Theion Secures €15M to Revolutionize Battery Tech with Lighter, Eco-Friendly Crystal-Sulfur Batteries
March 24, 2025
Dr. Ehmes emphasized the goal of positioning Europe as a leader in sustainable energy storage, aiming for CO2-neutral electric flights and improved EV range.
These new batteries are environmentally friendly, as they contain no cobalt or nickel and are produced without harmful mining practices, addressing critical environmental and human rights issues.
Theion claims that its cells could have a one-third lower carbon footprint and cost compared to conventional lithium-ion cells, thanks to the lower cost and abundance of sulfur.
The company aims for its batteries to achieve an energy density of 1,000 Wh/kg, with fast charging capabilities that allow for charging in just minutes.
Sulfur, the key material in Theion's batteries, is not only abundantly available but also offers higher energy per weight compared to traditional battery materials, enhancing overall efficiency.
Berlin-based Theion has successfully raised €15 million in a Series A funding round, led by Team Global, to enhance its innovative crystal-sulfur battery technology.
Under the leadership of Dr. Ulrich Ehmes, Theion is focused on developing sustainable battery technology that utilizes crystal-sulfur, aiming to create batteries that are three times lighter and more efficient than conventional options.
Theion's crystal-sulfur batteries are designed to weigh only one-third of current electric vehicle (EV) battery technologies, significantly reducing the overall weight of vehicles.
The material costs for Theion's batteries are significantly lower, with sulfur accounting for only 1% of the cost of nickel manganese cobalt (NMC) materials, and the production process consuming only one-third of the energy compared to traditional methods.
A major challenge for Theion is achieving longevity, with a target of maintaining battery performance over 1,000 charge/discharge cycles for commercial viability.
Theion's efforts are part of a broader trend in lithium-sulfur battery research, with various startups also pursuing commercialization of this technology by the end of the decade.
The advancements in Theion's technology could significantly impact various industries, including electric aviation, electric vehicles, and sustainable energy storage.
Summary based on 3 sources
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Sources

Green Car Reports • Mar 24, 2025
Sulfur-crystal battery could triple EV range without cobalt or nickel
The Driven • Mar 24, 2025
Funding landed for crystal sulphur battery technology that could slash weight of EV batteries
Silicon Canals • Mar 21, 2025
Berlin’s Theion secures €15M to transform battery tech with crystal-sulfur - Silicon Canals