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Scientists watch a lithium battery's cathode turn brittle in real time

Scientists watch a lithium battery's cathode turn brittle in real time

New Capabilities

Real-time measurements reveal nickel-rich cathodes lose plasticity above 4.2 volts, a hidden aging mechanism

October 12th, 2026: Operando X-ray study maps cathode volume change

Overview

Updated Oct 25

Battery researchers have had to guess how a cathode's mechanical properties change during charging, because measuring them meant taking the battery apart. A team at Skoltech in Moscow watched it happen live, using a modified coin cell with a diamond probe pressed against the cathode while the battery ran.

The probe showed the cathode does not soften as it degrades. Above 4.2 volts it loses the ability to deform plastically, with the work of plastic deformation dropping by nearly a third, and particles crack more easily. Other groups are tracking the same problem by other means: on October 12, researchers at CNRS and Paris-Saclay reported operando X-ray measurements of how spinel cathodes swell and shrink while cycling.

Why it matters

If cathode embrittlement above 4.2 volts is a universal failure mode, battery makers may need to redesign high-voltage cathodes for electric vehicles and phones.

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Key Indicators

~30%
Drop in plastic deformation work
Work of plastic deformation dropped by almost a third during transition to the high-voltage H3 phase.
4.2 V
Voltage threshold for embrittlement
Above 4.2 volts, the cathode loses its ability to deform plastically, increasing crack risk.
NMC811
Cathode material studied
Nickel-rich cathode material (LiNi0.8Mn0.1Co0.1O2) used in high-energy-density batteries.

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People Involved

ES
Evgeny Statnik
Senior research scientist, Laboratory of Hierarchically Structured Materials, Skoltech Engineering Center
First author of the operando nanoindentation study
 Artem Abakumov
Artem Abakumov
Director, Skoltech Energy Center; distinguished professor, Skoltech
Co-author of the operando nanoindentation study
 Alexander Korsunsky
Alexander Korsunsky
Professor, Skoltech Engineering Center; head, Laboratory of Hierarchically Structured Materials
Co-author of the operando nanoindentation study

Organizations Involved

Skolkovo Institute of Science and Technology (Skoltech)
Skolkovo Institute of Science and Technology (Skoltech)
Research university
Lead institution for the study

A private research university in Moscow, Russia, established with support from MIT.
Lomonosov Moscow State University
Lomonosov Moscow State University
Public research university
Collaborating institution

Russia's oldest university, founded in 1755, and a partner on the study.
RC
IDEA Research Center
Research center
Collaborating institution

A research center that collaborated on the study.

Timeline

2 events Latest: October 12th, 2026 · 1 month ago

  1. Operando X-ray study maps cathode volume change

    Latest Research

    Researchers at CNRS and Université Paris-Saclay combined operando X-ray diffraction and X-ray absorption spectroscopy to track how lithium cobalt manganese oxide spinel cathodes expand and contract during cycling. Total volume change fell from 5.8% to 2.1% by diffraction as cobalt content rose across the series.

  2. Operando nanoindentation study published

    Research

    Skoltech team publishes first real-time mechanical measurements of a working battery cathode in the journal Measurement.

Scenarios

1

Operando nanoindentation spreads to other battery labs

Possible Resolves by End of 2028

Discussed by: The Skoltech team, which frames the technique as an extension of the operando research paradigm

Other research groups adopt the modified coin cell and nanoindentation approach to study mechanical degradation in different cathode materials, from lithium iron phosphate to solid-state electrolytes. The technique's value depends on whether labs can reproduce the modified cell design.

2

Embrittlement data reshapes high-voltage cathode design

Possible Resolves by End of 2028

Discussed by: The researchers, who note the data's value for calibrating multiscale computational models

Battery manufacturers use the plasticity-loss data to design cathodes that maintain mechanical robustness above 4.2 volts, through coatings, doping, or microstructure engineering. The finding gives engineers a concrete target: preserve plastic deformation capacity at high voltage.

3

Technique remains a niche research tool

Uncertain Resolves by End of 2028

Discussed by: Null scenario; the default if adoption stalls

The method stays in Skoltech's lab, used for occasional studies but not widely adopted, because the modified coin cell is difficult to reproduce or because other techniques prove more practical for routine battery testing.

4

Mechanical degradation becomes a standard design criterion for high-voltage cathodes

Possible Resolves by End of 2027

Discussed by: Multiple research groups publishing on cathode mechanical robustness, including studies in Joule and ACS Energy Letters

As separate groups publish on cathode cracking, embrittlement, and mitigation strategies like zirconium doping and protective coatings, battery manufacturers begin treating mechanical robustness as a first-class design criterion alongside energy density and cycle life. The Skoltech plasticity data would feed directly into this trend.

5

Alternative cathode chemistries sidestep the embrittlement problem

Uncertain Resolves by End of 2028

Discussed by: Researchers studying spinel cathodes at CNRS and Université Paris-Saclay

Instead of engineering layered nickel-rich cathodes to keep deforming plastically above 4.2 volts, cell makers shift toward materials whose crystal structure expands and contracts evenly, such as cubic spinels, where added cobalt cut measured volume change to roughly 2%. The Skoltech plasticity data would then describe a problem specific to layered oxides rather than a universal failure mode.

Historical Context

2 moments from history that rhyme with this story — and how they unfolded.

October 2013

Ebner et al. x-ray tomography of tin oxide batteries (2013)

Martin Ebner and colleagues at ETH Zurich used synchrotron x-ray tomography to watch a tin oxide battery electrode degrade in real time, tracking crack initiation and growth along preexisting defects as the battery cycled.

Then

The study showed that mechanical fracture and structural disintegration of electrodes cause capacity loss in conversion and alloying materials.

Now

It established x-ray tomography as a tool for studying mechanical degradation in operating batteries, but it could not measure mechanical properties directly.

Why this matters now

Ebner's work visualized mechanical damage in real time but couldn't quantify the mechanical properties that cause it. The Skoltech technique adds direct mechanical measurement to the operando toolkit.

2023

Chemomechanical stress-induced phase transformation in high-Ni cathodes (2023)

Researchers used deep-learning-aided super-resolution imaging to show that mechanical deformation during battery operation directly triggers phase transformation in commercial layered cathodes, distinct from the conventional delithiation-driven transformation.

Then

The finding revealed a new degradation pathway in nickel-rich cathodes.

Now

It suggested that stress-induced phase degradation is universal in layered cathode materials.

Why this matters now

This work connected mechanical stress to chemical change in cathodes. The Skoltech study provides the mechanical property data needed to model and predict such stress-driven degradation.

Sources

(9)
+3
Tech Xplore Measurement Science Matter ACS Energy Letters Scienmag Health Medicine Net Energy Innovation Review Joule