PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2023
·Vol. 25
·期 21
·14918-14927
·
IF 3.3
Wenming Qi,Hadiqa Abdugopur,Wei Xu,Min Gao,Anwar Hushur,Hongyan Zhang
As a typical layered oxide material, Li2TiO3 has attracted considerable attention in the energy revolution and military industries, owing to its lithium-rich and “zero-strain” characteristics. However, its phase-transition behavior under high pressure remains unclear. Herein, we report a second-order phase transition from the monoclinic phase to a higher-symmetry phase in nano-polycrystalline Li2TiO3 at 43 GPa by in situ high-pressure Raman experiments and first-principles calculations at 300 K. As validated by the experiments and calculations, the distortion of layered oxide-TiO6 in Li2TiO3 is crucial in the phase transition. By modulating the gap between octahedral-TiO6 layers, we propose a potential Li2TiO3 structural model for improving the electrochemical performance of lithium-ion batteries. Our findings suggest that, based on its high-pressure phase, Li2TiO3 is a promising candidate for layered cathode materials and solid tritium breeding materials for lithium-ion batteries.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF FUSION ENERGY
·
2025
·Vol. 44
·期 1
·1-14
·
IF 2.1
Hu Xin,Tan Guangfan,Cai Liang,Yi Biao,Xu Dajun,Gao Zeyu,Dong Xiaoxu,Li Yusha,Zhang Yingchun
In order to meet the huge demand for millimetre-sized Li 2 TiO 3 ceramic pebbles for future fusion reactors, the aim of this work was to develop a combination of microfluidic and UV curing techniques to greatly improve the preparation efficiency. By employing a cross-junction microfluidic device, large-sized droplets were controllably generated and subsequently subjected to in-situ UV curing, enabling rapid solidification of resin-based ceramic slurries. Systematic investigations revealed critical processing parameters: (1) The rheological behavior of ceramic slurries was governed by solid content and dispersant concentration, directly influencing droplet stability during microfluidic manipulation. (2) UV curing efficacy depended on exposure time(10 ~ 40 s), aging time (30 ~ 120 s) and solid content, and the optimised conditions allow complete cross-linking of 2 mm green pebbles. (3) Post-sintering at an ultra-low heating rate (0.5 °C/min) produced Li 2 TiO 3 ceramic pebbles with a relatively dense microstructure and high crush load(42 N).This microfluidic and UV curing strategy demonstrates potential process controllability and scalability.
研究领域:
材料科学
·
核能工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Qing Liu,Huifang Xing,Yunze Zhao,Qingfen Liu,Qiyu Meng,Huizhou Liu,Liangrong Yang
Titanium (Ti)-based lithium ion sieves (LISs) have advantages such as structural stability and environmental friendliness, making them promising for lithium extraction from salt lake brine. However, the adsorption kinetics and capacity of granulated Ti-based LISs are very limited, which restricts their industrial applications. Inspired by biomimetic channels for Li transport, herein, a Ti-based LISs membrane with fast kinetics and high adsorption capacity has been proposed. Firstly, a flower-shaped Li 2 TiO 3 (LTO) assembled by nanosheets with a superhydrophilic surface was prepared for the first time. Thereafter, the LTO was compounded into poly (oligo (ethylene glycol) methacrylate) (POEGMA) through UV-curing to obtain the PP@POEGMA/LTO membrane. Due to the lithiophilic properties of oligoethers in POEGMA, Li + ions could pass through the inner pathway preferentially and rapidly. Furthermore, the abundant hydroxyl functional groups in POEGMA enhanced the hydrophilicity of membrane, facilitating the mass transfer of ad/desorption. After 0.1 mol·L −1 HCl elution to obtain PP@POEGMA/HTO composite membrane, the adsorption equilibrium of membrane was found to achieve within 4 h, as fast as that of the powders HTO. Meanwhile, the equilibrium adsorption capacity reached 32.19 mg·g −1 . Dynamic adsorption experiments revealed that the composite membrane maintained a lithium removal rate of over 80 % within 30 min, with the adsorption capacity stabilizing at 20 mg·g −1 after five cycles. As for selective adsorption experiments in the Qarhan salt-lake brine and natural seawater, PP@POEGMA/HTO membrane showed a Li/Mg separation factor of 86.4 in spite of the Mg/Li as high as 249, and Li/Na separation factor of 14,508 in spite of the Na/Li as high as 60674, respectively. This work provides a straightforward approach for LISs membrane to achieving high-efficiency recovery, promoting their application in practical industries.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 105
·期 10
·6407-6416
·
IF 4.186
Hao Guo,Yanli Shi,Hailiang Wang,Ruichong Chen,Diyin Ye,Qiwu Shi,Jianqi Qi,Zhijun Liao,Tiecheng Lu
Li 2 TiO 3 has a broad stoichiometric range and wide application prospects such as cathode, tritium breeder, and microwave dielectric materials. Particularly, Li 2 TiO 3 shows a faster tritium release performance and exceptional chemical and radiation stabilities, making it one of the most promising solid breeder materials. Li-rich Li 2 TiO 3 has been developed for years as an advanced breeder material due to its enhanced tritium production and better stability in hydrogen atmosphere. However, the defect chemistry responsible for accommodating excess Li and how the non-stoichiometry improves the material's performance is still unclear. In this work, the crystal structure and non-stoichiometry-induced defects in Li-rich Li 2 TiO 3 were investigated by means of X-ray diffraction, electron spin resonance, and X-ray photoelectron spectroscopy. Results show that oxygen vacancies and cation disorder both play a major role in the incorporation of excess Li. The sintering atmosphere (air/vacuum) has a negligible effect on the formation of the non-stoichiometry-induced defects but will influence the concentration of the oxygen vacancies. The better stability in the reduction atmosphere may be ascribed to the oxygen vacancies inside the Li-rich Li 2 TiO 3 crystals.
