The operando experiment scanned the intact coin cell every few hours, building a 3-D chemical movie without opening the battery.
For the first time, scientists have watched a lithium-ion button cell corrode in real time, charting more than 10,000 charge cycles without cracking the battery open. The operando experiment pinpoints manganese loss as the earliest—and most damaging—step in capacity fade, data that battery makers can now use to redesign tomorrow’s high-energy cells.
A new way to watch batteries dieWhen a lithium-ion battery loses punch, the root causes hide inside layers just tens of micrometres thick. Until now, researchers could probe those layers only after sawing the cell apart, capturing a single “before” or “after” snapshot. A German consortium led by the Helmholtz-Zentrum Berlin and the Physikalisch-Technische Bundesanstalt has broken that bottleneck.The team tracked elemental currents inside a commercial coin cell for several weeks using a confocal micro-X-ray fluorescence spectrometer at the BLiX lab of TU Berlin. The cathode was a state-of-the-art nickel–manganese–cobalt oxide ; the anode, standard graphite. Scanning the intact battery every few hours under normal operating current, the researchers produced a 3-D chemical map with 10-µm depth resolution—fine enough to separate cathode, separator, anode, and metal back-plate.“Everything happened non-destructively,” said first author Dr Ioanna Mantouvalou of HZB. “We could quantify where each element migrated while the cell was still working.” The results appear in the journal Small.Early culprit: Migrating manganeseThe data show a two-stage ageing mechanism. During roughly the first 200 charge–discharge cycles , manganese atoms leach from the NMC lattice and drift through the separator, plating onto the carbon anode. Only trace levels of nickel and cobalt move at this point. Once a critical amount of manganese departs, dissolution slows inside the cathode. Still, reactions pick up in the separator and current-collector layers, triggering a broader breakdown of the electrochemistry.The finding is a warning flag because manganese is the cheapest and increasingly prevalent component in high-energy cathodes. “Knowing that Mn is the earliest mover lets manufacturers target coatings or electrolyte additives to pin it down,” Mantouvalou explained.Two labs, one pictureThe long-duration scans at BLiX supplied the degradation timeline; high-brilliance “snapshots” at PTB’s new MiFO microfocus beamline on the BESSY II synchrotron filled in atomic details. The confocal geometry, two tiny X-ray lenses aligned at a point inside the cell, captured both fluorescence and absorption spectra from the same voxel, boosting quantitative accuracy.Beamtime at a national synchrotron is precious, so the BLiX system’s ability to run days-long autonomous campaigns bridges a critical gap. “We can now reserve BESSY II for key intervals and let the lab spectrometer collect the rest of the movie,” Mantouvalou said.Beyond button cellsWhile the prototype experiment used a coin cell, the technique scales to stacked pouch or cylindrical formats and other chemistries. Any device with layers thinner than a human hair—solid-state electrolytes, fuel cells, even semiconductor stacks—can in principle be scanned.The study’s partners include the University of Münster and SyncLab researchers embedded at HZB. Funding came from the German Federal Ministry of Education and Research.“Quantitative, operando, layer-resolved data have been the missing piece in battery ageing research,” Mantouvalou noted. “With this toolset in place, we can attack capacity fade at the mechanism level, not just by trial and error.”
Battery Cell Battery Charge Battery Degradation Battery Electrolytes Electrochemistry Lithium Batteries Lithium Ion NMC X Ray
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