2025-05-19
Derrick Shieh
This study aims to develop a single-cell prototype of a bulk All-Solid-State Electrolyte Lithium-Ion Battery (ASSELIB) using the Multi-layer Co-fired Ceramic (MLCC) method. The primary active materials selected for this experiment are as follows: (a) Solid-state electrolyte material: lithium aluminum titanium phosphate with a NaSICON structure, Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP), (b) Cathode material: lithium nickel cobalt manganese oxide, LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811); (c) Anode material: a mixture of lithium titanium oxide with a spinel structure, Li 4 Ti 5 O 12 (LTO), and titanium dioxide with a rutile structure, TiO 2 , (R-TiO 2 ). In the experiment, the powders of these three components were sequentially layered into a specific mold, forming three distinct layers: cathode, electrolyte, and anode. The electrolyte layer was placed between the cathode and anode layers to ensure effective separation and prevent direct contact. The layered powder was then subjected to high pressure, creating a solid laminated bulk structure. This structure was co-fired in a high-temperature furnace at five different temperatures (600, 650, 700, 750, and 800°C) to produce the ASSELIB single cell. The experiment successfully fabricated an all-solid-state electrolyte lithium-ion single cell by utilizing the physical sintering principles of the MLCC method. At high temperatures, the solid components were connected to form a well-connected interface that allows lithium ions to migrate smoothly across the electrolyte, moving between the cathode and anode. The battery’s physical properties, density changes, and electrochemical characteristics were evaluated, including the formation quality of solid interfaces between each layer, ensuring no chemical interaction between components. Future work will focus on optimizing the cell by adjusting experimental parameters for enhanced performance.
2025-05-19
Magdalena Gromada
Lead-free piezoelectric materials for applications in power engineering, electronics and medicine are still of industrial interest. This paper presents the functional parameter optimization of a promising material, barium-calcium titanate (BCT), which reveals piezoelectric properties. The most crucial properties of the BCT powder, i.e., phase composition, morphology, pore size distribution, porosity and particle size distribution, were characterized. The forming process, including both uniaxial and isostatic pressing, was developed. Material sintering was optimized to obtain a high level of compaction while ensuring the smallest grain sizes in the material. The parameters of the sintered materials, i.e., densification stage, bending strength, hardness, fracture toughness, and microstructure, are presented. The material developed in this work possesses functional properties that allow successful replacement of the commonly used PZT containing environmentally unfriendly lead.
2025-05-19
HUYRA ESTEVAO DE ARAUJO
Dense ceramics based on yttrium-doped barium cerate (BaCe₀.₉Y₀.₁O₃-δ) were prepared using two powder processing routes: the conventional solid-state reaction and a modified wet chemical method. Various sintering schedules were applied to investigate densification mechanisms and microstructural evolution. Results indicate that liquid phase sintering (LPS) occurs in both routes, with a more significant effect in low-sinterability powders from solid-state reactions. Electrical conductivity measurements revealed that ceramics prepared via the wet chemical route exhibited superior proton conductivity at lower sintering temperatures, demonstrating reduced dependence on sintering schedules. This study highlights the role of LPS in optimizing the microstructure and electrical properties of barium cerate ceramics.
2025-05-19
Tiantian Liu
High-temperature lead-free piezoelectric ceramics of Bi 4 Ti 2.95 W 0.05 O 12 - x wt% CeO 2 （- x wt%, where x =0,0.02,0.03,0.05）entional solid-state method. The effects of modulating the degree of ceramic lattice distortion by varying the amount of Ce 4+ doping on the microscopic morphology as well as the piezoelectric and dielectric properties of the ceramics were investigated. The results showed that the appropriate amount of Ce 4+ doping has led to an appropriate degree of lattice distortion within the piezoelectric ceramics, thereby improving piezoelectric and dielectric properties and reduced dielectric losses of ceramics. Notably, when the doping level x reached 0.03, the sample exhibited its optimal performance, specifically with a d 33 of 24 Pc/N, T c of 608℃, tanδ of 0.09%, and Q m of 3364. These results strongly suggest that this material possesses significant potential for applications in the high-level sensing domain.