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Two U.S.-based companies are betting on lithium-sulfur to compete with China.
By the time the Swedish battery giant Northvolt declared bankruptcy last month, a well-funded U.S. startup, Lyten, had already swooped in to snatch up the company’s previously shuttered Bay Area factory. With China flooding the market with its cheap lithium-ion tech, Lyten is betting that creating a fully domestic battery supply chain will require alternate chemistries — like, say, lithium-sulfur, Lyten’s recipe of choice.
Lithium-sulfur has long been a promising contender, as in theory, these batteries can have a much higher energy density — the amount of energy that can be stored in a given space — than traditional lithium-ion. They also rely primarily on cheap, abundant, and easy to access materials. “We don’t use nickel, we don’t use manganese, we don’t use cobalt, we don’t use graphite,” Keith Norman, Lyten’s chief sustainability officer, told me — all markets where China plays a leading role. Scaling up standard lithium-ion battery production to meet forecasted global demand would require opening nearly 400 new mines by 2035, according to Benchmark Mineral Intelligence. “We believe if you could snap your fingers and change that to lithium-sulfur, that mining requirement will be reduced somewhere between 80% and 90%,” Norman said.
Lyten’s customers, Norman said, want these batteries as soon as possible, and acquiring Northvolt’s old 200-megawatt plant will allow the company to begin commercial production there next year. Lyten also recently announced plans for a Reno-based gigafactory, which is scheduled to come online in 2027. Zeta Energy, a Houston-based lithium-sulfur startup, also aims to commercialize in 2025, and is set to announce the opening of its 100-megawatt plant in the coming weeks.
While both companies have dreams of enabling more efficient, lightweight, and cost-effective electric vehicles and energy storage systems, there are reasons why lithium-sulfur has yet to be commercialized.
For one, sulfur is generally a poor conductor of lithium ions, and therefore requires extra conductive material to compensate, increasing the battery’s weight. Lithium-sulfur batteries also have notoriously short cycle lives due to the “polysulfide shuttle effect,” which causes the sulfur in the cathode to dissolve in the liquid electrolyte, damaging the anode and — you guessed it — decreasing the battery’s capacity and cycle life.
“It could be solved,” Arumugam Manthiram, an engineering professor and battery researcher at the University of Texas at Austin, told me. After being involved in the initial lithium-ion battery breakthroughs of the 1980s, Manthiram said he’s seen traditional battery tech continue to improve year after year. He thinks lithium-sulfur will follow the same trajectory, only quicker. “Can it be solved in five years, 10 years? I’m optimistic.” he told me. He’s currently working with Lyten on a Department of Energy-funded grant to accelerate the commercialization of lithium-sulfur batteries for use in EVs.
Zeta thinks it’s already found the ticket, though. It claims to offer three times the energy density of traditional lithium-ion at less than half the price. While Melissa Schilling, Zeta’s head of strategic marketing and innovation, couldn’t reveal much about Zeta’s proprietary cathode, she did tell me that it’s made of a sulfur-carbon polymer that eliminates the dreaded polysulfide shuttle effect (a claim that’s been externally verified) and allows for greater electrical conductivity. The company’s lithium-metal anode is made of carbon nanotubes, a.k.a. tiny cylinders composed of carbon atoms. The nanotubes help improve the anode’s stability, thus increasing energy density compared with traditional graphite anodes while also preventing the formation of dendrites, tiny projections on the anode that can cause the battery to break down.
Zeta’s batteries can go through about eight times more charge/discharge cycles than traditional lithium-sulfur batteries, according to the company’s figures and Manthiram’s estimation of a typical life cycle. Optimizing these batteries for EVs, though, will likely mean a much shorter cycle life, which may not be on par with what lithium-ion can do. Even so, Schilling told me, “what we’re going to beat lithium-ion on is density and cost.” The company has raised $30 million to date, and is in the midst of raising its Series B round. While Schilling couldn’t reveal the names of Zeta’s initial customers, she told me that the company is collaborating with a large automaker and heavy equipment manufacturer. Zeta has also received the same commercialization grant from the DOE as Lyten.
For its part, Lyten currently provides 25% greater energy density than top-of-the-line lithium-ion batteries, Norman told me. The company expects that soon, it will be able to offer twice the energy density at half the material cost. Lyten’s tech relies upon a so-called supermaterial, three-dimensional graphene, which it’s developing in-house. This gets combined with sulfur in the cathode to form a more conductive and stable composite material.
Norman said you can think of 3D graphene like a sponge with pore sizes “perfectly designed to hold sulfur atoms.” The graphene “gives [the sulfur] conductivity and gives it a rigid structure that doesn’t allow it to break down as easily,” he told me, meaning the battery is less likely to succumb to the polysulfide shuttle effect. Lyten’s anode is also made of energy dense lithium-metal.
Lyten hasn’t publicly revealed its battery’s cycle life, however, and in a follow-up email, Norman told me that when it comes to EV batteries, Lyten is “not yet at the cycle life we need,” though the company is “seeing 20-30% improvement in lithium-sulfur battery performance each year.” For customers using lithium-sulfur for earlier-stage applications such as drones, satellites, and two- and three-wheelers, Norman wrote that Lyten’s current cycle life “meets or very nearly meets their requirements.”
