JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Kui Liu,Liang Shi,Xueying Wang,Cheng Liu,Jie Li,Yulong Liao,Lichuan Jin,Dainan Zhang,Huaiwu Zhang
Herein, Li + -enriched Li (1+ x )2 ZnTi 3 O 8 ceramics are prepared via the solid-phase methods. As x increases, the unit cell volume gradually increases, while the grain size initially increases and then decreases gradually. The Li (1+0.06)2 ZnTi 3 O 8 ceramics exhibit the best dielectric properties : ε r = 25.92, Q × f = 109534 GHz (@7.37 GHz, which is a 48 % increase compared with the stoichiometric counterpart.), and τ f = −8.21 ppm/°C. The complex chemical bond theory and Raman spectroscopy reveal that Ti-O bonds have a significant effect on the dielectric properties . An optimal Li + enrichment leads to an overall reduction in the distortion of the Li/ZnO 4 tetrahedra, resulting in a reduction in τ f . First-principles calculations demonstrate that a suitable excess of Li + leads to an increase in the band-gap as well as an enhanced electron cloud density in the internal space of the Li1/ZnO 4 tetrahedra, thereby increasing the Q × f . In summary, Li + -enriched Li (1+0.06)2 ZnTi 3 O 8 ceramics are promising for a wide array of applications in microwave communications.
研究领域:
材料科学
·
固态物理
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2021
·Vol. 9
·期 19
·2100337
·
IF 9.926
Dan Zhang,Xiangting Zhang,Baofeng Zheng,Qi Sun,Zhibo Zheng,Zhan Shi,Yanhua Song,Haifeng Zou
A series of Eu 2+ single doped Ca 9 Na 1– x Li x Sc 0.667 (PO 4 ) 7 phosphors with full-spectrum emission have been synthesized. Under the 385 nm excitation, the Eu 2+ single doped Ca 9 NaSc 0.667 (PO 4 ) 7 without Li + doping displays a broad cold white light emission with the peaks at about 480 and 610 nm. With the introduction of Li + ions, the Eu 2+ ions selectively occupy the Ca1, Ca2/Ca3, and Na sites. The variation of local environment of Eu 2+ ions caused by Li + ions enhances the luminous intensity, solves the problem of the lack of a red light component, and realizes the emission color tuning from cold white via warm white to orange. A special charge compensation method caused by Li + migration avoids the generation of defects and is beneficial to the improvement of luminescence properties. Eventually, a warm white light-emitting diode device is prepared by combining the white emitting Ca 9 Na 0.8 Li 0.2 Sc 0.667 (PO 4 ) 7 :2%Eu 2+ phosphors with 385 nm LED chip, which exhibits a high color-rendering of 92.9, low correlated color temperatures of 4529 K, and excellent color stability under working temperature. The as-reported warm white emitting Eu 2+ -doped phosphors have potential applications in full-spectrum solid-state lighting. The site engineering strategy provides an extensive guide for optimizing and designing novel single-composition white-emitting phosphor materials.
研究领域:
材料科学
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光学工程
·
固态照明
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Fei Zhao,Yixin Guo,Xiang Wang,Jiahua Tao,Zeng Li,Dongliang Zheng,Jinchun Jiang,Zhigao Hu,Junhao Chu
Facile electron injection and extraction are two important attributes desired in electron transportation layer (ETL) to improve the power conversion efficiency (PCE) of planar CsPbBr 3 perovskite solar cell (PSC). Here, it is demonstrated that Li-doping of amorphous compact Nb 2 O 5 (Li: Nb 2 O 5 ) can effectively increase the electronic conductivity and facilitate the charge extraction with low recombination. Comparing with the PSC with Nb 2 O 5 ETL, the PCE of the Li: Nb 2 O 5 -based PSC is enhanced from 5.79% to 7.06%. Furthermore, the Li: Nb 2 O 5 -based CsPbBr 3 PSC exhibits a fabulous stability when exposed in air with moisture of ∼40% for 60 days. This work shows that ion doping provides new opportunities for preparing effective ETLs and high-performance inorganic PSCs .
