Zhengrui Xu
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View article: DenoiseRep: Denoising Model for Representation Learning
DenoiseRep: Denoising Model for Representation Learning Open
The denoising model has been proven a powerful generative model but has little exploration of discriminative tasks. Representation learning is important in discriminative tasks, which is defined as "learning representations (or features) o…
View article: Cross-length-scale investigation reveals the spatial thermo-chemical dynamics hidden in Ni-rich layered Li-ion cathodes
Cross-length-scale investigation reveals the spatial thermo-chemical dynamics hidden in Ni-rich layered Li-ion cathodes Open
View article: Surface coating by mechanofusion modulates bulk charging pathways and battery performance of Ni-rich layered cathodes
Surface coating by mechanofusion modulates bulk charging pathways and battery performance of Ni-rich layered cathodes Open
Ni-rich layered oxides as high-capacity battery cathodes suffer from degradation at high voltages. We utilize a dry surface modification method, mechanofusion (MF), to achieve enhanced battery stability. The simplicity, high yield, and fle…
View article: Rigid registration algorithm based on the minimization of the total variation of the difference map
Rigid registration algorithm based on the minimization of the total variation of the difference map Open
Image registration is broadly used in various scenarios in which similar scenes in different images are to be aligned. However, image registration becomes challenging when the contrasts and backgrounds in the images are vastly different. T…
View article: Effect of the grain arrangements on the thermal stability of polycrystalline nickel-rich lithium-based battery cathodes
Effect of the grain arrangements on the thermal stability of polycrystalline nickel-rich lithium-based battery cathodes Open
One of the most challenging aspects of developing high-energy lithium-based batteries is the structural and (electro)chemical stability of Ni-rich active cathode materials at thermally-abused and prolonged cell cycling conditions. Here, we…
View article: Dynamics of particle network in composite battery cathodes
Dynamics of particle network in composite battery cathodes Open
Improving composite battery electrodes requires a delicate control of active materials and electrode formulation. The electrochemically active particles fulfill their role as energy exchange reservoirs through interacting with the surround…
View article: Detection results of NMC particles in composite battery cathodes
Detection results of NMC particles in composite battery cathodes Open
This dataset shows more examples of the NMC particles detection overlayed with the original images in composite battery cathodes. @journal{li2022networkevolution, title={Dynamics of particle network in composite battery cathodes}, author={…
View article: Detection results of NMC particles in composite battery cathodes
Detection results of NMC particles in composite battery cathodes Open
This dataset shows more examples of the NMC particles detection overlayed with the original images in composite battery cathodes. @journal{li2022networkevolution, title={Dynamics of particle network in composite battery cathodes}, author={…
View article: Investigating Particle Size‐Dependent Redox Kinetics and Charge Distribution in Disordered Rocksalt Cathodes
Investigating Particle Size‐Dependent Redox Kinetics and Charge Distribution in Disordered Rocksalt Cathodes Open
Understanding how various redox activities evolve and distribute in disordered rocksalt oxides (DRX) can advance insights into manipulating materials properties for achieving stable, high‐energy batteries. Herein, the authors present how t…
View article: Mapping Lattice Distortions in LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub> Cathode Materials
Mapping Lattice Distortions in LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub> Cathode Materials Open
Spinel LiNi0.5Mn1.5O4 (LNMO) can adopt two crystallographic structures: an ordered P4332 structure and a disordered Fd$\\bar 3$m structure. The disordered phase is associated with the reduction o…
View article: Revealing the Dynamics and Roles of Iron Incorporation in Nickel Hydroxide Water Oxidation Catalysts
