by Willow Tohi, Natural News:
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- Researchers from POSTECH and KIER have created a groundbreaking anode material using nano-sized tin particles and hard carbon, enabling ultra-fast charging (20 minutes), high energy density and impressive longevity (90% capacity retention after 1,500 cycles).
- Traditional graphite anodes have a limited theoretical capacity of 372 mAh/g, restricting energy density and fast-charging capabilities. The new anode addresses these issues, potentially transforming EVs, grid-scale storage and portable electronics by reducing “range anxiety” and reliance on graphite.
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- The anode is developed through a two-step synthesis process — sol-gel and thermal reduction — which evenly disperses tin nanoparticles within the hard carbon matrix. This design minimizes volume changes during charging cycles and enhances structural stability, leveraging tin’s high capacity while mitigating its drawbacks.
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- The new anode achieves 1.5 times the volumetric energy density of graphite-anode batteries under fast-charging conditions and is compatible with sodium-ion batteries (SIBs), offering stable operation and rapid kinetics. This advancement is crucial for large-scale grid storage and reducing reliance on scarce lithium resources.
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- The anode’s versatility could revolutionize EV design, enabling faster charging and longer ranges, and significantly benefit the energy sector by making SIBs economically viable for grid storage. This innovation highlights the potential of material science to accelerate the transition to sustainable energy solutions.
In a significant leap for battery technology, researchers from POSTECH (Pohang University of Science and Technology) and the Korea Institute of Energy Research (KIER) have developed a novel anode material that addresses longstanding challenges in energy storage systems. The team combined nano-sized tin particles with hard carbon, resulting in an anode capable of ultra-fast charging (20 minutes), high energy density and exceptional longevity — retaining 90% of its capacity after 1,500 cycles. This advancement, published in ACS Nano, could revolutionize electric vehicles (EVs), grid-scale energy storage and portable electronics by mitigating “range anxiety” and reducing reliance on conventional graphite-based anodes.
Bypassing graphite’s limits
Graphite has long been the dominant material for anodes in lithium-ion batteries (LIBs), valued for its structural stability. However, its theoretical capacity plateau — a mere 372 mAh/g — has constrained energy density and fast-charging capabilities. For EVs, this translates to long refueling times and limited range, while grid systems struggle to store surplus renewable energy efficiently.
The POSTECH-KIER solution targets these pain points by leveraging hard carbon, a disordered carbon matrix riddled with micropores that allow swift ion diffusion. Unlike ordered carbons, hard carbon’s chaotic structure can easily accommodate swelling during lithium or sodium insertion, fostering mechanical resilience. Yet, its energy storage potential remains underutilized. Enter tin: a metal with a theoretical capacity over ten times that of graphite but plagued by a flaw — 260% volume expansion during charging—that fractures electrodes over time.
“The key was to marry the robustness of hard carbon with tin’s high capacity,” said Dr. Gyujin Song of KIER. “Our nanoscale approach suppresses tin’s vulnerabilities while amplifying its strengths.”
A synergistic nano-composite
The team’s innovation hinges on a two-step synthesis: a sol-gel process followed by thermal reduction. This method disperses tin nanoparticles uniformly within the hard carbon matrix, with diameters under 10 nm — small enough to minimize volume changes during charge/discharge cycles.
Critically, tin acts not just as an active material but also as a catalyst. During thermal treatment, it triggers partial crystallization of nearby hard carbon, enhancing its structural order. This “co-catalysis” stabilizes the electrode, while reversible Sn-O bonds formed during electrochemical cycles contribute to extra capacity via conversion reactions.