研究领域:
材料科学
·
能源科学
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产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 43
·15433-15442
·
IF 4.174
Yini Mao,Zhiyi Wang,Rui Ye,Li Jiang,Shanshan Hu,Jun Yang
Octahedral [CaY]F2 crystals with an average particle size of 1 μm were synthesized via a mild one-step hydrothermal route without employing any surfactants. Various morphologies, including cubes, truncated cubes, truncated octahedrons, and spheres, were achieved via manipulating the amount of EDTA used, and a possible growth mechanism was proposed based on the surface energies of different crystal planes and the influence of the surfactant. XRD, SEM, EDS, TEM, HRTEM, and PL analysis were used to characterize the products. The effects of the morphologies and Li+ doping concentrations on the luminescence intensities of the [CaY]F2:Ce3+/Tb3+ phosphors were explored, and the strongest luminescence intensity is obtained when the sample is cubic with (100) crystal faces and the doping concentration of Li+ is 0.25 mol%. Additionally, multicolor emission (blue → aquamarine blue → green) was obtained from [CaY]F2:Ce3+/Tb3+ phosphors via adjusting the doping concentration of Tb3+, which resulted from the Ce3+ → Tb3+ energy transfer behavior; the energy transfer here happened through a dipole–dipole mechanism. This work may result in the as-synthesized phosphors having great application potential in many optoelectronic device fields, such as in displays and multicolor lighting.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Quan Li,Yahui Liu,Yanghe Liu,Yanhong Ji,Zhenyu Cui,Feng Yan,Jianxin Li,Mohammad Younas,Benqiao He
An electric field assisted nanofiltration (ENF) process was used for Mg 2+ /Li + efficient separation from a MgCl 2 /LiCl solution and a simulated salt-lake brine. The influence of membrane pore structure , electric property, and other process parameters on the Mg 2+ /Li + separation performance in the ENF was systematically investigated. The structural coefficient ( λ ) of NF membrane was introduced to quantify the membrane pore structure including pore size, pore length and porosity. Results suggested that membrane pore structure, instead of membrane pore size, had a critical role on the ENF separation performance. Direct current electric field (DC-EF) markedly promoted Mg 2+ /Li + separation. However, the effect of alternating current EF (AC-EF) with different frequencies was nominal. The synergistic effect between λ and DC-EF on Mg 2+ /Li + separation was also demonstrated. A low-concentration feed with suitable Mg 2+ /Li + mass ratio and pH value, and low transmembrane pressure were beneficial to Mg 2+ /Li + separation. For 2000 ppm MgCl 2 /LiCl feed solution with a Mg 2+ /Li + mass ratio of 20, a nearly complete rejection to Mg 2+ and a high Li + flux simultaneously achieved; correspondingly, a separation factor of Li + over Mg 2+ ( S Li,Mg ) reached above 7000, which is 2-3 orders of magnitude higher than that of pure NF membrane. For a simulated 10,000 ppm brine solution, a S Li,Mg value was up to above 50. The study suggested that ENF process witnessed simple and efficient separation performance for Li + extraction from salt lakes.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Honglin Yan,Yuan Ha,Tao Ye,Xiaoya Gao,Xiangting Yue,Zhimin Li
Ni-rich LiNi x Mn 1- x O 2 cathodes have been extensively probed to resolve the electrochemical performance degradation in the absence of Co 3+ compared to LiNi x Co y Mn 1- x - y O 2 cathodes for lithium-ion batteries. Herein, LiNi 0.6 Mn 0.4 O 2 (NM64) and a series of nonmagnetic Al 3+ ions substituted NM64 cathode materials are designed and prepared via a sol–gel route. It is found that the inferior electrochemical performance of NM64 derives from the magnetic frustration arising from Mn ions and the unstable Mn 3+ ions, which will lead to severe Li/Ni mixing, and weak structural and interfacial stabilities of the cathode. The superconducting quantum interference device (SQUID) analysis proves that the nonmagnetic Al 3+ ion can lower the Li/Ni disorder in NM64 cathode by relieving magnetic frustration. Moreover, the dQ/dV and XPS analyses confirm that both structural and interfacial stabilities are enhanced for NM64 cathode owing to Al 3+ substitution, contributing to fewer byproducts after a long cycle. Consequently, LiNi 0.582 Mn 0.388 Al 0.03 O 2 cathode delivers a high discharging capacity of 179 mAh g −1 at 1.0C with a capacity retention of 87.6% after 100 cycles. This study not only gives an in-depth understanding of the mechanism of electrochemical performance degradation for NM64 cathode, but also demonstrates an efficient solving approach through Al 3+ complementary substitution.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Yunhao Li,Shuhao Wang,Wenyuan Wu,Haijun Yu,Ruxin Che,Guodong Kang,Yiming Cao