The company seems to have the money to work towards these improvements. Lyten achieved “unicorn” status last year, recording a valuation over $1 billion after closing a $200 million Series B round. It counts Stellantis and FedEx among its backers, and the Department of Defense is even funding a demonstration of Lyten’s battery tech aboard the International Space Station, where lithium-sulfur cells will be tested for use in everything from satellites to space suits.
Norman told me the company’s recent purchase of Northvolt’s old Bay Area facility represents an important step in Lyten’s path to scale. The California plant was originally designed to produce lithium-metal batteries for Cuberg, a startup Northvolt acquired in 2021 and closed down this summer. Like Lyten’s and Zeta’s, Cuberg’s batteries used a pure lithium-metal anode, while its cathode was the same old nickel-manganese-cobalt chemistry that conventional lithium-ion batteries use. With this kind of chemistry, Norman told me, it would be “very difficult to ever compete on costs.”
One of the main ways that Northvolt ultimately went wrong, Norman and Schilling agreed, is that it tried to scale standard lithium-ion tech too quickly in a price-sensitive environment. “They kind of went right to these 10, 20, 30 gigawatt-hour facilities,” Norman told me. “As they tried to scale those, they ran into a lot of manufacturing challenges and just the cost and time of trying to learn that on these huge facilities kind of bit them.” Schilling told me she thinks QuantumScape, a manufacturer of solid-state batteries for EVs, is running the same risk.
To compete with the low-cost Chinese batteries flooding the market, Norman told me domestic tech has to be demonstrably better — incremental improvements in efficiency, cost, or sustainability will not be enough. “Fundamentally, you’ve got to have a differentiated battery that customers are really dying to get their hands on,” Norman told me. But he knows that if Lyten successfully commercializes lithium-sulfur, other companies and countries will quickly get into the game.
After all, major battery giants such as LG, Samsung, SK, and Panasonic are well aware of what’s going on in the lithium-sulfur space, Manthiram told me, even if they’ve yet to make any noise about it. “They are quietly doing some work, R&D. They don’t hype it because they have a product already made,” Manthiram said, referring to the company’s widely available lithium-ion batteries. “They are also watching what academic labs are doing, what Lyten is doing, what others are doing.”
These behemoths are sure to pounce when and if the timing is right. Yet Lyten and Zeta still have the opportunity to pioneer a novel battery technology that can be fully made in America — something thus far unheard of in the battery universe.
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The nonprofit laid off 36 employees, or 28% of its headcount.
The Trump administration’s funding freeze has hit the leading electrification nonprofit Rewiring America, which announced Thursday that it will be cutting its workforce by 28%, or 36 employees. In a letter to the team, the organization’s cofounder and CEO Ari Matusiak placed the blame squarely on the Trump administration’s attempts to claw back billions in funding allocated through the Greenhouse Gas Reduction Fund.
“The volatility we face is not something we created: it is being directed at us,” Matusiak wrote in his public letter to employees. Along with a group of four other housing, climate, and community organizations, collectively known as Power Forward Communities, Rewiring America was the recipient of a $2 billion GGRF grant last April to help decarbonize American homes.
Now, the future of that funding is being held up in court. GGRF funds have been frozen since mid-February as Lee Zeldin’s Environmental Protection Agency has tried to rescind $20 billion of the program’s $27 billion total funding, an effort that a federal judge blocked in March. While that judge, Tanya S. Chutkan, called the EPA’s actions “arbitrary and capricious,” for now the money remains locked up in a Citibank account. This has wreaked havoc on organizations such as Rewiring America, which structured projects and staffing decisions around the grants.
“Since February, we have been unable to access our competitively and lawfully awarded grant dollars,” Matusiak wrote in a LinkedIn post on Thursday. “We have been the subject of baseless and defamatory attacks. We are facing purposeful volatility designed to prevent us from fulfilling our obligations and from delivering lower energy costs and cheaper electricity to millions of American households across the country.”
Matusiak wrote that while “Rewiring America is not going anywhere,” the organization is planning to address said volatility by tightening its focus on working with states to lower electricity costs, building a digital marketplace for households to access electric upgrades, and courting investment from third parties such as hyperscale cloud service providers, utilities, and manufacturers. Matusiak also said Rewiring America will be restructured “into a tighter formation,” such that it can continue to operate even if the GGRF funding never comes through.
Power Forward Communities is also continuing to fight for its money in court. Right there with it are the Climate United Fund and the Coalition for Green Capital, which were awarded nearly $7 billion and $5 billion, respectively, through the GGRF.
What specific teams within Rewiring America are being hit by these layoffs isn’t yet clear, though presumably everyone let go has already been notified. As the announcement went live Thursday afternoon, it stated that employees “will receive an email within the next few minutes informing you of whether your role has been impacted.”
“These are volatile and challenging times,” Matusiak wrote on LinkedIn. “It remains on all of us to create a better world we can all share. More so than ever.”
