‘Seize the oxygen’ technique boosts lithium-ion battery lifespan
by Riko Seibo
Tokyo, Japan (SPX) Dec 27, 2024
A group of researchers from POSTECH, led by Professor Jihyun Hong of the Division of Battery Engineering and Dr. Gukhyun Lim, has unveiled a key technique to increase the sturdiness of lithium-rich layered oxide (LLO) materials, a promising cathode for next-generation lithium-ion batteries (LIBs). Their findings, revealed in Vitality and Environmental Science, signify a serious step ahead within the improvement of high-energy-density, sustainable battery applied sciences.
LLO supplies present a 20% enhance in power density over conventional nickel-based cathodes by substituting nickel and cobalt with lithium and manganese. This makes them an economical and eco-friendly different for electrical autos and power storage programs (ESS). Nevertheless, widespread adoption has been hindered by capability fading and voltage decay throughout repeated charge-discharge cycles.
Addressing these challenges, the POSTECH researchers targeted on the destabilizing impact of oxygen launch throughout battery operation. By bettering the chemical stability of the cathode-electrolyte interface, they minimized oxygen launch, a main reason for structural instability. Enhancing the electrolyte composition, they achieved an 84.3% power retention charge after 700 cycles, in comparison with simply 37.1% retention after 300 cycles with typical electrolytes.
The group additionally recognized structural floor adjustments in LLO as vital to stability and lifespan. By concentrating on these adjustments, they diminished detrimental reactions comparable to electrolyte decomposition, additional bettering battery efficiency.
“Utilizing synchrotron radiation, we analyzed chemical and structural variations between the cathode floor and its inside,” mentioned Professor Jihyun Hong. “We found that floor stability is important for sustaining the fabric’s structural integrity and efficiency. This work opens new pathways for growing superior cathode supplies.”
The analysis highlights the vital significance of optimizing each electrolyte composition and cathode floor construction to beat the constraints of LLO supplies, paving the way in which for longer-lasting, high-performance lithium-ion batteries.
Analysis Report:Decoupling capacity fade and voltage decay of Li-rich Mn-rich cathodes by tailoring surface reconstruction pathways
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Pohang University of Science and Technology
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