Synthesis of 3D-structured Li4Ti5O12 from titanium(IV) oxysulfate (TiOSO4) solution as a highly sustainable anode material for lithium-ion batteries
摘要:
Because of its excellent safety and sustainability, spinel-structured lithium titanate (LTO, Li4Ti5O12) has recently attracted intensive attention as a promising anode material for lithium-ion batteries (LIBs) for large-scale applications. However, several obstacles impede the use of LTO in practical applications, including its high cost and relatively low capacity due to poor electron conductivity. To reduce the synthesis cost and increase the efficiency of LTO, LTO microspheres assembled with nanoparticles were prepared from a titanium(IV) oxysulfate (TiOSO4) solution, which is generally produced during the sulfate process in titanium mining of ilmenite (FeTiO3). Before LTO microspheres were synthesized, 1-2 mm microsphere scaffolds consisting of TiO2 nanoparticles were prepared through the urea-based hydrolysis of TiOSO4. The LTO microspheres were obtained through a sequential hydrothermal reaction-calcination process using LiOH and the as-prepared TiO2 microsphere scaffolds. According to the synthesis conditions, LTO-TiO2 (LTO-500), nonporous LTO (LTO-800), and porous LTO (LTO-HT3-500) microspheres were synthesized. The electrochemical performances of the synthesized LTO microspheres were most strongly affected by the microspheres' crystal size and surface area. The presence of TiO2 in the LTO microspheres also affected their performance. The LTO-HT3-500 microspheres (pure spinel LTO phase) showed an excellent initial discharge capacity of 158.7 mAh/g, superior cyclic ability (<7.3% capacity decay, 100 cycles at 1C), and rate capability (capacity loss 11%) at high current rates (0.1C-10C) because of their small crystal size (17.6 nm) and large specific surface area (44.4 m(2)/g). These results demonstrate that high-performance LTO microspheres for LIBs can be produced from TiOSO4 solution as a low-cost Ti source. (C) 2020 Elsevier B.V. All rights reserved.
Insoluble metal salts of N-acetyl-tryptophane and use thereof
申请人:Cooperation Pharmaceutique Francaise
公开号:US04215136A1
公开(公告)日:1980-07-29
The invention concerns: novel insoluble derivatives of N-acetyl-tryptophane characterized by the following general formula: ##STR1## in which: M represents an atom of aluminium, of titanium or of bismuth of valency m, p and q are whole numbers, at least equal to 1, r is a whole number at least equal to 1 or 0, with m.times.q=p+r, n is 0 or a whole or fractional number their preparation and medicaments containing them.
Low-temperature synthesis and adsorption property of rutile TiO<sub>2</sub> nanoparticles with mesoporous structure
作者:Shao-Qiang Hu、Guan-Feng Li、Xin-Hong Chang、Lu-Fang Ma
DOI:10.1080/15533174.2016.1186046
日期:2017.3.4
product was characterized. The prepared TiO2nanoparticles are of rutile crystal form (XRD) with an average particle size of 5.0 nm (TEM), a specific surface area of 368 m2/g (Brunauer-Emmett-Teller), and an average pore size of 4.2 nm (Barrett-Joyner-Halenda). Their adsorption property for cationic dye methylene blue was studied systematically. The adsorption kinetics is close to the pseudo-second
以硫酸钛为钛源,采用简单的低温沉淀法,无需煅烧即可制备出具有介孔结构的金红石型纳米TiO 2,并对其进行了表征。制备的TiO 2纳米颗粒为金红石型(XRD),平均粒径为5.0 nm(TEM),比表面积为368 m 2 / g(Brunauer-Emmett-Teller),平均孔径为4.2 nm(Barrett-Joyner-Halenda)。系统地研究了它们对阳离子染料亚甲基蓝的吸附性能。吸附动力学接近伪二级动力学模型,吸附等温线接近Redlich-Peterson等温线。
Droplet-oriented construction of porous metal oxide hollow microspheres and their assembly into superstructures
作者:Peihan Zhu、Peng Tian、Tingting Gao、Hongchang Pang、Junwei Ye、Guiling Ning
DOI:10.1039/d0nj02222e
日期:——
voids and highly porous structures have demonstrated desirable effectiveness in numerous areas. However, the traditional template methods for their synthesis are limited due to their sophisticated operations, expensive templates and low yield. Herein, with the aim to establish an efficient route for the scalable and low-cost production of hollow materials under mild conditions, we report a facile and versatile
具有内部空间或空隙以及高度多孔结构的中空多孔材料已在许多领域显示出理想的有效性。然而,由于其复杂的操作,昂贵的模板和低产率,用于其合成的传统模板方法受到限制。在本文中,为了建立在温和条件下可扩展且低成本生产空心材料的有效途径,我们报告了一种简便且通用的无模板策略,以制备具有高比表面积,大孔的空心多孔金属氧化物球大量和毛孔丰富。所制备的NiO微球显示出显着的表面积351 m 2 g -1和大孔体积0.55 mL g -1。该制剂的特征是基于喷雾技术和湿化学方法。此外,我们演示了这些空心上部结构的构造路径和可能的形成机理。探索了中空微球壳厚度的调节。此外,还设计和研究了一系列分层体系结构和多组分空心材料(例如MgO / Al 2 O 3)。
Novel 1.5 V anode materials, ATiOPO<sub>4</sub>(A = NH<sub>4</sub>, K, Na), for room-temperature sodium-ion batteries
Due to the abundance of sodium in nature, sodium-ion batteries (SIBs) have attracted widespread attention.
由于自然界中钠的丰富,钠离子电池(SIBs)引起了广泛关注。
Rapid synthesis of a TiO2 hollow microsphere assembly from hollow nanoparticles with enhanced photocatalytic activity
作者:Jinghua Cai、Zhouyou Wang、Kangle Lv、Yang Zheng、Jiaguo Yu、Mei Li
DOI:10.1039/c3ra42497a
日期:——
A novel hierarchical anatase TiO2 hollow microsphere (TiO2-HMS) assembly synthesised from TiO2 hollownanoparticles (TiO2-HNP), denoted TiO2-HMS-HNP, was rapidly fabricated by a simple hydrothermal route in a Ti(SO4)2–NH4F–H2O2 mixed solution at 180 °C for only 3 h. The influence of NH4F and H2O2 on the formation of TiO2-HMS-HNP was studied. A novel mechanism for the formation of TiO2-HMS-HNP based