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Multifunctional Solvent Molecule Realizing High-Performance Elastic Polymer Electrolytes for Lithium Metal Batteries
(2025-11-26)
Nipatwarakan, Pimchanok
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Song, Junlin
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Cui, Yujie
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Guo, Decai
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Song, Yongyi
Solid-state polyurethane electrolytes offer excellent elasticity, which can significantly improve the interfacial ion transport of solid-state lithium metal batteries. However, pure polyurethane electrolytes suffer from poor Li+ conductivity. Herein, a multifunctional solvent molecule, trifluoro-N,N-dimethylacetamide (TFDMA), is introduced to modify the thermoplastic polyurethane (TPU) electrolyte, resulting in a composite electrolyte (TPU-TFDMA) with both high mechanical properties and good Li+ transport performance (ionic conductivity = 1.53 × 10–3 S cm–1 and Li+ transference number = 0.50). Experimental characterizations and theoretical simulations reveal that the presence of additional hydrogen-bonding interactions between TFDMA and the TPU chains not only maintains the mechanical strength of TPU but also enhances interfacial stability and effectively inhibits lithium dendrite growth. Furthermore, TFDMA promotes lithium salt dissociation and reduces the coordination between solvent molecules and Li+, facilitating Li+ desolvation and rapid diffusion. TFDMA also immobilizes TFSI–, thereby enhancing Li+ transport efficiency and contributing to the formation of stable and multifunctional interfaces between electrodes and electrolytes. Consequently, the TPU-TFDMA electrolytes enable the Li symmetric cell to stably work for over 2500 h and endow the LiFePO<inf>4</inf> full cell with a reversible capacity of 130 mAh g–1 after 320 cycles at 0.5 C.
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Mg Alloy Rod Strengthened by Combined Processes of Deformation-Restricted Forging and Extrusion
(2024-01-01)
Miura, H.
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Oba, Y.
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Watanabe, C.
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Benjanarasuth, T.
A new method for strengthening Mg alloy rod is proposed. AZ80Mg alloy rods were forged along the longitudinal axis (LA) at extremely high pressures beyond fracture stress under a condition where plastic deformation was eliminated in a die, i.e., deformation-restricted forging (DRFing), followed by cold extrusion. Although the ultimate tensile strength (UTS) and hardness were gradually raised with DRFing stress, the yield strength (YS) was lowered by sharp basal texture evolution on the plane normal to the LA and tensile axis. However, the extrusion after DRFing drastically changed the texture to (0001) LA, causing a large increase in YS. Consequently, a superior balance of mechanical properties: YS of 376 MPa, UTS of 417 MPa, and ductility of 10%, could be achieved after the combined processes of DRFing and extrusion.
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Determining the Annealing Temperature Dependency of Wetting and Mechanical Features on Fe3Si Films
(2023-08-01)
Borwornpornmetee, Nattakorn
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Achirawongwat, Chawapon
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Traiprom, Thawichai
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Saekow, Bunpot
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Porntheeraphat, Supanit
The impact of thermal annealing under temperature alteration on the wetting and mechanical attributes of Fe<inf>3</inf>Si films built through facing target sputtering (FTS) is an essential topic for study in order to identify their characteristics under varying temperatures. Consequently, we introduced a thermal annealing process in a vacuum for two hours under varying temperatures of 300, 600, and 900 °C to our Fe<inf>3</inf>Si films created via FTS. The primary purpose of this current research is to examine the effect of the thermal annealing technique under temperature alteration on the wetting and mechanical traits of Fe<inf>3</inf>Si films. In this research, Fe<inf>3</inf>Si films were built onto the Si wafer by FTS and divided for use in thermal annealing under temperature alteration. The structural, morphological, wetting, and mechanical traits of the Fe<inf>3</inf>Si films under thermal annealing are provided in the present work. Based on our information, this work represents an original study on the change in wetting and mechanical traits of Fe<inf>3</inf>Si films through thermal annealing under temperature alteration.
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Influence of various nanofillers on mechanical and electrical properties of epoxy resin composites
(2022-01-01)
Kitichatpayak, D.
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Makcharoen, W.
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Vittayakorn, N.
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Vittayakorn, Wanwilai
Epoxy-based composites are widely used in the aircraft, automobile, and microelectronic industries. The incorporation of various nanofillers into epoxy resins can yield high-performance composites having high strength, lightweight, and multifunctional properties. So, this work focuses on the preparation of various inorganic nanoparticles including the waste glass powder received from the broken windowpane filled in an epoxy resin matrix to create high-performance composites. The physical, chemical, mechanical, and electrical properties were investigated for all samples. The results show that the neat epoxy resin shows the lowest HV value and loses the most weight in the abrasion test. Whereas ZnO/epoxy resin composite shows the highest H<inf>V</inf>, the Al<inf>2</inf>O<inf>3</inf>/epoxy resin composite loses less weight in the abrasion test. For electrical results, the resistivity of epoxy resin composites filled with 2 wt% of Al<inf>2</inf>O<inf>3</inf> shows the highest value which is about 45% increase from the pure epoxy resin. Finally, it can be concluded that all inorganic fillers which are SiO<inf>2</inf>, Al<inf>2</inf>O<inf>3</inf>, TiO<inf>2</inf>, and ZnO including waste glass powder can really improve the hardness, abrasion resistance, and electrical resistivity of the epoxy resin.

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