A5054608774- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Supercapacitor Materials and Fabrication
- Advanced Battery Technologies Research
- Extraction and Separation Processes
- Graphene research and applications
- Advanced battery technologies research
- Machine Learning in Materials Science
- X-ray Diffraction in Crystallography
- Transition Metal Oxide Nanomaterials
- Ferroelectric and Piezoelectric Materials
- Semiconductor materials and devices
- Chemical Synthesis and Characterization
- Electronic and Structural Properties of Oxides
- Catalytic Processes in Materials Science
- Crystallization and Solubility Studies
- Inorganic Chemistry and Materials
- Advancements in Solid Oxide Fuel Cells
- Electron and X-Ray Spectroscopy Techniques
- Conducting polymers and applications
- Electrocatalysts for Energy Conversion
- Solid-state spectroscopy and crystallography
- Magnetic Properties and Synthesis of Ferrites
- Catalysis and Oxidation Reactions
- Computational Drug Discovery Methods
Lawrence Berkeley National Laboratory
2016-2025
Cyclotron (Netherlands)
2023-2024
Sandia National Laboratories
2024
Seoul National University
2012-2022
Berkeley College
2020-2021
University of California, Berkeley
2020
Pusan National University
2013-2019
Institute for Basic Science
2013-2016
Government of the Republic of Korea
2015-2016
Institute of Applied Mechanics
2016
LiNi x Co y Mn z O 2 (NCM, 0 ≤ , < 1) has become one of the most important cathode materials for next‐generation lithium (Li) ion batteries due to its high capacity and cost effectiveness compared with LiCoO . However, high‐voltage operation NCM (>4.3 V) required is inevitably accompanied by a more rapid fade over numerous cycles. Here, degradation mechanisms 0.5 0.2 0.3 are investigated during cycling under various cutoff voltage conditions. The surface lattice structures observed...
Grid‐scale energy storage systems (ESSs) that can connect to sustainable resources have received great attention in an effort satisfy ever‐growing demands. Although recent advances Li‐ion battery (LIB) technology increased the density a level applicable grid‐scale ESSs, high cost of Li and transition metals led search for lower‐cost system alternatives. Based on abundance accessibility Na its similar electrochemistry well‐established LIB technology, Na‐ion batteries (NIBs) attracted...
This work reports that natural graphite is capable of Na insertion and extraction with a remarkable reversibility using ether‐based electrolytes. Natural (the most well‐known anode material for Li–ion batteries) has been barely studied as suitable rechargeable batteries due to the lack intercalation capability. Herein, not only but also exhibits outstanding performance an ion batteries. The delivers reversible capacity ≈150 mAh g −1 cycle stability 2500 cycles, more than 75 at 10 A despite...
Abstract The development of rechargeable batteries using K ions as charge carriers has recently attracted considerable attention in the search for cost‐effective and large‐scale energy storage systems. In light this trend, various materials positive negative electrodes are proposed evaluated application K‐ion batteries. Here, a comprehensive review ongoing research on nonaqueous is offered. Information status new discovery insights to help understand K‐storage mechanisms provided. addition,...
Abstract A hybrid supercapacitor with high energy and power densities is reported. It comprises a composite anode of anatase TiO 2 reduced graphene oxide an activated carbon cathode in non‐aqueous electrolyte. While intercalation compounds can provide typically at the expense power, nanoparticles are able to sustain both supercapacitor. At voltage range from 1.0 3.0 V, 42 W h kg −1 achieved 800 . Even 4‐s charge/discharge rate, density as 8.9 be retained. The this bridges gap between...
The lithium-oxygen battery has the potential to deliver extremely high energy densities; however, practical use of Li-O2 batteries been restricted because their poor cyclability and low efficiency. In this work, we report a novel with reversibility good efficiency using soluble catalyst combined hierarchical nanoporous air electrode. Through porous three-dimensional network electrode, not only lithium ions oxygen but also catalysts can be rapidly transported, enabling ultra-efficient...
Hybrid supercapacitors (battery-supercapacitor hybrid devices, HSCs) deliver high energy within seconds (excellent rate capability) with stable cyclability. One of the key limitations in developing high-performance HSCs is imbalance power capability between sluggish Faradaic lithium-intercalation anode and rapid non-Faradaic capacitive cathode. To solve this problem, we synthesize Nb2O5@carbon core-shell nanocyrstals (Nb2O5@C NCs) as high-power materials controlled crystalline phases...
The solvated-Na-ion intercalation in graphite is investigated terms of stoichiometry, staging structure, and solvated ion configuration using combined experimental theoretical studies.
