U.S. scientists have successfully "revived" lithium deposits, potentially extending battery life by up to 30%.
Release date:
2025-09-08
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The team led by Cui Yi, a materials scientist at Stanford University in the U.S., has achieved a groundbreaking advancement in lithium-ion battery technology.
The team led by Cui Yi, a materials scientist at Stanford University in the U.S., has achieved a groundbreaking breakthrough in lithium-battery technology. They successfully "revived" isolated lithium deposits (i-Li) through electrochemical control, extending the cycle life of experimental batteries by nearly 30%. The study sheds light on the dynamic behavior of lithium deposits during charging and discharging: during charging, the deposits slowly migrate toward the cathode, while during discharge, they move toward the anode. Building on this insight, the team innovatively introduced a "hybrid cycling strategy," which involves applying short, high-current discharge pulses immediately after conventional charging. This approach accelerates the migration of lithium deposits to the anode, effectively restoring electrical connections. Experimental results show that Li||Cu half-cells employing this strategy achieved a Coulombic efficiency exceeding 100% by the 11th cycle—representing a 20% reduction in capacity loss compared to continuous cycling protocols.
In-situ optical microscopy observations confirmed that lithium deposits regenerate via a worm-like migration mechanism driven by "front-end dissolution and rear-end deposition." The pressure-enabled in-situ battery setup developed by the research team further revealed that during discharge and rest periods, the dissolution of the solid electrolyte interphase (SEI) around lithium deposits helps reduce the insulating layer, thereby enhancing the reversibility of the process. This breakthrough not only offers fresh insights for the design of lithium-metal batteries but also demonstrates principles that can be extended to other metal systems, such as sodium and potassium, holding significant potential for advancing high-energy-density secondary batteries. Currently, the associated technology has entered the engineering validation phase and is poised for practical applications in electric vehicles and energy storage systems.
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