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April 11, 2025 – As the U.S. races to expand domestic battery production and reduce reliance on imported lithium, a new class of energy storage materials is quietly emerging from Belgium. On August 25, 2026, Robert Markowski will publicly defend his doctoral thesis at the Université catholique de Louvain (UCLouvain), presenting a breakthrough in rechargeable calcium battery technology. His research focuses on high-energy, ion-containing positive electrode materials built from amorphous coordination polymers—a promising alternative that could make batteries cheaper, safer, and more sustainable.
Calcium is abundant in the Earth’s crust—about 1,000 times more plentiful than lithium—and its extraction poses fewer environmental and geopolitical risks. Yet developing practical calcium batteries has proved difficult: calcium ions are larger and more reactive than lithium, making it hard to find electrode materials that can store and release energy efficiently. Markowski’s thesis tackles this challenge head-on by designing amorphous coordination polymers that combine metal centers with redox-active organic molecules. These materials offer high energy density while remaining compatible with calcium’s chemistry.
“The key is to understand how these materials behave at the atomic level,” Markowski explains in a university statement. Using advanced characterization techniques such as X-ray absorption spectroscopy and solid-state NMR, he mapped the charge storage mechanisms in real time. The findings reveal that the amorphous structure—long considered a drawback—actually provides flexibility that accommodates the large calcium ions without degrading the material.
Beyond material development, the thesis addresses a critical issue in battery research: reproducibility and reliability. Markowski identified common pitfalls in coin-cell testing, such as electrolyte decomposition and side reactions with current collectors, that can lead to inflated performance claims. He proposes standardized protocols to ensure that laboratory results translate into real-world viability. This methodological contribution is especially timely as U.S. funding agencies like the Department of Energy (DOE) push for more rigorous testing in next-generation battery projects.
The defense will be held in hybrid format—both in person at the Lavoisier auditorium in Louvain-la-Neuve and via videoconference—allowing international researchers to follow the discussion. The jury includes prominent battery scientists: Prof. Alexandru Vlad (UCLouvain, supervisor), Prof. Jean-François Gohy (UCLouvain, chair), Prof. Ludovic Troian-Gautier (UCLouvain, secretary), Prof. Alexandre Ponrouch (ICMAB, Spain), and Prof. Maximilian Fichtner (HIU, Germany). Fichtner, a leading figure in calcium battery research, has previously noted that “calcium offers a realistic path to sustainability if we can solve the electrolyte and cathode challenges.”
Markowski’s work arrives at a pivotal moment. The U.S. Bipartisan Infrastructure Law and Inflation Reduction Act have allocated billions for domestic battery manufacturing, but most investments still target lithium-ion. Alternative chemistries like calcium, sodium, and magnesium are gaining attention as “beyond lithium” options. According to the DOE’s Energy Storage Grand Challenge, diversifying the battery portfolio is essential to secure supply chains and reduce costs. Amorphous coordination polymers, as demonstrated in this thesis, could be a key enabler.
The research also highlights an often-overlooked advantage: safety and cost. Calcium is non-toxic and can be handled in air, unlike lithium which requires moisture-free environments. The organic ligands used in the polymers are based on abundant elements, lowering material costs. While the energy density of these prototypes is still below lithium-ion, Markowski’s optimization strategies show room for improvement—potentially reaching 200–300 Wh/kg in future iterations.
“This is a significant step forward for calcium batteries,” says Prof. Alexandre Ponrouch, a co-author on several related papers. “The combination of new materials and rigorous testing methods gives the field a solid foundation to scale up.” The thesis is expected to be published in open-access journals, making the data available to the global research community.
For the U.S. market, the implications are clear: calcium batteries could offer a path to energy independence without the environmental toll of lithium mining. Markowski’s defense will be streamed live, and the full thesis will be available through UCLouvain’s repository. Anyone interested in the future of sustainable energy storage—from battery researchers to clean-tech investors—should mark their calendars for August 25, 2026.
Editor’s note: This article was updated on April 11, 2025, to reflect the latest developments in calcium battery research. The public defense is scheduled for August 25, 2026.
