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208 results on '"Kim, Hwa Soo"'

4. Improving the Trust Measuring on Social Networks Based on Ontology

Author

Thuy, Pham Thi Thu, Kim, Hwa Soo, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Tan, Kay Chen, Series Editor, Park, Ji Su, editor, Yang, Laurence T., editor, Pan, Yi, editor, and Park, James J., editor

Published
2024
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19. Toward a Nanoscale‐Defect‐Free Ni‐Rich Layered Oxide Cathode Through Regulated Pore Evolution for Long‐Lifespan Li Rechargeable Batteries

Author

Song, Seok Hyun, primary, Kim, Hwa Soo, additional, Kim, Kyoung Sun, additional, Hong, Seokjae, additional, Jeon, Hyungkwon, additional, Lim, Jun, additional, Jung, Young Hwa, additional, Ahn, Hyungju, additional, Jang, Jong Dae, additional, Kim, Man‐Ho, additional, Seo, Jong Hyeok, additional, Kwon, Ji‐Hwan, additional, Kim, Dokyung, additional, Lee, Young Joo, additional, Han, Young‐Soo, additional, Park, Kyu‐Young, additional, Kim, Chunjoong, additional, Yu, Seung‐Ho, additional, Park, Hyeokjun, additional, Jin, Hyeong Min, additional, and Kim, Hyungsub, additional

Published
2023
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26. Toward a Nanoscale‐Defect‐Free Ni‐Rich Layered Oxide Cathode Through Regulated Pore Evolution for Long‐Lifespan Li Rechargeable Batteries.

Author

Song, Seok Hyun, Kim, Hwa Soo, Kim, Kyoung Sun, Hong, Seokjae, Jeon, Hyungkwon, Lim, Jun, Jung, Young Hwa, Ahn, Hyungju, Jang, Jong Dae, Kim, Man‐Ho, Seo, Jong Hyeok, Kwon, Ji‐Hwan, Kim, Dokyung, Lee, Young Joo, Han, Young‐Soo, Park, Kyu‐Young, Kim, Chunjoong, Yu, Seung‐Ho, Park, Hyeokjun, and Jin, Hyeong Min

Subjects
*STORAGE batteries, *CATHODES, *PHASE transitions, *ELECTRIC batteries, *X-ray scattering, *ELECTRON scattering, *LITHIUM-ion batteries, *OXIDES
Abstract

Ni‐rich layered oxides are envisioned as the most promising cathode materials for next‐generation lithium‐ion batteries; however, their practical adoption is plagued by fast capacity decay originating from chemo‐mechanical degradation. The intrinsic chemical–mechanical instability, inherited from atomic‐ and nanoscale defects generated during synthesis, is not yet resolved. Here, atomic‐ and nanoscale structural evolution during solid‐state synthesis of Ni‐rich layered cathode, Li[Ni0.92Co0.03Mn0.05]O2, is investigated using combined X‐ray/neutron scattering and electron/X‐ray microscopy. The multiscale analyses demonstrate the intertwined correlation between phase transition and microstructural evolution, with atomic‐scale defects derived from the decomposition of precursors leading to the creation of intra/inter‐granular pores. The nucleation and coalescence mechanism of pore defects during the synthesis of Ni‐rich layered cathodes are quantitatively revealed. Furthermore, a modified synthetic route is proposed to effectively circumvent the formation of nanoscale defects in Ni‐rich layered cathodes by facilitating uniform synthetic reactions, resulting in superior electrochemical and microstructural stability. [ABSTRACT FROM AUTHOR]

Published
2024
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32. Upcycling spent cathodes into single-crystalline Ni-rich cathode materials through selective lithium extraction.

Author

Kim, Kyoung Sun, Jeon, Min Ku, Song, Seok Hyun, Hong, Seokjae, Kim, Hwa Soo, Kim, Sung-Wook, Kim, Jinsoo, Oh, Pilgun, Hwang, Junhyeok, Song, Jinju, Ma, Jiyoung, Woo, Jung-Je, Yu, Seung-Ho, and Kim, Hyungsub

Abstract

Direct recycling has been considered the most promising method of recycling spent batteries because of its eco-friendliness and cost-effectiveness. However, the uneven distribution of elements and particle sizes in spent cathode materials, caused by different states of health, presents a challenge for direct recycling. In this study, we employed a pre-treatment process using chlorination to selectively extract residual lithium and enhance the uniformity of the particle sizes in a spent LiNi0.6Co0.2Mn0.2O2 cathode. Furthermore, a multi-step aging process was designed to increase the primary particle size and minimize impurity formation, resulting in the successful synthesis of upcycled single-crystalline LiNi0.8Co0.1Mn0.1O2 (NCM811). The bimodal electrode, which contained both upcycled single-crystalline and commercially available polycrystalline NCM811, exhibited a large discharge capacity of 191.3 mA h g−1 at 0.2C and maintained a stable cycle performance of 84.1% after 300 cycles at 1C. Our study highlights the use of selective lithium extraction in the regeneration process, enabling the homogenization of the element distribution and particle size in spent cathode materials as well as the effective utilization of upcycled single-crystalline cathode materials. [ABSTRACT FROM AUTHOR]

Published
2023
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