Revealing the Dynamics and Roles of Iron Incorporation in Nickel Hydroxide Water Oxidation Catalysts Open
The surface of an electrocatalyst undergoes dynamic chemical and structural transformations under electrochemical operating conditions. There is a dynamic exchange of metal cations between the electrocatalyst and electrolyte. Understanding…
View article: Chemical Modulation of Local Transition Metal Environment Enables Reversible Oxygen Redox in Mn-Based Layered Cathodes
Chemical Modulation of Local Transition Metal Environment Enables Reversible Oxygen Redox in Mn-Based Layered Cathodes Open
Oxygen redox plays a prominent role in enhancing the energy density of Mn-based layered cathodes. However, understanding the factors affecting the reversibility of oxygen redox is nontrivial due to complicated structural and chemical trans…
View article: Chemical Modulation of Local Transition Metal Environment Enables Reversible Oxygen Redox in Mn-Based Layered Cathodes
Chemical Modulation of Local Transition Metal Environment Enables Reversible Oxygen Redox in Mn-Based Layered Cathodes Open
Oxygen redox plays a prominent role in enhancing the energy density of Mn-based layered cathodes. However, understanding the factors affecting the reversibility of oxygen redox is nontrivial due to the complicated concurrent structural and…
View article: Chemical Modulation of Local Transition Metal Environment Enables Reversible Oxygen Redox in Mn-Based Layered Cathodes
Chemical Modulation of Local Transition Metal Environment Enables Reversible Oxygen Redox in Mn-Based Layered Cathodes Open
Oxygen redox plays a prominent role in enhancing the energy density of Mn-based layered cathodes. However, understanding the factors affecting the reversibility of oxygen redox is nontrivial due to the complicated concurrent structural and…
View article: Reversible Mn/Cr dual redox in cation-disordered Li-excess cathode materials for stable lithium ion batteries
Reversible Mn/Cr dual redox in cation-disordered Li-excess cathode materials for stable lithium ion batteries Open
View article: Probing Dopant Redistribution, Phase Propagation, and Local Chemical Changes in the Synthesis of Layered Oxide Battery Cathodes
Probing Dopant Redistribution, Phase Propagation, and Local Chemical Changes in the Synthesis of Layered Oxide Battery Cathodes Open
Achieving the targeted control of layered oxide properties calls for more fundamental studies to mechanistically probe their evolution during their synthesis. Herein, dopant distribution, phase propagation, and local chemical changes as we…
View article: Defect and structural evolution under high-energy ion irradiation informs battery materials design for extreme environments
Defect and structural evolution under high-energy ion irradiation informs battery materials design for extreme environments Open
View article: Mutual modulation between surface chemistry and bulk microstructure within secondary particles of nickel-rich layered oxides
Mutual modulation between surface chemistry and bulk microstructure within secondary particles of nickel-rich layered oxides Open
View article: Phase segregation reversibility in mixed-metal hydroxide water oxidation catalysts
Phase segregation reversibility in mixed-metal hydroxide water oxidation catalysts Open
View article: Charging Reactions Promoted by Geometrically Necessary Dislocations in Battery Materials Revealed by In Situ Single‐Particle Synchrotron Measurements
Charging Reactions Promoted by Geometrically Necessary Dislocations in Battery Materials Revealed by In Situ Single‐Particle Synchrotron Measurements Open
Crystallographic defects exist in many redox active energy materials, e.g., battery and catalyst materials, which significantly alter their chemical properties for energy storage and conversion. However, there is lack of quantitative under…
View article: Tuning the Morphology and Electronic Properties of Single-Crystal LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4−δ</sub>: Exploring the Influence of LiCl–KCl Molten Salt Flux Composition and Synthesis Temperature
Tuning the Morphology and Electronic Properties of Single-Crystal LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4−δ</sub>: Exploring the Influence of LiCl–KCl Molten Salt Flux Composition and Synthesis Temperature Open
