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433 results on '"Hwang, Jang‐Yeon"'

111. Manganese and Vanadium Oxide Cathodes for Aqueous Rechargeable Zinc-Ion Batteries: A Focused View on Performance, Mechanism, and Developments

Author

Mathew, Vinod, primary, Sambandam, Balaji, additional, Kim, Seokhun, additional, Kim, Sungjin, additional, Park, Sohyun, additional, Lee, Seulgi, additional, Alfaruqi, Muhammad Hilmy, additional, Soundharrajan, Vaiyapuri, additional, Islam, Saiful, additional, Putro, Dimas Yunianto, additional, Hwang, Jang-Yeon, additional, Sun, Yang-Kook, additional, and Kim, Jaekook, additional

Published
2020
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113. Engineering Sodium-Ion Solvation Structure to Stabilize Sodium Anodes: Universal Strategy for Fast-Charging and Safer Sodium-Ion Batteries

Author

Zhou, Lin, primary, Cao, Zhen, additional, Zhang, Jiao, additional, Sun, Qujiang, additional, Wu, Yingqiang, additional, Wahyudi, Wandi, additional, Hwang, Jang-Yeon, additional, Wang, Limin, additional, Cavallo, Luigi, additional, Sun, Yang-Kook, additional, Alshareef, Husam N., additional, and Ming, Jun, additional

Published
2020
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117. A review on carbon nanomaterials for K‐ion battery anode: Progress and perspectives.

Author

Thakur, Amrit Kumar, Ahmed, Mohammad Shamsuddin, Park, Jimin, Prabakaran, Rajendran, Sidney, Shaji, Sathyamurthy, Ravishankar, Kim, Sung Chul, Periasamy, Somasundaram, Kim, Jaekook, and Hwang, Jang‐Yeon

Subjects
NANOSTRUCTURED materials, CARBON composites, COMPOSITE materials, LITHIUM-ion batteries, ENERGY density
Abstract

Summary: Li‐ion batteries (LIBs) are being used extensively in a wide range of applications owing to the facile preparation technology as well as a high energy density, which exceeds those of other commercial batteries. However, LIBs alone cannot satisfy the burgeoning energy demand due to Li‐resource constraints. Recently, K‐ion batteries (KIBs) have garnered the interest of the scientific community as promising alternatives for LIBs due to the abundance of K resources, the affordability of K, and its superior electrochemical properties. However, the development of KIBs is hindered by the slow development of appropriate anode materials that can accommodate the repeated intercalation/deintercalation of large K ions without sustaining significant structural damage. Thus, the development of appropriate anode materials is crucial for the realization of practically viable KIBs. Carbon nanomaterials are promising anode materials due to their remarkable potassiation/depotassiation ability, structural stability, and structural evolution from zero to three dimensions. It is anticipated that an evaluation of the recent advances in carbon and their composites anode materials for KIBs can facilitate the development of practically viable KIBs. This review comprehensively discusses recent developments in carbonaceous and their composites as anode materials for KIBs and provides a prospective for the next research step. [ABSTRACT FROM AUTHOR]

Published
2022
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118. Sulfurized Carbon Composite with Unprecedentedly High Tap Density for Sodium Storage.

Author

Jo, Chang‐Heum, Yu, Jun Ho, Kim, Hee Jae, Hwang, Jang‐Yeon, Kim, Ji‐Young, Jung, Hun‐Gi, and Myung, Seung‐Taek

Subjects
SODIUM-sulfur batteries, ENERGY density, SURFACE conductivity, TEREPHTHALIC acid, SODIUM, CARBON composites, CARBONACEOUS aerosols
Abstract

