this month, the 2025 Hyundai IONIQ 5 is currently listed at just $179 per month.
However, that’s for the base SE mode, which has an EPA-estimated driving range of 245 miles. The longer-range IONIQ 5 SE RWD, with 318 miles range, can still be leased for just $199 per month right now. Both offers are for 24 months with $3,999 due at signing.
| 2025 Hyundai IONIQ 5 Trim | EV Powertrain | Driving Range (miles) | Starting Price* | Monthly lease price July 2025 |
| IONIQ 5 SE RWD Standard Range | 168-horsepower rear motor | 245 | $42,500 | $179 |
| IONIQ 5 SE RWD | 225-horsepower rear motor | 318 | $46,550 | $199 |
| IONIQ 5 SEL RWD | 225-horsepower rear motor | 318 | $49,500 | $209 |
| IONIQ 5 Limited RWD | 225-horsepower rear motor | 318 | $54,200 | $309 |
| IONIQ 5 SE Dual Motor AWD | 320-horsepower dual motor | 290 | $50,050 | $249 |
| IONIQ 5 SEL Dual Motor AWD | 320-horsepower dual motor | 290 | $53,000 | $259 |
| IONIQ 5 XRT Dual Motor AWD | 320 horsepower dual motor | 259 | $55,400 | $359 |
| IONIQ 5 Limited Dual Motor AWD | 320-horsepower dual motor | 269 | $58,100 | $299 |
Hyundai is also throwing in a complimentary ChargePoint Level 2 home charger with the purchase or lease of a new 2025 IONIQ 5. All IONIQ 5 trims are listed with 1.99% APR financing for up to 60 months.
The 2025 Hyundai IONIQ 5 offers up to 59.3 cu ft of cargo space with a dual 12.3″ driver display and infotainment system setup.
Both the Hyundai IONIQ 5 and Chevy Equinox EV are hard to pass up right now, with lease prices expected to be as low as they will ever be.
Looking to snag the savings while they last? You can use our links below to find offers on the Chevy Equinox EV and Hyundai IONIQ 5 near you.
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Volkswagen’s ID.3 just got a gold star from the folks at ADAC, Europe’s largest automobile club. After four years of pushing the all-electric hatchback to its limits in a long-term endurance test, the VW ID.3’s battery still held 91% of its original capacity – a big win for EV durability.
Engineers at ADAC’s Test and Technology Centre in Landsberg am Lech, Germany, put the ID.3 Pro S through its paces, clocking over 160,000 kilometers (roughly 99,400 miles). That’s the full length of VW’s battery warranty – eight years or 160,000 km – and the car came out swinging.
The ID.3 Pro S is equipped with a 77 kWh net-capacity battery. Volkswagen guarantees that its ID. models will keep at least 70% of their original net battery capacity by the end of the warranty period. After the test, the ID.3 beat that benchmark by a long shot.
The ADAC didn’t baby this car, either. Over 40% of the charging was done using DC fast chargers, and the vehicle was frequently left at 100% charge between test drives, sometimes for days at a time. (That’s a no-no for battery longevity, but it’s precisely why this test matters.)
Engineers kept a close eye on the ID.3’s battery health between drives. They also regularly updated the vehicle software, including installing Volkswagen’s EV Route Planner, which calculates optimal charging stops using real-time traffic and charge level data. One major update even bumped up the charging rate to 170 kW.
The software upgrades didn’t just improve charging – they helped boost efficiency too, especially over short distances and during chilly winter temps (0–5C/32–41F).
Beyond battery life, the VW ID.3 also scored high marks for build quality. Even after all those kilometers, ADAC said the chassis, suspension, steering, and body were still in solid shape – no significant wear or issues.
ADAC’s big piece of advice is to keep your software up to date. That made a noticeable difference in range and driving experience over the four-year test.
Martin Sander, a Volkswagen board of management member responsible for sales, marketing and after sales, says the results show its ID. line (including the US-made ID.4s) is built to last. “A high battery capacity of over 90% after 160,000 kilometers confirms our ID. models are also very attractive as used cars and continue to meet the requirements of our customers.”
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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 Tesla announcing new Model 3 and Model Y variants, the robotaxi expansion wars, big Lucid news, and more
The show is live every Friday at 4 p.m. ET on Electrek’s YouTube channel.
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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’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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