Jinkwang Hwang

This review summarises the properties and electrochemical performance of pseudo-solid-state electrolytes prepared using ionic liquids, along with insights into design strategies to improve their application in various secondary batteries.

Abstract High power and energy density, long cyclability, and tolerance for wide temperature (seasonal and daily operational temperature differences) must be considered to construct large‐scale sodium secondary batteries. In this regard, Na 3 V 2 (PO 4 ) 2 F 3 (NVPF) has become a subject of interest as a high‐performance positive electrode material owing to its high energy density. However, the high operating voltage of NVPF causes continuous decomposition of electrolytes during cycles, resultin

Abstract Anode‐free Na metal batteries are acclaimed for their high energy densities achieved through current collectors in situ plated with Na metal in the absence of active negative materials. The advancement of these devices hinges on the development of affordable current collectors for effective Na deposition and the design of advanced electrolytes with suppressed Na metal loss as measured against the poor cycling performance and safety issues associated with traditional organic electrolytes

Abstract Positive electrode materials with a wide operating temperature range and high energy and power densities are required for the construction of practical sodium secondary batteries. High performance is expected at elevated temperatures because electrode reactions and ion diffusion are enhanced under such conditions. In the present study, carbon‐coated Na superionic conductor‐type Na 3 V 2 (PO 4 ) 3 is prepared via a sol–gel method and investigated as a positive electrode material for sodi

ADVERTISEMENT RETURN TO ISSUEPREVViewpointNEXTBetween Promise and Practice: A Comparative Look at the Energy Density of Li Metal-Free Batteries and Li Metal BatteriesDi WangDi WangGraduate School of Energy Science, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, JapanMore by Di Wang, Jie QiuJie QiuGraduate School of Energy Science, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, JapanMore by Jie Qiu, Naoki InuiNaoki InuiGraduate School of Engineering, Kyoto University

Symmetric cell electrochemical impedance spectroscopy (SCEIS) is a powerful method to analyze electrode materials for secondary batteries. The EIS results are used to obtain information related to electrochemical processes such as charge-transfer resistance. In this study, SCEIS is employed to investigate the electrochemical performance of the Na2FeP2O7 positive electrode for sodium secondary batteries operating at temperatures ranging from room to intermediate temperatures using the ionic liqui

Practical sodium secondary batteries require high power, high energy density, and long cyclability. The NASICON-type Na3V2(PO4)3 (NVP) is often investigated as a positive electrode material due to its high operation voltage, structural stability, and high Na+ ion conductivity. To overcome its low electronic conductivity, NVP requires carbon-coating or the addition of conductive materials for practical use. In this study, carbon nanofibers (CNFs) are incorporated as a conductive material along wi

NaV₂(PO₄)₃ is prepared by chemical desodiation of Na₃V₂(PO₄)₃ using Cl₂ gas, and the mixture of Na₃V₂(PO₄)₃ and NaV₂(PO₄)₃ is used as a novel and reliable NASICON-type counter electrode for Na secondary battery tests.

The increase in the concentration of electrolytes for secondary batteries has significant advantages in terms of physicochemical and electrochemical performance. This study aims to explore a highly concentrated electrolyte for Na-ion batteries using a ternary salt system. The eutectic composition of the Na[N(SO₂F)₂]-Na[N(SO₂F)(SO₂CF₃)]-Na[SO₃CF₃] ternary molten salt system increases solubility into an organic solvent, e