研究领域:
材料科学
·
核能工程
·
固体化学
✓ 已验证
DOI
高影响因子
TRANSACTIONS OF TIANJIN UNIVERSITY
·
2022
·Vol. 29
·期 1
·46-61
·
IF 0
Shi Baozhao,Feng Jiangli,Liu Jing,Zhou Yanan,Zhang Jinli,Li Wei
A sol–gel tandem with a solid-phase modification procedure was developed to synthesize Li 2 TiO 3 -doped LiCoO 2 together with phosphate coatings (denoted as LCO-Ti/P), which possesses excellent high-voltage performance in the range of 3.0–4.6 V. The characterizations of X-ray diffraction, high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy illustrated that the modified sample LCO-Ti/P had the dopant of monoclinic Li 2 TiO 3 and amorphous Li 3 PO 4 coating layers. LCO-Ti/P has an initial discharge capacity of 211.6 mAh/g at 0.1 C and a retention of 85.7% after 100 cycles at 1 C and 25 ± 1 °C between 3.0 and 4.6 V. Nyquist plots reflect that the charge transfer resistance of LCO-Ti/P after 100 cycles at 1 C is much lower than that of the spent LCO, which benefits Li-ion diffusion. Density functional theory calculations disclose the superior lattice-matching property of major crystal planes for Li 2 TiO 3 and LiCoO 2 , the lower energy barriers for Li-ion diffusion in Li 2 TiO 3 , and the suppressed oxygen release performance resulting from phosphate adsorption. This work provides useful guidance on the rational design of the high-voltage performance of modified LiCoO 2 materials in terms of lattice-matching properties aside from the phosphate coating to reduce the energy barriers of Li-ion diffusion and enhance cycling stability.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Yuanming Lai,Caiyun Hong,Lichuan Jin,Xiaoli Tang,Huaiwu Zhang,Xin Huang,Jie Li,Hua Su
In this work, a series of low-temperature-firing (1− x )Mg 2 SiO 4 – x Li 2 TiO 3 –8 wt% LiF ( x = 35–85 wt%) microwave dielectric ceramics was prepared through conventional solid state reaction. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analyses showed that the Li 2 TiO 3 phase was transformed into cubic phase LiTiO 2 phase and secondary phase Li 2 TiSiO 5 . Partial substitution of Mg 2+ ions for Ti 3+ ions or Li + Ti 3+ ions increased the cell volume of the LiTiO 2 phase. The dense microstructures were obtained in low Li 2 TiO 3 content ( x ≤ 65 wt%) samples sintered at 900 °C, whereas the small quantity of pores presented in high Li 2 TiO 3 content ( x ≥ 75 wt%) samples sintered at 900 °C and low Li 2 TiO 3 content ( x = 45 wt%) sintered at 850 and 950 °C. Samples at x = 45 wt% under sintering at 900 °C for 4 h showed excellent microwave dielectric properties of ε r = 10.7, high Q × f = 237,400 GHz and near-zero τ f = − 3.0 ppm/°C. The ceramic also exhibited excellent chemical compatibility with Ag. Thus, the fabricated material could be a possible candidate for low temperature co-fired ceramic (LTCC) applications.
