A5052130076- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Advanced Battery Technologies Research
- Extraction and Separation Processes
- Supercapacitor Materials and Fabrication
- Electrocatalysts for Energy Conversion
- CO2 Reduction Techniques and Catalysts
- Semiconductor materials and devices
- Copper-based nanomaterials and applications
- Surface and Thin Film Phenomena
- Advanced Photocatalysis Techniques
- Semiconductor materials and interfaces
- Ionic liquids properties and applications
- Quantum Dots Synthesis And Properties
- Intermetallics and Advanced Alloy Properties
- Advanced battery technologies research
- Advanced Memory and Neural Computing
- Electron and X-Ray Spectroscopy Techniques
- Zeolite Catalysis and Synthesis
- Molecular Junctions and Nanostructures
- Aluminum Alloys Composites Properties
Seoul National University
2020-2025
The era of miniaturized and customized electronics requires scalable energy storage devices with versatile shapes. From the perspective manufacturing, direct ink writing (DIW)-based 3D printing has attracted unprecedented interest, paving way to demonstrate micro-batteries design freedom outstanding performance. Despite demands for all-printed Li-ion batteries maskless processing, most efforts have been dedicated developing printable active electrodes or building architecture, remaining...
Stabilised Li-rich and Li-poor surface domains formed during fast lithiation delithiation, respectively, cause a large overpotential difference between discharging charging.
Understanding the cycling rate-dependent kinetics is crucial for managing performance of batteries in high-power applications. Although high rates may induce reaction heterogeneity and affect battery lifetime capacity utilization, such phase transformation dynamics are poorly understood uncontrollable. In this study, synchrotron-based operando X-ray diffraction performed to monitor high-current-induced LiNi0.6 Co0.2 Mn0.2 O2 . The sluggish Li diffusion at content induces different...
During solid-state calcination, with increasing temperature, materials undergo complex phase transitions heterogeneous reactions and mass transport. Precise control of the calcination chemistry is therefore crucial for synthesizing state-of-the-art Ni-rich layered oxides (LiNi1-x-y Cox Mny O2 , NRNCM) as cathode lithium-ion batteries. Although battery performance depends on chemical heterogeneity during NRNCM it has not yet been elucidated. Herein, through synchrotron-based X-ray,...
Elucidating high-rate cycling-induced nonequilibrium electrode reactions is crucial for developing extreme fast charging (XFC) batteries. Herein, we unveiled the distinct rate capabilities of a series Ni-rich layered oxide (NRLO) cathodes by quantitatively establishing their dynamic structure–kinetics relationships. Contrary to conventional views, discovered kinetic properties obtained ex-situ near equilibrium states failed assess effective capability NRLOs at ultrafast C rates. Further,...
Crosstalk, the exchange of chemical species between battery electrodes, significantly accelerates thermal runaway (TR) lithium-ion batteries. To date, understanding their main mechanisms has centered on single-directional crosstalk oxygen (O
Nanoscale cracks within battery particles are ubiquitously induced during cycling. Tracking the origin of nanocrack formation and its subsequent propagation remains challenging, although it is crucial for cycle life kinetics batteries. Moreover, even more challenging to understand how such nanocracks influence lithium (de)insertion pathways local strain fields particles. In this study, we utilized operando scanning transmission X-ray microscopy on individual LiFePO4 (LFP) visualize...
Abstract Ni‐rich layered oxides (NRLO) are widely considered among the most promising cathode materials for high energy‐density lithium ion batteries. However, proportion of Ni content accelerates cycling degradation that restricts their large‐scale applications. The origins indeed heterogeneous and thus there tremendous efforts devoted to understanding underlying mechanisms at multi‐length scales spanning atom/lattice, particle, porous electrode, solid‐electrolyte interface, cell levels...
