Researchers Engineered High-Entropy Sodium-Ion Cathode
The new layered-oxide material retained 90% capacity over 2,300 cycles in lab testing.
Updated on Sept. 22, 2026 in Energy
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Researchers have developed a high-entropy layered-oxide cathode designed to improve the longevity of sodium-ion batteries. This research-stage development demonstrated 90% capacity retention after 2,300 charge-discharge cycles in pouch cells.
Why it matters
Sodium-ion batteries often struggle with structural degradation caused by repetitive phase transitions between O3 and P3 crystal structures during operation. This new cathode architecture aims to mitigate that decay, potentially offering a more durable alternative to lithium-based systems.
The cathode achieved an energy density of 162.5 Wh/kg at a 0.1C rate and maintained 97.7% capacity during high-stress 5C charge and 1C discharge testing.
The players
Eastern Institute for Advanced Study
A research institution based in Ningbo that focuses on advanced materials and energy storage systems.
Hong Kong Polytechnic University
A research university known for its work in engineering and material sciences.
Chinese Academy of Sciences
A national academic institution that manages a vast network of research labs across scientific disciplines.
The details
The team utilized configurational entropy—the measure of disorder in a system—to stabilize the cathode lattice and manage structural behavior. By incorporating specific metal species, the researchers successfully regulated ion diffusion paths and hindered the damaging phase transitions between O3 and P3 crystal structures. The cathode was evaluated in ampere-hour-class pouch cells to better simulate real-world battery packaging.
Timeline
September 22, 2026: The research results were published.
The Tech Race
This study aligns with the global effort to move beyond lithium-dependent storage by improving the cycle stability of sodium-ion architectures. It follows a growing trend of applying high-entropy alloy concepts to stabilize crystal structures in electrochemical energy storage.
This technology remains in the research phase and is not yet available for commercial use. Future commercialization will depend on the researchers' ability to scale these results and prove performance in mass-produced battery formats.
The takeaway
The study suggests that high-entropy engineering is a viable path toward overcoming structural degradation in sodium-ion cells. Observers should track upcoming reports on how these cathodes perform when scaled from laboratory pouch cells to full-size battery modules.
Further reading
For broader context on current battery innovation, explore the latest research in /science/energy/.
Live Poll
Would you prefer using devices powered by cheaper, more abundant sodium-ion batteries over lithium-ion?
