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22 results on '"Kim, Doyoub"'

7. Nanodiamond-Enhanced Nanofiber Separators for High-Energy Lithium-Ion Batteries

Author

Narla, Aashray, primary, Fu, Wenbin, additional, Kulaksizoglu, Alp, additional, Kume, Atsushi, additional, Johnson, Billy R., additional, Raman, Ashwin Sankara, additional, Wang, Fujia, additional, Magasinski, Alexandre, additional, Kim, Doyoub, additional, Kousa, Mohammed, additional, Xiao, Yiran, additional, Jhulki, Samik, additional, Turcheniuk, Kostiantyn, additional, and Yushin, Gleb, additional

Published
2023
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10. Water-Assisted Transformation of Aluminum Alloys to Ceramic Nanowires and Aerogels

Author

Wang, Fujia, primary, Sun, Zhijian, additional, Jhulki, Samik, additional, Fu, Wenbin, additional, Turcheniuk, Kostiantyn, additional, Johnson, Billy, additional, Kim, Doyoub, additional, Jain, Crystal, additional, Song, Ah-Young, additional, Zhang, Yawei, additional, Chen, Kaixi, additional, Narla, Aashray, additional, Hu, Wenqiang, additional, Wallack, Dov, additional, Wong, Chingping, additional, and Yushin, Gleb, additional

Published
2023
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12. Scalable Pore Engineering Strategy for Promoting Ion Transport and Rate Capability in Thick Li-Ion Battery Electrodes

Author

Kim, Doyoub, primary, Yushin, Gleb, additional, Magasinski, Alexandre, additional, Sun, Yueyi, additional, Wang, Baolin, additional, Narla, Aashray, additional, Lee, Seung-Hun, additional, Yoo, Hana, additional, Jhulki, Samik, additional, Song, Ah-Young, additional, Hah, Jinho, additional, Zhu, Ting, additional, and Alexeev, Alexander, additional

Published
2022
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18. Conversion of Mg‐Li Bimetallic Alloys to Magnesium Alkoxide and Magnesium Oxide Ceramic Nanowires.

Author

Luo, Shunrui, Turcheniuk, Kostiantyn, Song, Ah‐Young, Narla, Aashray, Kim, Doyoub, Magasinsky, Alexandre, and Yushin, Gleb

Subjects
OXIDE ceramics, MAGNESIUM alloys, NANOWIRES, STRAIN energy, INDUCTIVE effect, SEMICONDUCTOR nanowires, SILICON nanowires, MAGNESIUM oxide
Abstract

Technologically important composites with enhanced thermal and mechanical properties rely on the reinforcement by the high specific strength ceramic nanofibers or nanowires (NWs) with high aspect ratios. However, conventional synthesis routes to produce such ceramic NWs have prohibitively high cost. Now, direct transformation of bulk Mg‐Li alloys into Mg alkoxide NWs is demonstrated without the use of catalysts, templates, expensive or toxic chemicals, or any external stimuli. This mechanism proceeds through the minimization of strain energy at the boundary of phase transformation front leading to the formation of ultra‐long NWs with tunable dimensions. Such alkoxide NWs can be easily converted in air into ceramic MgO NWs with similar dimensions. The impact of the alloy grain size and Li content, synthesis temperature, inductive and steric effects of alkoxide groups on the diameter, length, composition, ductility, and oxidation of the produced NWs is discussed. [ABSTRACT FROM AUTHOR]

Published
2020
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22. Overcoming the Energy vs Power Dilemma in Commercial Li-Ion Batteries via Sparse Channel Engineering.

Author

Kim D, Magasinski A, Sun Y, Wang B, Narla A, Lee SH, Yoo H, Jhulki S, Song AY, Hah J, Zhu T, Alexeev A, and Yushin G

Abstract

Improvements in both the power and energy density of lithium-ion batteries (LIBs) will enable longer driving distances and shorter charging times for electric vehicles (EVs). The use of thicker and denser electrodes reduces LIB manufacturing costs and increases energy density characteristics at the expense of much slower Li-ion diffusion, higher ionic resistance, reduced charging rate, and lower stability. Contrary to common intuition, we unexpectedly discovered that removing a tiny amount of material (<0.4 vol %) from the commercial electrodes in the form of sparsely patterned conical pores greatly improves LIB rate performance. Our research revealed that upon commercial production of high areal capacity electrodes, a very dense layer forms on the electrode surface, which serves as a bottleneck for Li-ion transport. The formation of sparse conical pore channels overcomes such a limitation, and the facilitated ion transport delivers much higher power without reduction in the practically attainable energy. Diffusion and finite element method-based simulations provide deep insights into the fundamentals of ion transport in such electrode designs and corroborate the experimental findings. The reported insights provide a major thrust to redesigning automotive LIB electrodes to produce cheaper, longer driving range EVs that retain fast charging capability., Competing Interests: The authors declare no competing financial interest., (© 2024 The Authors. Published by American Chemical Society.)

Published
2024
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