A battle ostensibly over endangered shrimp in Kentucky
A national park is fighting a large-scale solar farm over potential impacts to an endangered shrimp – what appears to be the first real instance of a federal entity fighting a solar project under the Trump administration.
At issue is Geenex Solar’s 100-megawatt Wood Duck solar project in Barren County, Kentucky, which would be sited in the watershed of Mammoth Cave National Park. In a letter sent to Kentucky power regulators in April, park superintendent Barclay Trimble claimed the National Park Service is opposing the project because Geenex did not sufficiently answer questions about “irreversible harm” it could potentially pose to an endangered shrimp that lives in “cave streams fed by surface water from this solar project.”
Trimble wrote these frustrations boiled after “multiple attempts to have a dialogue” with Geenex “over the past several months” about whether battery storage would exist at the site, what sorts of batteries would be used, and to what extent leak prevention would be considered in development of the Wood Duck project.
“The NPS is choosing to speak out in opposition of this project and requesting the board to consider environmental protection of these endangered species when debating the merits of this project,” stated the letter. “We look forward to working with the Board to ensure clean water in our national park for the safety of protection of endangered species.”
On first blush, this letter looks like normal government environmental stewardship. It’s true the cave shrimp’s population decline is likely the result of pollution into these streams, according to NPS data. And it was written by career officials at the National Park Service, not political personnel.
But there’s a few things that are odd about this situation and there’s reason to believe this may be the start of a shift in federal policy direction towards a more critical view of solar energy’s environmental impacts.
First off, Geenex has told local media that batteries are not part of the project and that “several voicemails have been exchanged” between the company and representatives of the national park, a sign that the company and the park have not directly spoken on this matter. That’s nothing like the sort of communication breakdown described in the letter. Then there’s a few things about this letter that ring strange, including the fact Fish and Wildlife Service – not the Park Service – ordinarily weighs in on endangered species impacts, and there’s a contradiction in referencing the Endangered Species Act at a time when the Trump administration is trying to significantly pare back application of the statute in the name of a faster permitting process. All of this reminds me of the Trump administration’s attempts to supposedly protect endangered whales by stopping offshore wind projects.
I don’t know whether this solar farm’s construction will indeed impact wildlife in the surrounding area. Perhaps it may. But the letter strikes me as fascinating regardless, given the myriad other ways federal agencies – including the Park Service – are standing down from stringent environmental protection enforcement under Trump 2.0.
Notably, I reviewed the other public comments filed against the project and they cite a litany of other reasons – but also state that because the county itself has no local zoning ordinance, there’s no way for local residents or municipalities opposed to the project to really stop it. Heatmap Pro predicts that local residents would be particularly sensitive to projects taking up farmland and — you guessed it — harming wildlife.
Barren County is in the process of developing a restrictive ordinance in the wake of this project, but it won’t apply to Wood Duck. So opponents’ best shot at stopping this project – which will otherwise be online as soon as next year – might be relying on the Park Service to intervene.
And more on the week’s most important conflicts around renewable energy.
1. Dukes County, Massachusetts – The Supreme Court for the second time declined to take up a legal challenge to the Vineyard Wind offshore project, indicating that anti-wind activists' efforts to go directly to the high court have run aground.
2. Brooklyn/Staten Island, New York – The battery backlash in the NYC boroughs is getting louder – and stranger – by the day.
3. Baltimore County, Maryland – It’s Ben Carson vs. the farmer near Baltimore, as a solar project proposed on the former Housing and Urban Development secretary’s land is coming under fire from his neighbors.
4. Mecklenburg County, Virginia – Landowners in this part of Virginia have reportedly received fake “good neighbor agreement” letters claiming to be from solar developer Longroad Energy, offering large sums of cash to people neighboring the potential project.
5. York County, South Carolina – Silfab Solar is now in a bitter public brawl with researchers at the University of South Carolina after they released a report claiming that a proposed solar manufacturing plant poses a significant public risk in the event of a chemical emissions release.
6. Jefferson Davis County, Mississippi – Apex Clean Energy’s Bluestone Solar project was just approved by the Mississippi Public Service Commission with no objections against the project.
7. Plaquemine Parish, Louisiana – NextEra’s Coastal Prairie solar project got an earful from locals in this parish that sits within the Baton Rouge metro area, indicating little has changed since the project was first proposed two years ago.
8. Huntington County, Indiana – Well it turns out Heatmap’s Most At-Risk Projects of the Energy Transition has been right again: the Paddlefish solar project has now been indefinitely blocked by this county under a new moratorium on the project area in tandem with a new restrictive land use ordinance on solar development overall.
9. Albany County, Wyoming – The Rail Tie wind farm is back in the news again, as county regulators say landowners feel misled by Repsol, the project’s developer.
10. Klickitat County, Washington – Cypress Creek Renewables is on a lucky streak with a solar project near Goldendale, Washington, getting to bypass local opposition from the nearby Yakama Nation.
11. Pinal County, Arizona – A large utility-scale NextEra solar farm has been rejected by this county’s Board of Supervisors.