Single-crystal materials have played a unique role in the development of high-performance cathode materials for Li batteries due to their favorable chemomechanical stability. The molten salt synthesis method has become one of the most prom…
View article: A Surface Chemistry Approach to Tailoring the Hydrophilicity and Lithiophilicity of Carbon Films for Hosting High‐Performance Lithium Metal Anodes
A Surface Chemistry Approach to Tailoring the Hydrophilicity and Lithiophilicity of Carbon Films for Hosting High‐Performance Lithium Metal Anodes Open
Porous carbon scaffolds can host lithium (Li) metal anodes to potentially enable stable Li metal batteries. However, the poor Li metal wettability on the carbon surface has inhibited the uniform distribution of metallic Li on most carbon s…
View article: Quantitative probing of the fast particle motion during the solidification of battery electrodes
Quantitative probing of the fast particle motion during the solidification of battery electrodes Open
Synchrotron x-ray tomography represents one of the most powerful imaging techniques that can visualize the three-dimensional microstructural complexity with a high spatial resolution. To date, however, the temporal resolution of this techn…
View article: Charge distribution guided by grain crystallographic orientations in polycrystalline battery materials
Charge distribution guided by grain crystallographic orientations in polycrystalline battery materials Open
View article: The sensitive surface chemistry of Co-free, Ni-rich layered oxides: identifying experimental conditions that influence characterization results
The sensitive surface chemistry of Co-free, Ni-rich layered oxides: identifying experimental conditions that influence characterization results Open
Co-free, Ni-rich layered cathodes suffer from surface instability during various stages of the sample history, creating challenges for obtaining statistically representative characterization results and achieving stable battery performance.
View article: Targeted Surface Doping with Reversible Local Environment Improves Oxygen Stability at the Electrochemical Interfaces of Nickel-Rich Cathode Materials
Targeted Surface Doping with Reversible Local Environment Improves Oxygen Stability at the Electrochemical Interfaces of Nickel-Rich Cathode Materials Open
Elemental doping represents a prominent strategy to improve interfacial chemistry in battery materials. Manipulating the dopant spatial distribution and understanding the dynamic evolution of the dopants at the atomic scale can inform bett…
View article: Flexible lignin carbon membranes with surface ozonolysis to host lean lithium metal anodes for nickel-rich layered oxide batteries
Flexible lignin carbon membranes with surface ozonolysis to host lean lithium metal anodes for nickel-rich layered oxide batteries Open
View article: Quantification of Heterogeneous Degradation in Li‐Ion Batteries
Quantification of Heterogeneous Degradation in Li‐Ion Batteries Open
The multiscale chemomechanical interplay in lithium‐ion batteries builds up mechanical stress, provokes morphological breakdown, and leads to state of charge heterogeneity. Quantifying the interplay in complex composite electrodes with mul…
View article: Electrocatalysis: Well‐Dispersed Nickel‐ and Zinc‐Tailored Electronic Structure of a Transition Metal Oxide for Highly Active Alkaline Hydrogen Evolution Reaction (Adv. Mater. 16/2019)
Electrocatalysis: Well‐Dispersed Nickel‐ and Zinc‐Tailored Electronic Structure of a Transition Metal Oxide for Highly Active Alkaline Hydrogen Evolution Reaction (Adv. Mater. 16/2019) Open
Transition-metal oxides were previously considered inactive toward hydrogen evolution. In article 1807771, Tao Ling, Shi-Zhang Qiao, and co-workers demonstrate that tailored control of an oxide via dual-elemental doping can turn it into a …
View article: High‐Voltage Charging‐Induced Strain, Heterogeneity, and Micro‐Cracks in Secondary Particles of a Nickel‐Rich Layered Cathode Material
High‐Voltage Charging‐Induced Strain, Heterogeneity, and Micro‐Cracks in Secondary Particles of a Nickel‐Rich Layered Cathode Material Open
Nickel‐rich layered materials LiNi 1‐x‐y Mn x Co y O 2 are promising candidates for high‐energy‐density lithium‐ion battery cathodes. Unfortunately, they suffer from capacity fading upon cycling, especially with high‐voltage charging. It i…