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Start Over Author "Choi, In-Soon" Journal advanced energy materials
18 results on '"Choi, In-Soon"'

1. Lithium‐Ion Batteries: An Antiaging Electrolyte Additive for High‐Energy‐Density Lithium‐Ion Batteries (Adv. Energy Mater. 20/2020)

Author

Han, Jung‐Gu, primary, Hwang, Chihyun, additional, Kim, Su Hwan, additional, Park, Chanhyun, additional, Kim, Jonghak, additional, Jung, Gwan Yeong, additional, Baek, Kyungeun, additional, Chae, Sujong, additional, Kang, Seok Ju, additional, Cho, Jaephil, additional, Kwak, Sang Kyu, additional, Song, Hyun‐Kon, additional, and Choi, Nam‐Soon, additional

Published
2020
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2. An Antiaging Electrolyte Additive for High‐Energy‐Density Lithium‐Ion Batteries

Author

Han, Jung‐Gu, primary, Hwang, Chihyun, additional, Kim, Su Hwan, additional, Park, Chanhyun, additional, Kim, Jonghak, additional, Jung, Gwan Yeong, additional, Baek, Kyungeun, additional, Chae, Sujong, additional, Kang, Seok Ju, additional, Cho, Jaephil, additional, Kwak, Sang Kyu, additional, Song, Hyun‐Kon, additional, and Choi, Nam‐Soon, additional

Published
2020
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10. Batteries: Na4-α M2+α/2 (P2 O7 )2 (2/3 ≤ α ≤ 7/8, M = Fe, Fe0.5 Mn0.5 , Mn): A Promising Sodium Ion Cathode for Na-ion Batteries (Adv. Energy Mater. 6/2013)

Author

Ha, Kwang-Ho, primary, Woo, Seung Hee, additional, Mok, Duckgyun, additional, Choi, Nam-Soon, additional, Park, Yuwon, additional, Oh, Seung M., additional, Kim, Youngshol, additional, Kim, Jeongsoo, additional, Lee, Junesoo, additional, Nazar, Linda F., additional, and Lee, Kyu Tae, additional

Published
2013
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14. Optimization of Carbon- and Binder-Free Au Nanoparticle-Coated Ni Nanowire Electrodes for Lithium-Oxygen Batteries.

Author

Kim, Sun Tai, Choi, Nam‐Soon, Park, Soojin, and Cho, Jaephil

Subjects
*GOLD nanoparticles, *NICKEL, *NANOWIRES, *ELECTRODES, *LITHIUM cells
Abstract

A Au nanoparticle-coated Ni nanowire substrate without binder or carbon is used as the electrode (denoted as the Au/Ni electrode) for Li-oxygen (Li-O2) batteries. A minimal amount of Au nanoparticles with sizes of <30 nm on a Ni nanowire substrate are coated using a simple electrodeposition method to the extent that maximum capacity can be utilized. This optimized, one body, Au/Ni electrode shows high capacities of 921 mAh g−1Au, 591 mAh g−1Au, and 359 mAh g−1Au, which are obtained at currents of 300 mAg−1Au, 500 mAg−1Au, and 1000 mAg−1Au respectively. More importantly, the Au/Ni electrode exhibits excellent cycle stability over 200 cycles. [ABSTRACT FROM AUTHOR]

Published
2015
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15. Na4-αM2+α/2(P2O7)2 (2/3 ≤ α ≤ 7/8, M = Fe, Fe0.5Mn0.5, Mn): A Promising Sodium Ion Cathode for Na-ion Batteries.

Author

Ha, Kwang‐Ho, Woo, Seung Hee, Mok, Duckgyun, Choi, Nam‐Soon, Park, Yuwon, Oh, Seung M., Kim, Youngshol, Kim, Jeongsoo, Lee, Junesoo, Nazar, Linda F., and Lee, Kyu Tae

Abstract

A new polyanion-based compound, Na3.12M2.44(P2O7)2 (M = Fe, Fe0.5Mn0.5, Mn) is synthesized and examined as a cathode for Na ion batteries. Off-stoichiometric synthesis induces the formation of a Na-rich phase, Na3.32Fe2.34(P2O7)2 - a member of the solid solution series Na4-αFe2+α/2(P2O7)2 (2/3 ≤ α ≤ 7/8) - which delivers a reversible capacity of about 85 mA h g−1 at ca. 3 V vs. Na/Na+ and exhibits very stable cycle performance. Above all, it shows fast kinetics for Na ions, delivering an almost constant 72% reversible capacity at rates between C/10 and 10C without the necessity for nanosizing or carbon coating. We attribute this to the spacious channel size along the a-axis, along with a single phase transformation upon de/sodiation. [ABSTRACT FROM AUTHOR]

Published
2013
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16. Si-Encapsulating Hollow Carbon Electrodes via Electroless Etching for Lithium-Ion Batteries.

Author

Park, Yuwon, Choi, Nam‐Soon, Park, Sangjin, Woo, Seung Hee, Sim, Soojin, Jang, Bo Yun, Oh, Seung M., Park, Soojin, Cho, Jaephil, and Lee, Kyu Tae

Abstract

Remarkable improvements in the electrochemical performance of Si materials for Li-ion batteries have been recently achieved, but the inherent volume change of Si still induces electrode expansion and external cell deformation. Here, the void structure in Si-encapsulating hollow carbons is optimized in order to minimize the volume expansion of Si-based anodes and improve electrochemical performance. When compared to chemical etching, the hollow structure is achieved via electroless etching is more advanced due to the improved electrical contact between carbon and Si. Despite the very thick electrodes (30 ∼ 40 μm), this results in better cycle and rate performances including little capacity fading over 50 cycles and 1100 mA h g−1 at 2C rate. Also, an in situ dilatometer technique is used to perform a comprehensive study of electrode thickness change, and Si-encapsulating hollow carbon mitigates the volume change of electrodes by adoption of void space, resulting in a small volume increase of 18% after full lithiation corresponding with a reversible capacity of about 2000 mA h g−1. [ABSTRACT FROM AUTHOR]

Published
2013
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