A5024177529- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Advanced Battery Technologies Research
- Supercapacitor Materials and Fabrication
- Semiconductor materials and devices
- Ferroelectric and Piezoelectric Materials
- Transition Metal Oxide Nanomaterials
- Advanced Memory and Neural Computing
- Electrochemical Analysis and Applications
- Dielectric properties of ceramics
- Extraction and Separation Processes
- Advanced battery technologies research
- Iron oxide chemistry and applications
- Fuel Cells and Related Materials
- Multiferroics and related materials
- Personal Information Management and User Behavior
- Electrocatalysts for Energy Conversion
- Conducting polymers and applications
- Electrochemical sensors and biosensors
- Semiconductor materials and interfaces
- Catalytic Processes in Materials Science
- Machine Learning in Materials Science
- Scientific Computing and Data Management
- Electron and X-Ray Spectroscopy Techniques
- Electronic and Structural Properties of Oxides
Stanford University
2015-2024
Materials Science & Engineering
2024
SLAC National Accelerator Laboratory
2023
Lawrence Berkeley National Laboratory
2018-2019
Lithium-rich layered transition metal oxide positive electrodes offer access to anion redox at high potentials, thereby promising energy densities for lithium-ion batteries. However, is also associated with several unfavorable electrochemical properties, such as open-circuit voltage hysteresis. Here we reveal that in Li
Ex situ transmission X-ray microscopy reveals micrometer-scale state-of-charge heterogeneity in solid-solution Li1−xNi1/3Co1/3Mn1/3O2 secondary particles even after extensive relaxation. The generates overcharged domains at the cutoff voltage, which may accelerate capacity fading and increase impedance with extended cycling. It is proposed that optimized structures can minimize by mitigating buildup of nonuniform internal stresses associated volume changes during charge. As a service to our...
High-resolution X-ray microscopy is used to investigate the sequence of lithiation in LiFePO4 porous electrodes. For electrodes with homogeneous interparticle electronic connectivity via carbon black network, smaller particles lithiate first. heterogeneous connectivity, better-connected preferentially lithiate. Correlative electron and also reveal presence incoherent nanodomains that as if they are separate particles.
LiFePO 4 is a promising phase‐separating battery electrode and model system for studying lithiation. The role of particle synthesis the corresponding morphology on nanoscale insertion migration Li not well understood, elucidating intercalation pathway crucial toward improving performance. A synchrotron operando liquid X‐ray imaging platform developed to track in electrodes with single‐particle sensitivity. Lithiation tracked two types—ellipsoidal platelet—while particles cycle an organic...
Realizing reversible reduction-oxidation (redox) reactions of lattice oxygen in batteries is a promising way to improve the energy and power density. However, conventional absorption spectroscopy fails distinguish critical chemistry oxide-based battery electrodes. Therefore, high-efficiency full-range mapping resonant inelastic X-ray scattering (mRIXS) has been developed as reliable probe redox reactions. Here, based on mRIXS results collected from series Li1.17Ni0.21Co0.08Mn0.54O2...
Stabilizing high-valent redox couples and exotic electronic states necessitate an understanding of the stabilization mechanism. In oxides, whether they are being considered for energy storage or computing, highly oxidized oxide-anion species rehybridize to form short covalent bonds related significant local structural distortions. intercalation oxide electrodes batteries, while such reorganization partially stabilizes oxygen redox, it also gives rise substantial hysteresis. this work, we...
Battery evaluation and early prediction software package (BEEP) provides an open-source Python-based framework for the management processing of high-throughput battery cycling data-streams. BEEPs features include file-system based organization raw data metadata received from cell testing equipment, validation protocols that ensure integrity such data, parsing structuring into Python-objects ready analytics, featurization structured to serve as input machine-learning, end-to-end examples use...