Nanofiltration is considered a promising technology for separation of multivalent/monovalent ions such as extracting lithium from Salt Lake brine with high Mg 2+ /Li + ratio. However, the nanofiltration membranes fabricated via conventional interfacial polymerization process generally possess negatively charged surface and have low Mg 2+ /Li + selectivity. Herein, we proposed a new and facile method, i.e., reversed interfacial polymerization (RIP), to prepare nanofiltration membranes with positively charged surface and uniform charge distribution. The sequence of amine (polyethyleneimine, PEI) and acyl chloride (trimesoyl chloride, TMC) monomers on polysulfone support was reversed compared to the conventional interfacial polymerization (IP) process. Moreover, the solvent of amine monomer was acetone instead of water. The nanofiltration membranes fabricated by this method exhibited higher water flux (from 4.88 to 22.25 Lm −2 h −1 ) and MgCl 2 rejection (from 84.36% to 97.71%). Meanwhile, LiCl/MgCl 2 separation factor in single salt solution reached up to 13.93, which was almost quadruple compared to the conventional control membrane. In addition, the developed nanofiltration membrane also exhibited an excellent separation selectivity ( S Li, Mg = 9.22) in mixture system (Mg 2+ /Li + mass ratio of 20), which had good application potential in extracting lithium resources from Salt Lake brine.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2023
·Vol. 52
·期 11
·7184-7192
·
IF 2.1
Yang Shengyan,Chang Niannian,Han Mengyuan,Zhang Yang
Pb-free piezoelectric ceramic materials (K 0.48 Na 0.48 Li 0.04 )(Nb 0.92 Ta 0.08− x Sb x )O 3 (KNLNTS) were designed and prepared. The effects of varied Sb/Ta doping on the physical structure, surface morphology, and electrical characteristics of ceramics were also studied. The perovskite structure is present in all of the doped ceramic samples without any secondary phase (when x < 0.05). All of the doped ceramic samples have a Curie temperature ( T C ) above 300°C. At the same time, the orthorhombic–tetragonal phase transition temperature ( T O–T ) is pushed closer to ambient temperature. Doping with Sb/Ta/Li changed the electrical characteristics of the samples and increased their piezoelectric properties. At x = 0.03, the KNLNTS sample has the best piezoelectric properties: d 33 = 215 pC/N, Pr = 26.08 μC/cm 2 , T C = 342.6°C.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Junqing Chang,Mati Horprathum,Dianhui Wang,Gang Meng,Zanhong Deng,Bin Tong,Pinit Kidkhunthod,Tiantian Dai,Meng Li,Hongyu Liu,Wei Tong,Shimao Wang,Xiaodong Fang
Though p-type NiO possesses excellent catalytic oxidation property toward volatile organic compounds (VOCs), intrinsic low sensitivity of NiO (arising from the hole accumulation layer configuration in ambient air atmosphere sensor) restricts its promising applications in VOCs detection. In this study, Sc and Li were proposed to modulate the (surface) properties of NiO nanosheet-flowers based sensors. At the optimal 2 at.% Sc and 5 at.% Li doping ratio (Ni 0.93 Sc 0.02 Li 0.05 O), the sensitivity to 100 ppm ethanol is 118.4 (105 times higher than that of pure NiO), which is comparable to or even higher than most of reported NiO based sensors. Moreover, Ni 0.93 Sc 0.02 Li 0.05 O sensor exhibits a low detection limit of 10 ppb, excellent repeatability and long-term stability (∼30 % decline of response after 7 months). Apart from regulating the carrier concentration, defect characterizations indicate a noticeable increase of stabilized surface oxygen vacancy (O V ) defects and Ni 3+ cations by Sc 3+ and Li + co-doping, which greatly facilitate the adsorption of VOCs molecule (revealed by density functional theory calculation) as well as the subsequent VOCs/NiO interfacial charge interaction, thus contribute to the superior sensing performances. This work demonstrates that co-doping offers an effective avenue for boosting the performances of (p-type) oxide sensors.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Fangfang Zou,Xue Xia,Xiaojia Zheng,Xu Su,Wei Guan,Xueqiang Qi,Meng Wang,Lian Wang,Xuebu Hu