Large-scale electric energy storage is a key enabler for the use of renewable energy. Recently, room-temperature Na-ion battery has been rehighlighted as an alternative low-cost technology this application. However, significant challenges such density and long-term stability must be addressed. Herein, we introduce novel cathode material, Na1.5VPO4.8F0.7, batteries. This new material provides ∼600 Wh kg–1, highest value among cathodes, originating from both multielectron redox reaction (1.2...
Recently, hybrid supercapacitors (HSCs), which combine the use of battery and supercapacitor, have been extensively studied in order to satisfy increasing demands for large energy density high power capability energy-storage devices. For this purpose, requirement anode materials that provide enhanced charge storage sites (high capacity) accommodate fast transport rate capability) has increased. Herein, therefore, a preparation nanocomposite as material is presented an advanced HSC using it...
Sodium‐ion hybrid supercapacitors (Na‐HSCs) have potential for mid‐ to large‐scale energy storage applications because of their high energy/power densities, long cycle life, and the low cost sodium. However, one obstacles developing Na‐HSCs is imbalance kinetics from different charge mechanisms between sluggish faradaic anode rapid non‐faradaic capacitive cathode. Thus, develop high‐power Na‐HSC materials, this paper presents facile synthesis nanocomposites comprising Nb 2 O 5 @Carbon...
Flexible lithium ion batteries (LIBs) have received considerable attention as a key component to enable future flexible electronic devices. A number of designs for LIBs been reported in recent years; this article, we review progress. We focus on how flexibility can be introduced into each the LIB, including active materials, electrolytes, separators, and current collectors. Approaches integrating single device are described corresponding changes electrochemical mechanical properties...
Novel and low‐cost batteries are of considerable interest for application in large‐scale energy storage systems, which the cost per cycle becomes critical. Here, this study proposes K 0.5 MnO 2 as a potential cathode material K‐ion an alternative to Li technology. has P3‐type layered structure delivers reversible specific capacity ≈100 mAh g −1 with good retention. In situ X‐ray diffraction analysis reveals that undergoes phase transition upon extraction insertion. addition, first‐principles...
The high capacity of the layered Li–excess oxide cathode is always accompanied by extraction a significant amount oxygen from structure. effects on electrochemical cycling are not well understood. Here, detailed reaction scheme following evolution was established using real-time gas analysis and ex situ chemical surface electrodes. A series electrochemical/chemical reactions involving radicals constantly produced decomposed lithium carbonate during cell operation. Moreover, byproducts,...
To close the gap between rates of computational screening and experimental realization novel materials1,2, we introduce A-Lab, an autonomous laboratory for solid-state synthesis inorganic powders. This platform uses computations, historical data from literature, machine learning (ML) active to plan interpret outcomes experiments performed using robotics. Over 17 days continuous operation, A-Lab realized 41 compounds a set 58 targets including variety oxides phosphates that were identified...
Compounds with a mixed polyanion framework have recently gained attention as new class of compounds for material exploration. The potential tunability the structure by using various combinations polyanions can potentially lead to novel cathode. However, redox reaction in complex structures often involves structural evolutions during electrochemical reaction, which require careful analysis. We investigated mechanism NaxFe3(PO4)2(P2O7) (1 ≤ x 4), was proposed promising mixed-polyanion cathode...
K‐ion batteries are a potentially exciting and new energy storage technology that can combine high specific energy, cycle life, good power capability, all while using abundant potassium resources. The discovery of novel cathodes is critical step toward realizing (KIBs). In this work, layered P2‐type K 0.6 CoO 2 cathode developed highly reversible ion intercalation demonstrated. situ X‐ray diffraction combined with electrochemical titration reveals store release considerable amount ions via...
Graphite is the most widely used anode material for Li‐ion batteries and also considered a promising K‐ion batteries. However, Na + , similar alkali ion to Li or K incapable of being intercalated into graphite thus, not potential electrode Na‐ion This atypical behavior has drawn considerable attention; however, clear explanation its origin yet been provided. Herein, through systematic investigation metal intercalation compounds (AM‐GICs, AM = Li, Na, K, Rb, Cs) in various solvent...
Herein, we propose an advanced energy-storage system: all-graphene-battery. It operates based on fast surface-reactions in both electrodes, thus delivering a remarkably high power density of 6,450 W kg−1total electrode while also retaining energy 225 Wh electrode, which is comparable to that conventional lithium ion battery. The performance and operating mechanism all-graphene-battery resemble those supercapacitors batteries, thereby blurring the distinction between batteries. This work...
A nanohybridization strategy is presented for the fabrication of high performance lithium ion batteries based on redox-active organic molecules. The rearrangement electroactive aromatic molecules from bulk crystalline particles into molecular layers achieved by non-covalent active with conductive scaffolds. As a result, nano-hybrid electrodes in form flexible self-standing paper-free binder/additive and current collector-are synthesized, which exhibit energy power densities combined...