A5037524750- Advancements in Battery Materials
- Advanced Battery Technologies Research
- Advanced Battery Materials and Technologies
- Electron and X-Ray Spectroscopy Techniques
- Magnetic Properties and Synthesis of Ferrites
- Semiconductor materials and devices
- Semiconductor materials and interfaces
- ZnO doping and properties
- Ferroelectric and Piezoelectric Materials
- Advanced X-ray Imaging Techniques
- Electrical and Thermal Properties of Materials
- Transition Metal Oxide Nanomaterials
- Extraction and Separation Processes
- Conducting polymers and applications
- Advanced materials and composites
- Supercapacitor Materials and Fabrication
- Advanced ceramic materials synthesis
- Advanced Electron Microscopy Techniques and Applications
European Synchrotron Radiation Facility
2022-2025
Aalto University
2024
Helsinki Institute of Physics
2024
University of Helsinki
2024
Cycling and post-mortem analysis of Li batteries • Comprehensive electrodes from fresh cycle aged
Next‐generation Li‐ion batteries are expected to exhibit superior energy and power density, along with extended cycle life. Ni‐rich high‐capacity layered nickel manganese cobalt oxide electrode materials (NMC) hold promise in achieving these objectives, despite facing challenges such as capacity fade due various degradation modes. Crack formation within NMC‐based cathode secondary particles, leading parasitic reactions the of inactive crystal structures, is a critical mechanism. Mechanical...
Abstract The nanoscale mechanisms of ion deintercalation in battery cathode materials remain poorly understood, especially the relationship between crystallographic defects (dislocations, small angle grain boundaries, vacancies, etc ), device performance, and durability. In this work, operando scanning X‐ray diffraction microscopy (SXDM) multi‐crystal (MCXD) are used to investigate microstrain lattice tilt inhomogeneities inside Li 1 − x Ni 0.5 Mn 1.5 O 4 particles during electrochemical...
Understanding the phase transition mechanisms of active materials inside Li-ion batteries is critical for rechargeability and optimizing power/energy density devices. In this work, high-energy microfocused X-ray diffraction used to measure in operando state-of-charge heterogeneities a high-voltage spinel (LiMn1.5Ni0.5O4, LMNO) cathode. The structure an material which resists complete delithiation studied move toward unlocking full storage capacity ion-conductive spinels. High-precision also...
The composition of lithium-ion battery positive electrodes, incorporating an active material, conductive carbon additives, and a binder, fundamentally influences the electrode physical electrochemical characteristics. In this study, properties electrodes with high amount material (LiNi0.6Mn0.2Co0.2O2 98 wt-%), were tested different ratios nanotubes (CNTs) black (CB) along varying amounts PVDF binder. Consequently, rate capability improves increase CNTs up to 30 wt-% in total share increasing...
Ni-rich layered oxides LiNi1-x-yMnxCoyO2 (NMC811, x = 0.1 and y 0.1) are considered promising cathode materials in lithium-ion batteries (LiBs) due to their high energy density. However, those suffer a severe capacity loss upon cycling at delithiated states. The of performance over time can be retarded by Zr doping. Herein, small amount is added NMC811 material via two alternative pathways: during the formation transition metal (TM) hydroxide precursor co-precipitation step (0.1%-Zr-cp)...
The widespread use of high-capacity Ni-rich layered oxides such as LiNi
The necessity of mapping crystal defects in battery materials after synthesis is crucial understanding heterogeneity within a single domain and among particles to develop superior quality materials. Numerous imaging techniques have been developed over the past years study these at nanoscale. However, most them use electron beams which demand many hours sample preparation, they are incompatible with investigation batteries under realistic working conditions. Techniques such as Scanning X-ray...
Understanding the phase transition mechanisms of active materials inside Li-ion batteries is critical for rechargability and optimizing power/energy density devices. In this work, high-energy microfocused X-ray diffraction used to measure in operando state-of-charge heterogeneities a high-voltage spinel (LiMn1.5Ni0.5O4, LMNO) cathode. The structure material which resists complete delithiation studied, towards unlocking full storage capacity ion-conductive spinels. High-precision also reveals...
The core principles and nanoscale mechanisms of ion deintercalation in battery cathode materials remain poorly understood, particular, the relationship between crystallographic defects (dislocations, small angle grain boundaries, vacancies, etc.) microscopic features Li deintercalation. Here, we used operando scanning X-ray diffraction microscopy (SXDM) to investigate local strain lattice tilt inhomogeneities inside Li1−xMn1.5Ni0.5O4 crystals (diameter from 1 2 µm) during electrochemical...
LiNi0.8Mn0.1Co0.1O2 (NMC811) is one of the most promising cathode materials for high energy density Li‐ion batteries (LiBs). However, NMC811 suffers from capacity fading during electrochemical cycling because its structure instability at voltages > 4.2 V vs Li|Li+ due to known hexagonal H2 → H3 phase transition. Zr doping has proven be effective in enhancing performances NMC811. In depth investigations are conducted through operando x‐ray diffraction (XRD) and ex‐situ absorption...