Despite remarkable facileness and potential in forming a wide variety of heterostructured nanoparticles with extraordinary compositional structural complexity, one-pot synthesis multicomponent heterostructures is largely limited by the lack fundamental mechanistic understanding, designing principles, well-established, generally applicable chemical methods. Herein, we developed heterointerfacial metamorphosis (1HIM) method that allows heterointerfaces inside particle to undergo multiple...
Abstract Increasing lithium contents within the lattice of positive electrode materials is projected in pursuit high‐energy‐density batteries. However, it intensifies release oxygen and subsequent gas evolution during operations. This poses significant challenges for managing internal pressure batteries, particularly terms management composite electrodes—an area that remains largely unexplored. Conventional assumptions postulate total estimated by multiplying particle count quantities...
Lithium-Ion Batteries In article number 2402024, Jongwoo Lim and co-workers explore the fundamental causes of temperature surges during thermal runaway in lithium-ion battery full cells. The identifies intermediates that create a self-amplifying loop via multidirectional crosstalk between electrodes. cover image depicts this crosstalk, illustrating how ethylene gas from anode oxygen cathode trigger runaway.
Transition-metal-based solid-state electrocatalysts undergo dynamic phase transformation governed by the local electrochemical environment during operation, e.g., oxygen evolution/reduction( 1,2 ), hydrogen evolution( 3 and carbon dioxide reduction( 4 ). Electrochemical active species, often hidden before can become evolved due to applied potential and/or surrounding chemicals. These species are stabilized under dynamically generated reaction product, proton (H + ) or hydroxyl (OH - group(...
Understanding the diffusion dynamics of lithium within solid-state electrodes is pivotal for developing high-performance batteries. In this context, layered oxides were utilized as a promising cathode material due to their high energy density and fast intraparticle diffusivity. Despite advancements in composition, coating, doping, understanding has long been described by Fick's law. Conventionally, assumed generate monotonic concentration gradient solid-solution single-crystalline battery...
Degradation of electrode particles during cycling is chemo-mechanically coupled and needs to be systematically investigated for the Li-ion battery development. The effect Li transport pathway on internal stress crack formation remains elusive. opposite cracked, newly exposed active surface alteration, accelerating chemo-mechanical degradation, also poorly known. Using operando scanning transmission X-ray microscopy [100]-oriented LiFePO 4 single particles, we demonstrated that lithium...
Understanding the dynamics of lithium diffusion within solid-state electrodes is pivotal for advancing high-performance batteries. Conventionally, solid-solution battery particles has been assumed to be solely driven in direction minimizing concentration gradient, resulting a monotonous distribution. However, employing operando scanning transmission X-ray microscopy, this study revealed presence non-monotonous dense and dilute domains individual single-crystalline LiNi 1/3 Mn Co O 2 at...
Cathode Calcination In article number 2207076, Sugeun Jo, Keeyoung Jung, Jongwoo Lim, and co-workers show how solid-state reaction heterogeneity affects the high-temperature calcination of Li-ion battery particles. Various parallel serial combinations thermal (an)aerobic decomposition Li2–O insertion/diffusion are chemically imaged during reaction. The cover image features intermediates that facilitate surface incorporation, which is impeded by anaerobically decomposed phase in particle core.
LiFePO 4 (LFP), the attractive commercial cathode materials, exhibits phase separation between lithium-poor and lithium-rich within individual particles due to wide miscibility gap. The boundaries such phases develop large stress, lead cracks particles, decay cycle life. There have been lots of interest in investigating origin lithium heterogeneity manipulating during cycling. Previously, we revealed that insertion kinetics is dependent on local composition from which hysteresis...
The significantly reduced capacity at a fast cycling rate is one of the most serious bottlenecks that prevent large-scale application Ni-rich layered oxide cathode for electrical vehicle batteries. Figuring out decline mechanism crucial to addressing such hurdle and developing ultrafast lithium ion In this work, with operando synchrotron-based spectroscopy, we captured formation non-equilibrium separated phases during extremely various oxides, in contrast their solid-solution structural...