A5044345370- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Supercapacitor Materials and Fabrication
- Advanced battery technologies research
- Advanced Battery Technologies Research
- Chemical Synthesis and Characterization
- Inorganic Fluorides and Related Compounds
- Transition Metal Oxide Nanomaterials
- Thermal Expansion and Ionic Conductivity
- Crystal Structures and Properties
- Copper-based nanomaterials and applications
- Semiconductor materials and devices
- Nanomaterials for catalytic reactions
- Muon and positron interactions and applications
Sungkyunkwan University
2021-2024
Sejong University
2018-2021
Government of the Republic of Korea
2018-2021
Suwon Research Institute
2021
Although high-voltage-stable halide solid electrolytes (SEs) have emerged, only a few Na+ SEs been developed thus far. Moreover, the use of expensive elements reduces suitability all-solid-state Na-ion batteries (ASNBs). Herein, new mechanochemically prepared orthorhombic NaAlCl4 is demonstrated to exhibit 10-fold enhancement in conductivity (3.9 × 10–6 S cm–1 at 30 °C) compared annealed samples. The feasibility for ASNBs also validated first time. X-ray Rietveld refinement with bond valence...
This study introduces a Na+ fluorinated halide nanocomposite solid electrolyte (HNSE), ZrO2-2Na2ZrCl5F, synthesized through mechanochemical reaction using Na2O. HNSE exhibits substantial improvement in conductivity (2.1 × 10–5 S cm–1 at 30 °C) compared to Na2ZrCl5F (2.0 10–7 cm–1). The significant reduction ionic of relative Na2ZrCl6 cm–1) is elucidated synchrotron pair distribution function (PDF) analysis. Structural insights, including the fine structure ZrO2 nanograins embedded an...
Abstract Despite their high energy densities, Li‐rich layered oxides suffer from low capacity retention and continuous voltage decay caused by the migration of transition‐metal cations into Li layers. The cation stabilizes oxidized oxygen anions through decoordination metal once participate in redox reaction. Structural disordering is thus considered inevitable most oxides. However, herein, a Mg‐substituted oxide, 1.2 Mg 0.2 Ru 0.6 O 2 , with structural electrochemical stability presented....
Abstract Although Li 2 MnO 3 exhibits high capacity via anionic oxygen redox, it suffers from rapid decay owing to structural disordering accompanying irreversible Mn migration and O release. To promote the reversibility of redox reaction, 1.8 Mg 0.3 0.9 as a novel cathode material, prepared by partially substituting + 4+ with redox‐inactive 2+ stabilizer is proposed. delivers specific energy density ≈310 mAh g −1 ≈915 Wh kg , respectively. In particular, power‐capability cycle performance...
Abstract As a promising candidates for next‐generation secondary battery system, sodium‐ion (Na‐ion) batteries and potassium‐ion (K‐ion) are recently attracting considerable attention because of their cost‐effectiveness similar reaction mechanism to that lithium‐ion batteries. However, the major challenges practical application sluggish ionic kinetic with excessive volume change cathode material, caused by larger radius than Li + ion. The current demand high energy density is not...
T-Na<sub>2</sub>Fe<sub>2</sub>F<sub>7</sub> based on three-dimensionally connected FeF<sub>6</sub> octahedra exhibits large specific capacity and ultra-high-stable cycling performance as a promising cathode for NIBs.
Abstract Grid‐scale energy storage system is the need of batteries with low‐cost, high‐energy‐density, and long cycle life. The requirement promotes discovery cathode materials enabling charge carrier ion within open framework crystal structure having multi‐dimensional diffusion path exhibiting small volume change. Herein, Na 2 TiFeF 7 reported as a promising fluoride‐based material for sodium‐ion (SIBs). Through combined studies using various experiments first‐principles calculations, it...
We report on Na4[Mn1.5Co1.5](PO4)2(P2O7) as a high-energy-density cathode material for sodium-ion batteries. Detailed structural information is obtained from Rietveld refinement of X-ray diffraction data. confirm that 2.7 mol Na+ ions per formula unit (116 mA h g–1) can be (de)intercalated the host structure using first-principles calculation and various electrochemical tests. Moreover, exhibits 73% capacity at C/10 retained even 10 C (84 g–1). Notably, delivers high retention ∼75% compared...
Abstract Layered‐type transition metal (TM) oxides are considered as one of the most promising cathodes for K‐ion batteries because large theoretical gravimetric capacity by low molar mass. However, they suffer from severe structural change de/intercalation and diffusion K + ions with ionic size, which results in not only much lower reversible than but also poor power capability. Thus, it is important to enhance stability layered‐type TM outstanding electrochemical behaviors under battery...
Na<sub>0.97</sub>KFe(SO<sub>4</sub>)<sub>2</sub> was successfully prepared <italic>via</italic> slow evaporation and a low-temperature process, its outstanding electrochemical performance demonstrated.
K<sub>4</sub>[Mn<sub>2</sub>Fe](PO<sub>4</sub>)<sub>2</sub>(P<sub>2</sub>O<sub>7</sub>) exhibits outstanding power-capability and stable cycle performance, with an average operation voltage of ∼3.5 V (<italic>vs.</italic> K<sup>+</sup>/K).
Herein, the Cu2P2O7/carbon–nanotube nanocomposite is reported as a cathode material based on conversion reaction for rechargeable sodium batteries (RSBs). The electrode exhibits large capacity of 355 mAh g–1, which consistent with 4 mol Na+ storage per formula unit determined by first-principles calculation. Its average operation voltage approximately 2.4 V (vs Na+/Na). Even at 1800 mA 223 g–1 maintained. Moreover, composite acceptable retention over 75% initial 300 cycles 360 g–1. overall...