Hoon‐Hee Ryu

Practical direct recycling of lithium-ion batteries via the state of recoverability

Hong-Geun Lee, Min-Ho Seo, Hyeok Kim, Hoon‐Hee Ryu et autres

Ultrathin Aluminum–Air Batteries via Hygroscopic Electrolytes for Continuous Operation of Imperceptible On‐Skin Electronics

Jaeil Park, Inho Lee, Namhee Kim, Wonseok Shin et autres

ABSTRACT On‐skin power sources require ultrathin form factors, safety, and mechanical robustness, but few battery platforms simultaneously satisfy these requirements. Here, we report the thinnest Al–air batteries to date (<270 µm) enabled by hygroscopic hydrogel electrolytes. Operating in a water‐in‐salt regime with …

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Understanding Residual Lithium Compounds in Layered Cathodes for Li-Ion Batteries

Jeong Eun Kim, Geurin Kim, Hoon‐Hee Ryu, Woo-Jin Song

Residual lithium is a critical issue in layered cathode materials for Li-ion batteries, often arising during synthesis and storage. Its presence can lead to undesirable side reactions, surface instability, and reduced electrochemical performance. Despite significant progress in cathode design, residual lithium remains …

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Significance of particle morphology: Semi-single-crystalline O3-Type Na[Ni1/3Fe1/3Mn1/3]O2 cathode for practical Na-ion batteries

Hyokyeong Kang, Seongje Ryu, Deokhyeon Son, Shivam Kansara et autres

O3-type Na[Ni 1/3 Fe 1/3 Mn 1/3 ]O 2 (O3-NFM) has been widely regarded as a promising cathode material for practical Na-ion batteries (NIBs) owing to its low cost and high reversible capacity. To advance the practical application of O3-NFM cathodes in …

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Hierarchical Conducting Bridging Network for Accelerated Charge Transport and Structural Stabilization of Li‐Mn‐Rich Cathodes

Somin Namkung, Dawon Jeong, Chanho Lee, Subi Yang et autres

ABSTRACT With the rapid deployment of electric vehicles (EVs), achieving high energy density and stable performance in lithium‐ion batteries (LIBs) has become a critical challenge. Lithium and manganese‐rich layered oxides (LMROs) are promising cathode materials owing to their high theoretical capacities; however, …

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Nanorod Cathodes: A Solution for Polycrystalline Cathodes in Next-Generation Lithium Batteries

Hoon‐Hee Ryu, Yang‐Kook Sun

As the demand for high-energy-density and safe lithium-ion batteries has increased, the limitations of conventional polycrystalline cathodes have become increasingly clear owing to their susceptibilities to mechanical degradation and electrolyte-driven side reactions. Among the emerging design strategies, nanorod structured cathode materials comprising …

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Single-Crystal vs Polycrystalline Cathodes for Lithium-Ion Batteries

Geon‐Tae Park, Hoon‐Hee Ryu, Nam-Yung Park, Soo-Been Lee et autres

As various applications increasingly demand Li-ion batteries (LIBs) with higher energy densities, cathode materials with extensively high Ni contents have been developed for LIBs. However, commercially available polycrystalline (PC) cathodes struggle to maintain structural stabilities due to severe cracking. In this regard, …

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Ni-Rich Li[Ni x Mn y Co 1– x – y ]O 2 Single Crystals as Superior Fast Charge Cathodes for Lithium-Ion Batteries

Murugan Vivekanantha, Hoon‐Hee Ryu, Guoying Chen

High Resolution Image Download MS PowerPoint Slide The utilization of single-crystal (SC) Li[Ni x Mn y Co 1– x – y ]O 2 (NMC) cathodes has facilitated unparalleled performance in commercial high-energy lithium-ion batteries (LIBs). In the current study, we evaluate the …

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Understanding Ni-Rich Layered Cathode Materials for Fast-Charging Li-Ion Batteries

Hoon‐Hee Ryu, Murugan Vivekanantha, Guoying Chen

The market for electric vehicles (EVs) has experienced significant growth, and this trend is expected to continue in the coming years. While the lithium-ion battery (LIB) technologies for EVs have made significant progress so far, they still face several disadvantages compared to …

Nano-rods in Ni-rich layered cathodes for practical batteries

Geon‐Tae Park, Nam-Yung Park, Hoon‐Hee Ryu, H. Hohyun Sun et autres

The nano-rod structure is a promising approach for developing high performance cathode materials. This review discusses nano-rod cathodes' origin, physicochemical, and electrochemical properties and their application in next-generation batteries.

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Near-surface reconstruction in Ni-rich layered cathodes for high-performance lithium-ion batteries

Hoon‐Hee Ryu, Sin Gyu Lee, Yang‐Kook Sun

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Ni-rich layered cathodes for lithium-ion batteries: From challenges to the future

Jun Yang, Xinghui Liang, Hoon‐Hee Ryu, Chong Seung Yoon et autres

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