To reliably deploy lithium-ion batteries, a fundamental understanding of cycling and aging behavior is critical. Battery aging, however, consists complex highly coupled phenomena, making it challenging to develop holistic interpretation. In this work, we generate diverse battery dataset with broad range degradation trajectories, consisting 363 high energy density commercial Li(Ni,Co,Al)O$_2$/Graphite + SiO$_x$ cylindrical 21700 cells cycled under 218 unique protocols. We consolidate via 16...
To reliably deploy lithium-ion batteries, a fundamental understanding of cycling and aging behavior is critical. Battery aging, however, consists complex highly coupled phenomena, making it challenging to develop holistic interpretation. In this work, we generate diverse battery dataset with broad range degradation trajectories, consisting 363 high energy density commercial Li(Ni,Co,Al)O$_2$/Graphite + SiO$_x$ cylindrical 21700 cells cycled under 218 unique protocols. We consolidate via 16...
Iron is the most abundant transition metal in Earth’s crust, and redox cycling between its well-known low-valent oxidation states of FeII FeIII drives crucial processes nature. The FeII/III couple charge compensates lithium iron phosphate, a positive electrode (cathode) for lithium-ion batteries. High-valent couples, involving formal higher than FeIII, could deliver electrochemical potentials energy densities. However, because instability high-valent Fe electrodes, they have proven difficult...
Li- and Mn-rich (LMR) layered oxide positive-electrode materials exhibit high energy density have earth-abundant compositions relative to conventional Ni-, Mn-, Co-oxides (NMCs). The lithiation of coprecipitated precursors is a key part the synthesis offers opportunities for tuning properties LMR materials. Whereas morphology transition metal has received substantial attention, that Li sources not. Using Li1.14Mn0.57Ni0.29O2 as model system, in this work, we establish detailed understanding...
On page 6591, W. Chueh and co-workers use high-resolution X-ray microscopy to study the sequence of lithiation in LiFePO4 battery electrodes reveal that local electronic connectivity limits rate capability. For with homogeneous interparticle via carbon black network, smaller particles lithiate first. heterogeneous connectivity, better-connected preferentially lithiate.
The overwhelming majority of layered oxide cathode materials are based on the redox activity expensive and scarce transition metals like Co Ni. While Fe-redox material LiFePO 4 has become increasingly attractive due to its low cost, gravimetric energy density relatively operating voltage limit use cases. A high-voltage Fe-based would provide high utilizing redox-activity most abundant metal in Earth’s crust, but such a that provides stable reversible electrochemical performance remains...
Virtually all layered oxide positive electrodes (cathodes) for lithium-ion batteries exhibit abrupt shrinkage along the c lattice (c-collapse) at high states-of-charge, limiting cycle life. In this work, we suppress c-collapse by electrochemically inducing partial disorder permanently throughout bulk of compositionally-simple LiNi0.9Mn0.1O2. Our approach leverages irreversible oxygen oxidation in as-synthesized Li-excess Ni-rich oxides to activate disordering cation sublattice, while...
<title>Abstract</title> Virtually all layered oxide positive electrodes (cathodes) for lithium-ion batteries exhibit abrupt shrinkage along the <bold>c</bold> lattice (<bold>c</bold>-collapse) at high states-of-charge, limiting cycle life. In this work, we suppress <bold>c</bold>-collapse by electrochemically inducing partial disorder permanently throughout bulk of compositionally-simple LiNi<sub>0.9</sub>Mn<sub>0.1</sub>O<sub>2</sub>. Our approach leverages irreversible oxygen oxidation in...
Li- and Mn-rich (LMR) layered oxide positive electrode materials exhibit high energy density have earth abundant compositions relative to conventional Ni-, Mn-, Co-oxides (NMCs). The lithiation of coprecipitated precursors is a key part synthesis offers opportunities for tuning the properties LMR materials. Whereas morphology transition metal has received substantial attention, that Li sources not. Using Li1.14Mn0.57Ni0.29O2 as model system, in this work we establish detailed understanding...