A new fast-charging battery anode developed by SeoulTech speeds up ion transfer and prevents capacity loss during high-rate charging.
Researchers at Seoul National University of Science and Technology have developed a new anode design that could significantly boost the performance, safety and lifespan of ultra-fast charging lithium-ion batteries. The breakthrough targets a major bottleneck in current battery tech by suppressing the chemical instability triggered by rapid charging a phenomenon that typically causes dangerous lithium plating and accelerated battery wear.
The study focuses on lithium titanium phosphate (LTP) an anode material with a NASICON crystal structure favored for its rapid ion diffusion and high thermal stability. While long considered a promising candidate for fast charging, LTP has historically struggled with low ionic conductivity and poor stability under extreme charging speeds.
To overcome these limits, researchers altered the material’s stoichiometry by intentionally raising the phosphorus-to-titanium ratio. This titanium-deficient structure triggers the formation of titanium phosphate (TPO) domains on the surface of the particles. These surface domains act as superhighways for lithium ions, lowering the energy barrier between the anode and electrolyte to speed up charging.
These TPO-rich regions also boost the material’s mechanical flexibility. The flexible phosphorus-oxygen-phosphorus (P–O–P) bonds absorb the structural stress caused by rapid charging cycles, protecting the framework from permanent damage. Together, faster ion movement and structural flexibility allow for higher charging speeds without sacrificing long-term battery health.
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Electrochemical testing confirmed a dramatic boost in fast-charging performance. When subjected to an aggressive 10C charge rate, the modified off-stoichiometric anode (OS-LTP/C) retained ~86% of its original capacity, while standard LTP/C anodes suffered severe capacity drops. The new material also demonstrated strong durability, maintaining stable operation across more than 250 cycles.
When paired with high-voltage cathodes in full-cell testing, the anode maintained its high-speed charging capabilities. This design strategy offers a practical pathway toward safer, ultra-fast charging lithium-ion batteries a critical step for advancing electric vehicles, consumer electronics, and grid-scale energy storage.
