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High-performance Batteries for Electric Vehicles
VinFast Energy
Battery cell research & development
Build pilot line & mass production of 21700 cell, prismatic and pouch cell for both conventional & solid state cell.
• EV cell development (pouch cell & cylindrical cell, chemistry integration, cell design, manufacturing and technical support for customer OEMs);
• Develop low cost EV solution platform (from material, cell, battery and pack levels to find out solutions of cost down; an EV market without incentives)
• Develop high energy-density cathode project (210mAh/g). Develop high capacity anode.
• Join cathode material development, analyze the structure-property relation of cathode materials; Investigate the cathode-electrolyte interface properties, particularly their impact on the degradation of the cathode materials and the irreversible battery capacity loss.
Tohoku University
ALCA-SPRING Project
The increasing demand for higher energy density devices for future applications as in hybrid electric vehicles (HEV) or electric vehicles (EV) and portable electronics (laptops, smartphones) is challenging that request to development of novel energy storage systems beyond Li-ion technology. The spinel oxide, metal layer oxides, metal phosphates and metal silicates are attractive electrode materials for secondary battery thank to its superior specific capacity (300 mA h g−1) and high energy density (500 Wh kg−1). We investigate on atomic structure of these materials spinel oxide, layer oxide , metal silicate, olivine phosphate as well as silicon materials using spherical aberration-corrected scanning transmission electron microscopy (STEM) and their electrochemical reaction on the electrode and investigation of processes at the surfaces/interfaces using electrochemical methods coupled with ex situ and in situ X-ray-based and electron-based spectroscopy. These experimental components are used in conjunction with Density Functional Theory computation efforts to develop new, chemically based reaction mechanisms and design principles for superior batteries.
JSPS Project- Cathode materials for energy storage
The development of energy storage systems is critical to address the problems of climate change, shortage of fossils fuels, and also plays a key role for development of the renewable energy. Metal-ion batteries offer promising opportunities for novel energy storage systems and future application in as hybrid electric vehicles (HEV) or electric vehicles (EV). To realize the application of rechargeable Metal-ion batteries suitable for large scale, the main challenges, namely energy densities and power densities, have to be optimized. We develop novel nanostructured materials to address critical performance parameters related to energy storage including energy density, power density, safety, cycle and calendar life and cost. There are many candidates for electrode materials with high energy density, such as LiNiCoMnO2, LiMn2O4, LiFePO4, LiCoPO4, Li2CoPO4F, LiNiPO4, Li2CoSiO4, MoS etc... We investigate on atom-by-atom structure of these material using STEM to elucidate the charge-discharged behaviors.
MEXT Project for PhD Program-Solar Fuel Production
The development of alternative and renewable energy source has gained increasing attention at global level. Solar energy conversion into stored chemical offers intriguing opportunities to harvest green abundant energy for projected demands. Because hydrogen is one of most promising alternative carbon-free fuels, the transformation of solar energy into hydrogen storage represents enormous promise of achieving solar fuels. Furthermore, the consumption of fossil fuel resources and global warming caused by a surge of CO2 concentration in the atmosphere have triggered intensive research in innovative water splliting and reduction of CO2 to fuel. The photocatalytic hydrogen evolution and reducing CO2 to hydrocarbon fuels and/or valuable chemicals by solar energy is attracting great interest. However, this promising prospect is limited by the low quantum efficiency and selectivity of photocatalytic materials. The research has developed novel catalysis by band-gap engineering and nanostructured engineering for enhanced efficiency for both reactions.
http://www.nature.com/nmat/journal/v15/n6/full/nmat4588.html
Defect Chemistry in Energy Materials by ABF/HAADF-STEM
We study Materials Physics and Defects Chemistry for Energy Storage and Conversion Materials. Atomic-resolution imaging of the crystal defects of cathode materials is crucial to understand their formation and the correlation between the structure, electrical properties, and electrode performance in rechargeable batteries. Intrinsic structural defects, including point defects, edges, boundaries, stacking faults significantly affect the physical and chemical properties of energy materials, such as spinel, olivine or TMDs. Analyzing the exact sites of atoms and the chemistry of defects in nanocrystals would advance our understanding on their formation and properties. We provide investigation on intrinsic defects of energy materials, by means of atomic-resolved annular dark-field imaging. The atomic-scale imaging allows clarification that the physical chemistry of defects and their correlation with functional performance in batteries.
http://onlinelibrary.wiley.com/doi/10.1002/chem.201403691/abstract
Nanotechnology
When the size of materials is reduced to the nanoscale dimension, physical and chemical properties can change dramatically. In addition, nanostructures also afford new exciting opportunities of discovering novel properties. We are interested in a broad range of nanoscale properties including electronic, photonic, electrochemical, catalytic and interfacial properties. Understanding these properties has important technological implications in energy conversion and storage, electronics, biotechnology and environmental technology. We study fundamentals of nanomaterials including nanoclusters, colloidal nanocrystals and patterned nanostructures, develop novel processing and address their application for energy and environmental science.
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