研究领域:
材料科学
·
电子材料
✓ 已验证
产品关联
DOI
高影响因子
Nuclear Materials and Energy
·
2022
·
IF 3.037
Yichao Gong,Yuefei Wang,Junjie Li,Fei Han,Mao Deng,Qingze Na,Yijiang Yang,Zhanwen Liu,Mingxiang Tang,Chao Dang,Guojun Zhang
For solid tritium breeding materials, a high sintering temperature is essential to achieve satisfactory density, high crushing load, favorable physical and chemical properties, while lithium volatilization and grain coarsening occur at higher sintering temperature, which are not conducive to tritium production and release. Therefore, low temperature sintering of lithium containing ceramics needs to be studied. In this work, P25 titanium dioxide was hydrothermally treated in alkaline solution, and then used as titanium source to prepare Li 2 TiO 3 ceramics. The prepared Li 2 TiO 3 ceramics exhibit uniform and dense microstructure and extremely high crushing load (a.v. 78.93 ∼ 83.98 N) at a relative low sintering temperature (750 ∼ 800 °C). The thermal conductivity of Li 2 TiO 3 ceramic sintered at 800 °C is calculated to be 3.48 W/m•K at room temperature, retaining 2.50 W/m•K at 773 K, which is comparable to the values in literatures. The results suggest the sintering activity of Li 2 TiO 3 is greatly enhanced when alkaline hydrothermally treated P25 is used as titanium source.
研究领域:
材料科学
·
核能工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NUCLEAR MATERIALS
·
2025
·
IF 3.2
Guangfan Tan,Qilai Zhou,Yasuhisa Oya,Yingchun Zhang,Chang-An Wang,Yanhao Dong
The Li 2 TiO 3 and Li 2 ZrO 3 ceramic pebbles are regarded as promising tritium breeder on account of their superb chemical stability, high tritium diffusion rates, and neutron multiplication potential of Zr, respectively. To integrate the advantages of these two materials, it is necessary to develop a composite such as Li 2 TiO 3 -Li 2 ZrO 3 , which is ideal for advanced fusion reactor designs. Up to now, fabricated biphasic ceramic pebbles generally suffer from low production yield, inadequate crushing load, and high cost, which restricts their application in practice. In this paper, biphasic Li 2 TiO 3 -Li 2 ZrO 3 tritium breeding pebbles with superior crushing strength are successfully fabricated employing the centrifugal granulation method by selecting the appropriate binder and controlling the growth rate. Moreover, by this technique, ceramic pebbles with wide diameter distribution can be obtained, which will help to improve the packing factor of pebble beds in the solid blanket. In addition, the composition, microstructure, and internal structure of the Li 2 TiO 3 -Li 2 ZrO 3 ceramic pebbles are thoroughly analyzed, respectively. The Li 2 TiO 3 -Li 2 ZrO 3 ceramic pebbles, after being sintered at 1100 °C, attained a high sphericity of 0.97, a superior crushing load of 67.6 N, and an optimum porosity of 9.75 % in the shell. Moreover, the Li 2 TiO 3 -Li 2 ZrO 3 ceramic pebbles also exhibit excellent deuterium release properties with the main form of HDO. The above results show that the centrifugal granulation method is not only applicable to the mass production of Li 2 TiO 3 -Li 2 ZrO 3 ceramic pebbles but also to other tritium breeders, which offers promising prospects for the development of advanced tritium breeding materials in the future.
研究领域:
材料科学
·
核工程
·
陶瓷学
·
聚变技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Guo Tian,Linzhao Ma,Qianbiao Du,Longxiang Jiang,Hongzhi Xiao,Hao Li
A novel type of Li 3 NbO 4 –Li 2 TiO 3 - x MgO (LLM x , x = 1–5) ceramics were prepared using the solid-state reaction method. When the sintering temperature is between 1180 °C and 1300 °C, the solid solution ceramics with cubic rock salt structure are obtained. As the MgO content increases, the ε r value decreases, the τ f value is basically constant, and Q×f exhibits ideal dielectric properties at x = 4 ( ε r = 15.26, Q×f = 119,456 GHz ( f = 9.97 GHz), τ f = −35.9 ppm/°C). The Raman spectrum analysis was used to examine and understand the vibration mode and intrinsic mechanism of dielectric properties in ceramics. Additionally, a dielectric resonant antenna based on LLM 4 ceramic is fabricated with a resonant frequency of 7.23 GHz (|S 11 | = −45.6 dB), a higher gain and broadband width of 501 MHz.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Crystals
·
2022
·Vol. 12
·期 4
·512
·
IF 2.67
Zhijian Wang,Feng Pan,Lanlan Liu,Qifeng Du,Ruitao Tang,Jun Ai,Hong Zhang,Ying Chen