A novel sulfurized carbon decorated by terephthalic acid (TPA) and polyacrylonitrile (PAN), with unprecedently high tap density (≈1.02 g cm−3), is investigated. Room‐temperature sodium–sulfur batteries offer high energy density; however, the dissolution of the polysulfide is a major factor hindering their commercialization. This dissolution problem can be tolerated by inhibiting the formation of polysulfide through binding sulfur to the carbon structure of PAN. Low sulfur content and low volumetric energy density in the composite are other drawbacks to be resolved. Heat‐treated TPA induces a high‐density carbonaceous material with high conductivity. This TPA is partly replaced by PAN, and the produced carbon and sulfur are composited with dehydrated polyacrylonitrile (CS–DPAN), which exhibits higher conductivity and surface area than the sulfurized dehydrated polyacrylonitrile (S–DPAN). The CS–DPAN composite electrode exhibits excellent electrochemical performance, and the resulting volumetric capacity is also superior to that of the S–DPAN material electrode. Operando Raman and operando X‐ray diffraction analyses confirm that the increased capacity is realized via the avoidance of parasitic C60Na3 formation formed below 1 V, by adjusting the operation voltage range. This finding demonstrates the feasibility of carbon–sulfur composites as a high‐energy electrode material for rechargeable sodium batteries. [ABSTRACT FROM AUTHOR]

Published
2022
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149. In Situ Oriented Mn Deficient ZnMn2O4@C Nanoarchitecture for Durable Rechargeable Aqueous Zinc‐Ion Batteries.

Author

Islam, Saiful, Alfaruqi, Muhammad Hilmy, Putro, Dimas Yunianto, Park, Sohyun, Kim, Seokhun, Lee, Seulgi, Ahmed, Mohammad Shamsuddin, Mathew, Vinod, Sun, Yang‐Kook, Hwang, Jang‐Yeon, and Kim, Jaekook

Subjects
ALKALINE batteries, CRYSTAL structure, MANGANESE oxides, STORAGE batteries, CATHODES, MANGANESE, STOICHIOMETRY
Abstract

Manganese (Mn)‐based cathode materials have garnered huge research interest for rechargeable aqueous zinc‐ion batteries (AZIBs) due to the abundance and low cost of manganese and the plentiful advantages of manganese oxides including their different structures, wide range of phases, and various stoichiometries. A novel in situ generated Mn‐deficient ZnMn2O4@C (Mn‐d‐ZMO@C) nanoarchitecture cathode material from self‐assembly of ZnO‐MnO@C for rechargeable AZIBs is reported. Analytical techniques confirm the porous and crystalline structure of ZnO‐MnO@C and the in situ growth of Mn deficient ZnMn2O4@C. The Zn/Mn‐d‐ZMO@C cell displays a promising capacity of 194 mAh g−1 at a current density of 100 mA g−1 with 84% of capacity retained after 2000 cycles (at 3000 mA g−1 rate). The improved performance of this cathode originates from in situ orientation, porosity, and carbon coating. Additionally, first‐principles calculations confirm the high electronic conductivity of Mn‐d‐ZMO@C cathode. Importantly, a good capacity retention (86%) is obtained with a year‐old cell (after 150 cycles) at 100 mA g−1 current density. This study, therefore, indicates that the in situ grown Mn‐d‐ZMO@C nanoarchitecture cathode is a promising material to prepare a durable AZIB. [ABSTRACT FROM AUTHOR]

Published
2021
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150. Investigation of superior sodium storage and reversible Na2S conversion reactions in a porous NiS2@C composite using in operando X-ray diffraction.

Author

Vu, Trang Thi, Park, Sohyun, Park, Jimin, Kim, Seokhun, Mathew, Vinod, Alfaruqi, Muhammad H., Kim, Kwang-Ho, Sun, Yang-Kook, Hwang, Jang-Yeon, and Kim, Jaekook

Abstract

Herein, a nickel disulfide–carbon (NiS2@C) composite with an advanced architecture is proposed as a high-performance anode material for SIBs. The NiS2@C composite is prepared via a one-pot hydrothermal method using Ni-based metal–organic frameworks as a single precursor following the sulfidation route. The highly conductive and porous nature of NiS2@C not only provides high electronic conductivity and a facile Na+-ion diffusion pathway but also decreases the stress/strain of the material during the conversion reaction process. Hence, despite very low carbon contents (∼8.5 wt%), the proposed composite material demonstrates high initial capacity (800 mA h g−1), excellent long-term cycling ability over 500 cycles, and fast charge–discharge capability even at a high current density of 5 A g−1. For the first time, the reversible Na2S conversion reaction is investigated via in operando X-ray diffraction analysis. [ABSTRACT FROM AUTHOR]

Published
2020
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