A5093405509- Advancements in Battery Materials
- Advanced Battery Technologies Research
- Advanced Battery Materials and Technologies
- Aluminum Alloys Composites Properties
- X-ray Diffraction in Crystallography
- Thin-Film Transistor Technologies
- Semiconductor materials and interfaces
- Semiconductor materials and devices
- Advanced Surface Polishing Techniques
- MXene and MAX Phase Materials
- Aluminum Alloy Microstructure Properties
- Graphene research and applications
- Crystallization and Solubility Studies
- Silicon Nanostructures and Photoluminescence
Dalhousie University
2023-2024
To improve the energy density of LiFePO4 (LFP) cathode materials for Li-ion cells, we have utilized a modified mechanofusion method preparing micrometer-sized LFP/C composite flake particles. The resulting particle morphology resulted in improved packing efficiency, enabling an electrode porosity 14% to be achieved at high loadings, which represents volumetric increase 28% compared conventional LFP. Furthermore, composites electrodes were found higher coulombic reduced voltage–polarization,...
The transformation of crystalline silicon to amorphous during ball milling was quantitatively measured by x-ray diffraction and electrochemical methods. Amorphous found form rapidly from the very initial stages milling. Simultaneously, grain size phase decreased. Under extended times it that a maximum 86 % became amorphous. Similarly, could not be reduced below 6 nm. This followed an Avrami kinetic model, which is consistent with system reaches steady state. These observations suggest...
Abstract In this study, citric acid (CA) dissolved in propylene glycol (PG) was shown to be an effective binder/solvent system for Si-based anode materials Li-ion batteries. system, PG serves both as a slurry solvent and provides viscosity the inhibit settling of active particles proper rheology during coating process, while small CA molecule binder/artificial solid electrolyte interphase. After 50 cycles, SiO/carbon black/CA electrodes had higher capacity retention (93%) than conventional...
Silicon-graphite composite anode materials for Li-ion cells were synthesized by embedding nano-Si into voids within natural graphite mechanofusion, followed carbon coating chemical vapor deposition. In the resulting structure, completely filled with silicon nanoparticles encapsulated in carbon. This resulted being protected from reaction electrolyte. The as-prepared silicon-graphite composites shown to cycle well electrodes no special binders (PVDF) and conventional electrolytes without any...
Reduced surface area Si-Ti alloy anode materials for Li-ion batteries were prepared by ball milling. Using a high Ti content of 40 atomic % results in low (23 m 2 /ml) alloy, but also (∼100 mAh g −1 ) capacity. It was found that utilizing two-step milling method and controlling the time, Si (Si 0.85 0.15 with an amorphous active phase capacity (1600 could be synthesized has reduced (34 compared to same made conventional methods (41 /ml). When utilized as anodes lithium cells, showed initial...
Si-based anode materials have been widely studied due to their higher volumetric capacity compared graphite. 1 However, they can suffer from poor cycling severe volume changes, crystallization effects (formation of Li 15 Si 4 ), an unstable solid electrolyte interphase (SEI) and surface erosion. Alloying with electrochemically inactive material decrease the expansion lead better performance. If nanostructured or amorphous alloys are used, phase transition effect is suppressed. 1,2...