Mg2SiO4holds promise for its application in the microwave communication field due to its low dielectric constant and highQ×fvalue. However, its high negativeτfand high sintering temperature limit its application in low-temperature co-fired ceramic (LTCC) devices. In this work, Li2TiO3and CaTiO3were introduced to improve theτf, and LiF was chosen to decrease the sintering temperature. According to XRD patterns and SEM micrographs, the ceramic systems displayed a complex-phase structure, and the microstructure was densified when CaTiO3was added. All of the relative densities, dielectric constants, andQ×fvalues first increased and then decreased as the sintering temperature increased. The MLLC11.5 ceramics sintered at 800 °C could be obtained with the highestQ×fvalue of 54,581 GHz (at 8.06 GHz),εrof 14.13, andτfof + 5.81 ppm/°C. Furthermore, it was proven that the MLLC11.5 powders could be co-fired without any reaction with Ag powders at 800 °C, indicating its potential for LTCC application. The MLLC11.5 composition was used to prepare a GPS antenna and showed good prospects for its application in electronic communications.Keywords:Mg2SiO4-Li2TiO3-LiF-CaTiO3ceramics;structure;microwave dielectric property;LTCC;antenna
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
IONICS
·
2019
·Vol. 25
·期 2
·399-410
·
IF 2.289
Jia Guofeng,Liu Suqin,Yang Guowei,Li Faqiang,Wu Kang,He Zhen,Shangguan Xuehui
To improve the cycle performance, z Li 2 TiO 3 @LiNi 0.5 Mn 0.5 O 2 ( z = 0, 1, 3 and 5 mol%) (“@” means “was coated on the surface of”) cathode materials have been successfully prepared via a syn-lithiation strategy. The high-resolution transmission electron microscope (HRTEM) structural analysis results show that Li 2 TiO 3 is evenly coated on the surface of LiNi 0.5 Mn 0.5 O 2 , with the thickness of the coating layer of approximately 10 nm. The electrochemical characterizations of the synthesized z Li 2 TiO 3 @LiNi 0.5 Mn 0.5 O 2 suggest that 1 mol% Li 2 TiO 3 @LiNi 0.5 Mn 0.5 O 2 electrode shows the best electrochemical performance, including the highest capacity and best cycle stability and rate performance. The capacity retention at 25 °C is improved by approximately 23% by the 1 mol% Li 2 TiO 3 coating. The improved cycling performance of LiNi 0.5 Mn 0.5 O 2 arises from the presence of the Li 2 TiO 3 surface layer, which suppresses the direct contact between the active materials and the electrolytes, enhances the lithium ion diffusion through the electrode/electrolyte interface, expands the BET area, stabilizes the structure and prevents the pulverization of the active materials during repeated charging/discharging. The XPS results showed that Li 2 TiO 3 coating layer could inhibit electrolyte decomposition, and the decomposition of electrolyte on the surface of coating electrode is different from that of LiNi 0.5 Mn 0.5 O 2 electrode.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yichao Gong,Jiarui Li,Lin Liu,Zhaokun Li,Longchao Zhuo,Guojun Zhang
Multiphase composites of lithium ceramics have emerged as a prominent area of research in the development of advanced solid tritium breeding materials. In this study, Li 2 TiO 3 /Li 2 SiO 3 co-doped Li 4 SiO 4 ceramic pebbles were prepared through an in-situ reaction between Li 4 SiO 4 and TiO 2 . The objective of this study is to enhance the thermal cycling stability of Li 4 SiO 4 by impeding the grain boundary migration of Li 4 SiO 4 under high temperature conditions. The effects of the in-situ generated Li 2 TiO 3 /Li 2 SiO 3 particles on the microstructure, crush load and thermal cycling stability of Li 4 SiO 4 ceramic pebbles were investigated. The in-situ formed Li 2 TiO 3 and Li 2 SiO 3 particles effectively hindered the grain growth and minimized the formation of large intracrystalline pores in Li 4 SiO 4 . At a sintering temperature of 900 °C, the Li 2 TiO 3 /Li 2 SiO 3 particles are beneficial in increasing the crush load of Li 4 SiO 4 ceramic. However, at lower sintering temperatures, their impact was counterproductive. An increase in the volume fractions of the Li 2 TiO 3 /Li 2 SiO 3 had a positive effect on grain refinement but a negative effect on crush load. The Li 2 TiO 3 /Li 2 SiO 3 co-doped Li 4 SiO 4 ceramic pebbles exhibited excellent structural stability during thermal cycling. The optimum mechanical stability was achieved at a TiO 2 addition of y = 0.1. The in-situ generated fine second phase particles effectively impeded grain boundary migration at high temperatures, providing a viable strategy for improving the thermal stability of Li 4 SiO 4 tritium breeders.
研究领域:
材料科学
·
核能工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）