A5022583737- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Advanced Battery Technologies Research
- Conducting polymers and applications
- Supercapacitor Materials and Fabrication
- Extraction and Separation Processes
- Advanced battery technologies research
- Analytical Chemistry and Sensors
- Radiopharmaceutical Chemistry and Applications
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Fuel Cells and Related Materials
- Ionic liquids properties and applications
- Advanced Thermoelectric Materials and Devices
- Electrochemical Analysis and Applications
- Graphene research and applications
- Solid-state spectroscopy and crystallography
- Chemical and Physical Properties in Aqueous Solutions
- Anodic Oxide Films and Nanostructures
- Semiconductor materials and devices
- Crystallography and molecular interactions
- Transition Metal Oxide Nanomaterials
- Thermodynamic properties of mixtures
- Peptidase Inhibition and Analysis
- Concrete Corrosion and Durability
Daegu Gyeongbuk Institute of Science and Technology
2016-2025
Keimyung University
2022
Government of the Republic of Korea
2018
Daegu University
2014
Kumoh National Institute of Technology
2008-2012
LG Chem (South Korea)
2005-2008
LG (South Korea)
2006-2007
KG Chemical (South Korea)
2006
Korea Advanced Institute of Science and Technology
1999-2001
Brookhaven National Laboratory
2001
Succinonitrile (SN, CN–[CH2]2–CN) is evaluated as an additive for improving thermal stability in ethylene carbonate (EC)-based electrolytes lithium ion batteries. Without any sacrifice of performance such cyclability and capacity, the introduction SN into electrolyte with a graphite anode LixCoO2 cathode leads to (1) reducing amount gas emitted at high temperature, (2) increasing onset temperature exothermic reactions (3) decreasing exothermal heat. The improvement considered be due strong...
Expanding the performance limit of current Li-ion batteries requires ion–ion and ion–solvent interaction, which governs ion transport behavior electrolytes, to be fully understood as a matter crucial importance. We herein examine ionic speciation conduction propylene carbonate (PC) electrolytes 0.1–3.0 M LiPF6 LiBF4 using Raman spectroscopy, dielectric relaxation spectroscopy (DRS), pulsed-field gradient NMR (PFG-NMR) spectroscopy. In both LiPF6–PC LiBF4–PC, free ions solvent-shared pair...
Abstract Ionic liquid (IL) electrolytes with concentrated Li salt can ensure safe, high‐performance metal batteries (LMBs) but suffer from high viscosity and poor ionic transport. A locally IL (LCIL) electrolyte a non‐solvating, fire‐retardant hydrofluoroether (HFE) is presented. This rationally designed employs lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), 1‐methyl‐1‐propyl pyrrolidinium bis(fluorosulfonyl)imide (P13FSI) 1,1,2,2‐tetrafluoroethyl 2,2,3,3‐tetrafluoropropyl ether (TTE)...
Abstract We report the interfacial study of a silicon/carbon nanofiber/graphene composite as potentially high-performance anode for rechargeable lithium-ion batteries (LIBs). Silicon nanoparticle (Si)/carbon nanofiber (CNF)/reduced graphene oxide (rGO) films were prepared by simple physical filtration and an environmentally-friendly thermal reduction treatment. The used materials self-supporting, binder-free LIBs. Reducing improves electron conductivity adjusts to volume change during...
Concurrent modification of linear carbonates combining alkyl-chain extension and alkoxy substitution enables thermally stable high-performance batteries by decreasing volatility increasing solvation ability simultaneously.
Vinylene carbonate (VC) has been the best performing solid electrolyte interphase (SEI) additive for current lithium-ion batteries (LIBs). However, it is also true that LIB technology being stagnated by limit set VC. This study introduces 3-fluoro-1,3-propane sultone (FPS) as a novel SEI to replace VC and another popular additive, 1,3-propane (PS). Both density functional calculations electrochemical experiments confirm presence of an electron withdrawing fluorine group favourable in terms...
Succinonitrile (SN) is investigated as an electrolyte additive for copper corrosion inhibition to provide overdischarge (OD) protection lithium ion batteries (LIBs). The anodic Cu corrosion, occurring above 3.5 V (vs Li/Li(+)) in conventional LIB electrolytes, suppressed until a voltage of 4.5 reached the presence SN. by SN ascribed formation SN-induced passive layer, which spontaneously develops on surface during first scan. layer composed mainly Cu(SN)2PF6 units, evidenced Raman...
The concentration polarization, in addition to the activation and ohmic polarizations, limits fast operation of electrochemical cells such as Li-ion batteries (LIBs). We demonstrate an approach mitigate polarization by regulating effective (i.e., mean ionic activity) Li ions. use acrylate-based gel polymer electrolyte (A-GPE) improved rate capability LIBs compared with its liquid counterpart. Electrochemical spectroscopic evidence confirms that unexpected power performance A-GPE is ascribed...
Magnesium batteries have received attention as a type of post-lithium-ion battery because their potential advantages in cost and capacity. Among the host candidates for magnesium batteries, orthorhombic α-V2O5 is one most studied materials, it shows reversible intercalation with high capacity especially wet organic electrolyte. Studies by several groups during last two decades demonstrated that water plays some important roles getting higher Very recently, proton was evidenced mainly using...
The marked difference in the ionic conductivities of linear carbonate (LC) electrolyte solutions despite their similar viscosities and permittivities is a long-standing puzzle. This study unraveled critical impact solvent conformational isomerism on salt dissociation 0.1–3.0 M LiPF6 dimethyl (DMC), ethyl methyl (EMC), diethyl (DEC) using Raman dielectric relaxation spectroscopies. extent LC solutions, which decreased order DMC > EMC DEC, closely related to fraction polar cis–trans...
Herein, we present a gel polymer electrolyte (GPE) improving nonflammability of lithium-ion batteries (LIBs) by blocking radical-initiated chain reactions which cause thermal runaway and finally fire issues. The that makes up the nonflammable GPE was (1) soluble in carbonate electrolytes, (2) cross-linkable presence popularly used lithium salt such as LiPF6, (3) gelated only with 2 wt % (4) radical-scavenging its functional side chains. Electrolytes having were thermally within battery cells...
Current Li-ion battery (LIB) electrolytes employ mixed solvents consisting of ethylene carbonate (EC) and linear carbonates (LCs). Notably, the ion conductivities EC/LC follow order dimethyl > ethyl methyl diethyl despite similar physicochemical properties three LCs. However, origin this remains elusive. In study, we elucidated important role conformational isomerism LC solvent on salt dissociation in 0.1–3.0 M LiPF6 solutions, using Raman spectroscopy dielectric relaxation spectroscopies,...
Solvation engineering plays a critical role in tailoring the performance of batteries, particularly through use highly concentrated electrolytes, which offer heterogeneous solvation structures mobile ions with distinct electrochemical properties. In this study, we employed spectroscopic techniques and molecular dynamics simulations to investigate mixed-cation (Li+/K+) acetate aqueous electrolytes. Our research unravels pivotal water facilitating ion transport within viscous medium. Notably,...
The “marionette” effect of various diluents in localized-high-concentration electrolytes subtly controls solvent and additive interactions refines interfacial chemistry for enhancing Li-ion battery performance, particularly extreme conditions.
By employing Li2NiO2 exhibiting the distinctively low coulombic efficiency at first cycle as a cathode additive, lithium-ion batteries can be tuned to exhibit cathode-limiting configuration that is inherently immune overdischarge abuse.