Juncheol Hwang

Degradation‐Informed Temperature Analysis for Cycle Life Prediction of LiFePO 4 Batteries

Joonyoung Kee, Seokhyun Lee, Juncheol Hwang, Sangho Yoon et autres

ABSTRACT Understanding and predicting battery cycle life is crucial for the reliable operation of lithium‐ion cells, particularly under fast‐charging conditions. Conventional prognostic methods predominantly rely on electrochemical measurements such as capacity fade and internal resistance, which often require specialized testing protocols and …

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High-entropy Na layered oxide facilitating reversible oxygen capacity

Jongbeom Kim, Taesoo Kim, Juncheol Hwang, Sangho Yoon et autres

(HE-NLMO) is identified as the most thermodynamically stable composition. With understanding of thermodynamic phase stabilities, DFT calculations reveal that HE-NLMO enables spontaneous and structurally continuous Li-ion migration into tetrahedral sites within the Na layer during desodiation. Electronic structure investigations further show that …

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Modulating Chemical State of Cation Site for Fast and Reversible Na Ion Storage of Fluorophosphate Cathodes

Minjun Hwang, Juncheol Hwang, Gun Jang, Won Il Kim et autres

An ionic bond by modulating chemical states is proposed to facilitate the Na + diffusion kinetics of fluorophosphate cathodes for high-power-density sodium-ion batteries. Herein, the model of Na 3–2 x V 2– x Mo x (PO 4 ) 2 O 2 F …

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Understanding cation interlayer (non)migration in alkali-ion Cr layered oxides

Gwanghyeon Choi, Juncheol Hwang, Duho Kim

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Breaking structural symmetry to facilitate fast reaction kinetics

Seokhyun Lee, Juncheol Hwang, Sangho Yoon

Breaking the intrinsic symmetry in crystal structures is a promising design concept for developing high-performance battery materials, providing a pathway to fast lithium-ion transport.

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Electro‐Chemo‐Mechanical Domain to Enable Less Hysteretic Fast‐Charging

Tae Hwa Hong, Juncheol Hwang, Yoon Hak Lee, Joonyoung Kee et autres

Abstract A new avenue by transforming the conventional electrochemical domain into an electro‐chemo‐mechanical domain is proposed to achieve less hysteretic fast‐charging based on the three pictures: i) electro‐chemo‐mechanics, ii) phase transition kinetics, and iii) ionic kinetics. Each concept is demonstrated leading to …

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Unified design flow for facilitating fast Li kinetics in layered oxide cathodes

Juncheol Hwang, Duho Kim

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Data‐Driven Decoupling Structural Feature Correlation for Harnessing Anionic Capacity in Na Layered Oxide

Jongbeom Kim, Sangho Yoon, Taesoo Kim, Gwanghyeon Choi et autres

Abstract A data‐driven understanding of the reaction mechanism of the O3‐type Na[Li1/3Mn2/3]O2‐layered cathode model is systematically performed to decouple the complex correlations of covariate scale‐dependent variables in diagnosing and solving structural problems for facilitating nonhysteretic and reversible (nHR) oxygen capacities using interpretable …

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Improvement of Thermodynamic Phase Stability and High-Rate Capability of Li Layered Oxides

Ji Hwan Kim, Juncheol Hwang, Young‐Hoon Lee, Seok Hyun Song et autres

The use of elemental doping in lithium cobalt oxide (LCO) cathode material at high cutoff voltage is a widely adopted technique in the field of rechargeable batteries to mitigate multiple unfavorable phase transitions. However, there is still a lack of fundamental understanding …

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(In)Coherent-bond-networks in Ni-rich layered oxides for durable lithium-ion batteries

Sangho Yoon, Gwanghyeon Choi, Jaewoon Lee, Juncheol Hwang et autres

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Unified Picture of Cation Interlayer (Non)Migration in Alkali-Ion Layered Oxides

Gwanghyeon Choi, Juncheol Hwang, Duho Kim

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Unified Picture of Cation Interlayer (Non)Migration in Alkali-Ion Cr Layered Oxides

Gwanghyeon Choi, Juncheol Hwang, Duho Kim

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