The application of Li metal anode in high energy density batteries is hindered by uncontrolled dendrites growth and rapid capacity decline. In this study, 4-aminobenzoic acid (4-ABA) is used as a multifunctional electrolyte additive to effectively stabilise Li anode and extend the cycling life of LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA) cathode in carbonate electrolyte. It is found that 4-ABA facilitates the desolvation of Li + and increases the Li + transference number, leading to an increase in Li + flux on the surface of the Li anode, and finally the growth of Li dendrites is inhibited. The cycling performance of Li||Li symmetric cell is extended from < 400 h to more than 600 h at 1 mA cm −2 with a capacity of 1 mAh cm −2 . For the NCA cathode, 4-ABA is involved in the formation of a thin and uniform cathode electrolyte interphase (CEI) layer, which is conducive to inhibiting the corrosion of electrolyte on NCA cathode and reducing the dissolution of the transition metals Ni and Co. Thus, the electrochemical performances of the Li||NCA cell with the electrolyte containing 0.5% 4-ABA are significantly improved. In particular, the discharge capacity of the cells with the electrolyte containing 0.5% 4-ABA are still 164.9 and 150.7 mAh g −1 compared to only 126.3 and 116.0 mAh/g for the cells with the baseline electrolyte after 200 cycles at 1C and 5C. This study provides a simple and effective strategy for improving the electrochemical performances of Li anodes and NCA cathodes by optimising the electrolyte.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-12
·
IF 14.7
Chen Qian,Gao Binyin,Yang Zhilin,Li Yong,Zhai QingWei,Jia Yangyu,Zhang Qiannan,Gu Xiaokang,Zuo Jinghan,Wang Lei,Wang Tianshuai,Zhai Pengbo,Yang Cheng,Gong Yongji
The numerous grainboundaries solid electrolyte interface, whether naturally occurring or artificially designed, leads to non-uniform Li metal deposition and consequently results in poor full-battery performance. Herein, a lithium-ion selective transport layer is reported to achieve a highly efficient and dendrite-free lithium metal anode. The layer-by-layer assembled protonated carbon nitride nanosheets present uniform macroscopical structure without grainboundaries. The carbon nitride with ordered pores in basal plane provides high-speed lithium-ion transport channels with low tortuosity. Consequently, the assembled 324 Wh kg −1 pouch cell exhibits 300 stable cycles with a capacity retention of 90.0% and an average Coulombic efficiency up to 99.7%. The ultra-dense Li metal anode makes current collector-free anode possible, achieving high energy density and long cycle life of a 7 Ah cell (506 Wh kg −1 , 160 cycles). Thus, it is proved that a macroscopically uniform interface layer with lithium-ion conductive channels could achieve Li metal battery with promising application potential.
研究领域:
材料科学
·
电化学
·
电池技术
·
纳米技术
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Chenxi Tian,Da Lei,Yongchao Qian,Xiang-Yu Kong,Zhong Liu
The development of advanced membranes with precise ion selectivity is essential for efficient Li + /Mg 2+ separation. In this study, we synthesized a novel Lys-TMC membrane via a nucleophilic addition reaction between Lysine and trimesoyl chloride (TMC), yielding in a negatively charged surface interconnected by amide bonds. We systematically investigated the effects of varying Lys:TMC ratios on the membrane’s chemical structure, surface morphology, and ion separation performance. Our results revealed that the degree of cross-linking increases initially with the Lysine content, reaching an optimum at a Lys:TMC ratio of 10:1, where the membrane exhibited prominent Turing patterns on its surface. These patterns were critical for achieving effective ion separation. In contrast, excessive Lysine led to spontaneous polymerization, resulting in irregular ‘stone-like’ structures and the loss of Turing patterns. The optimally cross-linked Lys-TMC membrane displayed superior Li + /Mg 2+ separation performance, highlighting the crucial role of controlled cross-linking and Turing structure formation in enhancing ion selectivity. This work provides a mechanistic understanding of the relationship between Turing structure formation and ion sieving performance, offering a promising strategy for designing advanced separation membranes.
研究领域:
材料科学
·
化学工程
·
膜技术
·
离子分离
✓ 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）