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 US Department of Energy (DOE) today announced $1.2 billion in financing to replace Puerto Rico’s fossil fuel plants with solar and battery storage through 2032.
The DOE’s Loan Programs Office announced two conditional commitments and one loan closing to power producers in Puerto Rico. Each supports a project contracted with the Puerto Rico Electric Power Authority. The announcements include:
- The closing of a $584.5 million loan guarantee to subsidiaries of Convergent Energy to finance a 100 MW solar farm with a 55 MW (55 MWh) battery energy storage system (BESS) in the municipality of Coamo and BESS installations in the municipalities of Caguas (25MW/100MWh), Peñuelas (100MW/400MWh), and Ponce (up to 100MW/400MWh)
- A conditional commitment for a loan guarantee of up to $133.6 million to a subsidiary of Infinigen for a 32.1 MW solar farm with an integrated 14.45 MW (4.76 MWh) BESS, and a co-located standalone 50 MW (200 MWh) BESS expansion in the municipality of Yabucoa
- A conditional commitment for a loan guarantee of up to $489.4 million to a subsidiary of Pattern Energy for three stand-alone BESS in the municipalities of Arecibo (50 MW/200 MWh), and Santa Isabel (50 MW /200 MWh and 80 MW/320 MW), and a 70 MW solar farm with an integrated BESS in the municipality of Arecibo.
If all are finalized, these projects would more than double LPO’s support for utility-scale solar generation and battery energy storage in Puerto Rico.
LPO provides low-cost financing and a rigorous due diligence process, making it a valuable resource for Puerto Rico as it works to rebuild an affordable, reliable, and clean energy system. As a result of reliance on imported fuel, the persistent threat of tropical storms, and underinvested infrastructure, Puerto Ricans today face average energy costs that are twice the US average – all while consuming only one-quarter of the energy of the US per capita.
LPO’s initial loan to a power producer in Puerto Rico, Project Marahu, closed in October 2024, and when complete will add more than 200 MW of solar and up to 285 MW of stand-alone energy storage to Puerto Rico’s grid.
Through its September 2023 partial loan guarantee to Project Hestia, LPO also supports virtual power plant (VPP)-ready rooftop solar and battery storage installations in Puerto Rico. As a nationwide project, Hestia’s sponsor is committed to at least 20% of installations under Project Hestia going to homeowners in Puerto Rico.
As part of its procurement plan, Puerto Rico Electric Power Authority seeks to install 1,500 MW of battery storage and requires a minimum capacity of storage to be co-located with each utility-scale solar project. Energy storage systems currently online in Puerto Rico are being dispatched every day.
When including Marahu, LPO’s closed and conditionally committed financing supports over 100% of the capacity Puerto Rico Electric Power Authority aimed to procure under its initial request for energy storage project proposals, the first of six.
Read more: Cleantech investments to top fossil fuels for the first time in 2025
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Chevy just introduced new deals on the Equinox and Blazer EV models to make them even more affordable. With 0% interest and a new trade-in bonus, Chevy is offering over $5,000 in savings.
Chevy adds new Equinox and Blazer EV deals in January
Although the Chevy Equinox EV is already “the most affordable” EV in its class with over 315 miles range, it’s getting even cheaper.
Earlier this week, Chevy launched new deals on the 2024 Equinox and Blazer EV models. According to a note sent to dealers, viewed by CarsDirect, the electric SUVs are now available with 0% APR financing for 60 months. You can also choose from 0.9% AP for 72 months and 2.9% APR for 84 months.
This marks the best financing offer on Chevy’s newest EVs to date. The previous best rates were 0.9% APR for 60 months, 3.9% for 72 months, and 5.9% for the longer 84-month option.
On a 7-year $45,000 loan, online auto research firm CarsDirect estimates the new deals amount to around a $5,200 price cut. The lower APR rates are already offered on the Chevrolet Silverado EV pickup.
In addition, Chevy is offering a trade-in bonus of up to $3,000 on the Silverado EV and $1,000 on the electric Equinox and Blazer models. If you choose to lease, the bonus is cut in half: $1,500 for the Silverado and $500 for the electric SUVs.
Chevy’s new EV deals started on January 14 and run through March 3, 2025. The deals come as rivals like Hyundai and Ford recently launched new EV promotions.
On Thursday, Hyundai launched a new promo on the upgraded 2025 IONIQ 5, which includes monthly leases as low as $199 and a free ChargePoint home EV charger (or $400 charging credit). Meanwhile, Ford extended its “Power Promise” program earlier this month, which also includes a free home charger, among several other benefits.
The 2024 Chevy Equinox EV started at $41,900 with up to 315 miles range. Prices for the electric Chevy Blazer start at $43,690 with up to 279 miles range.
If you are ready to try out Chevy’s new electric SUVs for yourself, we’ve got you covered. You can use our links below to view offers on the Chevy Equinox, Silverado, and Blazer EV models near you.
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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 non-Tesla EVs getting Supercharger access, Cybertruck sales in the spotlight, Rivian getting some money from Biden, and more.
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