
Meeting in the Space Cafe and a Pact on a Napkin
Sarah’s path to battery recycling began in the unique tech hub of Luxembourg, where she worked for the space agency and her cofounder, Xenia, worked for a space startup. After meeting at a networking event called Space Cafe, they signed a literal napkin promising to build a company together one day. Three years later, after Xenia published a breakthrough method for extracting lithium from end of life batteries in Nature, she scanned the napkin and called Sarah to fulfill the promise.
Finding a Mission Worth the Founder Sacrifice
Having previously launched two purely profit driven e-commerce and luxury retail startups that failed, Sarah realized her third venture had to stand for something greater. As a passionate diver who has witnessed coral reefs dying for over 15 years, she wanted to dedicate her life and energy to a true environmental cause. Her academic professors had always insisted electric vehicles were not truly sustainable, and she set out to prove them wrong through scalable closed loop recycling.
Outcompeting Industry Giants via Aggressive Scaling
Based in Munich, ToZero achieved commercial delivery of recycled lithium in just two years with a team of only 10 to 15 full-time employees. In contrast, corporate competitors like BASF had over 200 people and a decade of R&D. Sarah explains that while big corporates waste years mapping out extensive risk portfolios before moving forward, her team skipped that entirely, choosing to scale directly up to 4,000 liter reactors just to see exactly where the chemistry would break.
The Geopolitical Squeeze and Becoming the Miner of Tomorrow
By 2030, global lithium demand is projected to soar to 3 million metric tons, but traditional mining is only on track to supply 180,000 metric tons. With China currently controlling 100% of the lithium supply chain, European and American politicians are only now waking up to the critical raw materials crisis. Furthermore, mid-sized legacy industries like ceramics, glass, and lubricants are getting entirely squeezed out of the market by massive EV buyers. ToZero positions itself as a cheaper, more reliable, and greener alternative local miner.
The Physics of Economics and the CapEx Advantage
Sarah points out that natural mining ore contains less than 1% lithium concentration, whereas a processed battery contains 4% to 6% concentration. Because they are starting with a highly concentrated feedstock, recycling is fundamentally and drastically cheaper than digging raw materials from the earth. Setting up a traditional mine requires up to 2 billion dollars and takes 10 to 15 years to become operational, while a ToZero recycling plant can be built in just two years at a capital expenditure that is 150 times cheaper.
Unveiling the "Frankenstein" Blueprint in 2026
Backed by a 11 million euro seed round from investors like Nordic Ninja and Honda, ToZero is currently building its first commercial demo facility in a historical German chemical park. Moving into 2026, the company's objective is to activate this first of its kind industrial plant, which Sarah affectionately dubs the Frankenstein because it plugs completely unproved subsystems together on a massive industrial scale. Once this facility successfully outputs lithium and graphite, it will serve as the repeatable blueprint for worldwide expansion into North America and Japan.
Sarah’s Advice for Deep Tech Founders
For entrepreneurs tackling complex engineering hurdles where speed is critical, Sarah advises a ruthless focus on data and fundamental assumptions, noting that she requires her team to write out formulas on whiteboards to back up claims. She also urges leaders to push their engineers completely out of their comfort zones. In physical science, you often cannot calculate every risk, meaning the only true way to discover your technological limits is to go 10 times bigger than where you feel safe and let the system break.
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