Hyun‐seung Kim 교수

Abstract The chemical composition significantly affects the inherent electrical surface properties of the graphite and SiO electrodes, which further, significantly alters the thermal stability of solid electrolyte interphase (SEI) on the negative electrodes. Because the work function of the graphite edge plane is lower than that of the SiO 2 ‐dominant SiO electrode when the electrode is initially lithiated, charge transfer toward the electrolyte is hindered by the high work function of SiO 2 . G

The individual moiety-functionalized organosilane single molecule, that is, 1,1,1,5,5,5-hexamethyl-3-[(trimethylsilyl)oxy]-3-vinyltrisiloxane (TMSV), is investigated as an electrolyte additive for a less charge-consuming and viscoelastic solid electrolyte interphase (SEI) forming agent, finally accomplishing extremely quick (6 min) rechargeable SiO/NCM811 lithium-ion batteries. The moiety of the vinyl group serves with a poly(ethylene oxide)-like viscoelastic SEI film on the SiO electrode, which

Abstract Individually functionalized cation‐ and anion‐based ionic additives are designed to mitigate the interfacial side reaction occurring on both the positive and negative electrode surfaces. By applying 1‐phenyl‐1 H ‐imidazole‐3‐ium trifluoromethanesulfonate as a surface‐targeting electrolyte additive, the reciprocal failure from multiple electrolyte addition applications is theoretically prevented. Selective interface modification is performed using ionic additives by the migration of cati

Though lithium-ion batteries (LIBs) have seen a meteoric rise in worldwide deployment over the last decade, they should be further advanced in constant demand of higher rate capability and wider temperature adaptability. A solid electrolyte interphase (SEI) is the essential part of LIBs, determining the charge-discharge performance and degradation behavior. Herein, improvement of the SEI properties is achieved by regulating the electrochemical double layer structure with a nonsacrificial electro

Abstract The persistent decomposition of electrolytes on graphite and silicon electrodes in lithium‐ion batteries (LIBs) is typically mitigated by the formation of a solid electrolyte interphase (SEI). However, the inadequate formation and chemo‐mechanical degradation of SEI leads to re‐exposure of electrode to electrolyte, contributing to the deterioration of LIBs. To address this issue, tris (2,4‐pentanedionato)indium(III) (InAc) is incorporated into the work function tailoring additive. While

Formation of the solid electrolyte interphase (SEI) on hard carbon electrode significantly influences the performance of batteries, in terms of cycle performance, calendar life, and power characteristics. In sodium-ion batteries (SIBs), the energetically inferior SEI formation mechanism, compared with lithium-ion batteries (LIBs), results in the formation of a thin, thermally vulnerable, and less passivating SEI on the hard carbon electrode. Notably, electrolyte for SIBs have a higher lowest uno

Abstract Despite considerable research efforts of lithium metal batteries (LMBs) in various aspects are performed, however the application as the power sources for transport vehicles remains challenging from the safety concerns and durability of LMBs. Therefore, to improve the safety and electrochemical performance of LMBs, a sophisticated separator composed of decabromodiphenyl ethane (DBDPE) and a CaO nanocomposite is engineered to concurrently impart the flame‐retardant properties and enhance

The critical mechanism underlying the degradation of the Li metal electrode and the positive electrode caused by operating voltage-dependent LiFSI-DME electrolyte decomposition is revealed.

To promote the reversible cycleability of Li metal negative electrodes, a Li-chelating azamacrocyclic ligand molecule is introduced into a carbonate-based electrolyte intended for lithium metal batteries. Reversible Li plating and stripping on the Cu electrode are found to be the outcomes of the bifunctional effects of adding the lithium nitrate-chelating azamacrocyclic ligand. The negatively shifted redox potential of the Li-chelating macrocyclic ligand, relative to that of the free Li-ion, act