Nanoscale Research Letters
·
2017
·Vol. 12
·期 1
·1-7
·
IF 2.833
Zhai Haifa,Liu Hairui,Li Hongjing,Zheng Liuyang,Hu Chunjie,Wang Zhao,Qi Jingjing,Yang Jien
The effects of Li/Nb ratio on the preparation of Li-Nb-O compounds by a hydrothermal method were studied deeply. Li/Nb ratio has a great impact on the formation of LiNbO 3 ; the ratio smaller than 3:1 is beneficial to the formation of LiNbO 3 , while larger than 3:1, forms no LiNbO 3 at all and the morphology and chemical bond of Nb 2 O 5 raw material are totally modified by Li ions. The reason can be attributed to the large content of LiOH, which is beneficial to form Li 3 NbO 4 not LiNbO 3 , and also, even if LiNbO 3 particle locally forms, it is easily dissolved in LiOH solution with strong alkalinity. Pure LiNb 3 O 8 powders are obtained with two absolutely opposite Li/Nb ratios: 8:1 and 1:3; the former shows a unique porous and hollow structure, quite different from the particle aggregation (the latter shows). Compared with Li/Nb = 1:3, the 4.2 times higher photocatalytic performance of LiNb 3 O 8 (Li/Nb = 8:1) are observed and it can be attributed to the unique porous and hollow structure, which provides a high density of active sites for the degradation of MB. Compared to LiNbO 3 , the improved photocatalytic performance of LiNb 3 O 8 can be attributed to its layered structure type with the reduced symmetry enhancing the separation of electrons and holes.
研究领域:
材料科学
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化学工程
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
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2022
·
IF 10.383
Li-Na Song,Li-Jun Zheng,Xiao-Xue Wang,Yi-Feng Wang,Yue Wang,Shuang Liang,Ji-Jing Xu
The design of highly efficient electrocatalysts is a promising strategy to improve the electrochemical kinetics of Li–CO2 batteries. However, electrocatalysts usually aim to reduce the energetic barrier for the corresponding electrochemical reactions; little attention has been given to modulating the kinetics that directly determine the local concentration of reaction molecules surrounding catalysts. Herein, we present a systematic study on the role of Li+ reunion on the improvement of reaction kinetics in Li–CO2 batteries with a Cu cone cathode. Specifically, this local, geometry-driven tip effect can enrich the local electron concentration to facilitate Li+ ions diffusion from the bulk electrolyte to the surface of catalyst, leading to boosted catalytic performance. Further studies demonstrate that Cu(II/I) as a solid redox mediator dominates the reversible bulk redox reactions in a Cu cone cathode, which acts as an electron–hole transfer agent and permits the efficient reduction and oxidation of solid Li2CO3, contributing to an accessible theoretical discharge voltage, low charge potential below 3.2 V, impressive rate capability, and a long cycling stability (333 days) for Li–CO2 batteries. The exploitation of the sharp-tip enhancement effect and dynamic creation of catalytic active sites is expected to become routine practice in future mechanistic studies for metal-air batteries.
研究领域:
电化学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Lei Ding,Dandan Li,Sihang Zhang,Shuo Zhang,Zhaoyang Wang,Fanghui Du,Pengfang Zhang,Feng Yang
Lithium metal batteries (LMBs) attract widespread attention under current high energy density developments. However, wild Li dendrite propagations owing to chaotic Li depositions raise challenges for LMB blossoming. Separators with specific demands thus should be involved when smoothly transferring into LMBs. In this research, a fascinating P(TPC@Lys-Li) separator is prepared by the turbulent interfacial polymerization and electrospinning to ingeniously clarify dependencies of Li + transfer dynamics on double electric layer thickness (DELT) regulations within porous skeletons. P(TPC@Lys-Li) enables negatively charged porous skeleton surface and compresses DELT, which constructs high-efficiency Li + fast-transfer channels on porous skeletons and accelerates Li + transfer speed by 18.3 times. Especially, P(TPC@Lys-Li) supplies extra Li + for stable formations of solid electrolyte interphase (SEI) layer, homogenizing nucleation and growth behaviors during Li depositions. Remarkable C-rate capacity and cycle stability thus arise for assembled LMBs, holding 87.2 % capacity retention after 700 cycles at 0.5C even under high cathode loading and lean electrolyte conditions. P(TPC@Lys-Li) also maintains constant physical scale and unabated mechanical strength even at elevated temperatures approaching 200 °C, which provides excellent battery security as LMBs encounter uncontrollable thermal runaway. Above attractive features enable P(TPC@Lys-Li) separator to be potentially applied in LMBs demanding sufficient security, high-capacity density, and fast charge technology.
研究领域:
材料科学
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电化学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
OPTIK
·
2017
·
IF 0.835
Renping Cao,Jijun Huang,Xiangfeng Ceng,Zuofu Hu,Ting Chen,Wen Hu,Xinqin Zhang
Ca 3 Nb 2 O 8 :Sm 3+ phosphor is synthesized by solid-state reaction method in air. Host Ca 3 Nb 2 O 8 emits blue light with excitation 260 and 314 nm, and its emission band peaking at ∼460 nm is attributed to the 3 T 1,2 → 1 A 1 transations in [Nb 2 O 8 6− ] group. Ca 3 Nb 2 O 8 :Sm 3+ phosphor with excitation 314 nm shows a systematically tunable emission by adjusting Sm 3+ ion concentration , and only emits reddish-orange light with excitation 407 nm. Excitation band indicates that Ca 3 Nb 2 O 8 :Sm 3+ phosphor may be effectively excited by (∼407 nm) near ultraviolet light-emitting diode chip. The optimal Sm 3+ ion concentration is ∼5 mol% in Ca 3 Nb 2 O 8 :Sm 3+ phosphor. Emission intensity of Ca 3 Nb 2 O 8 :Sm 3+ phosphor may be increased ∼1.4 times by co-doping Li + ions as charge compensator and fluxing agent roles. The experimental results will contribute to studying novel Sm 3+ -doped luminescent materials.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Energy Storage Materials
·
2021
·
IF 17.789
Yiwei Li,Shenyang Xu,Wenguang Zhao,Zhefeng Chen,Zhaoxi Chen,Shunning Li,Jiangtao Hu,Bo Cao,Jianyuan Li,Shisheng Zheng,Ziwei Chen,Taolue Zhang,Mingjian Zhang,Feng Pan
The oxygen activation, contributing to the high capacity (> 250 mA h g −1 ) of Li-rich transition metal (TM) layered oxides xLi 2 MnO 3 •yLiTMO 2 (TM = Mn, Ni, Co, Fe, etc.), is rooted in the unique 180 o Li-O-Li configuration due to the ordering arrangement of Li@Mn 6 superstructure units in Li 2 MnO 3 component (equivalent to Li[Li 1/3 Mn 2/3 ]O 2 ), but the relationship between the oxygen activation and the distribution of Li@Mn 6 superstructure units has not established. Herein, we comprehensively investigated the dispersion behavior of Li@Mn 6 superstructure units during the synthesis of a model compound Li[Li 1/6 Mn 1/3 Ni 1/3 Sb 1/6 ]O 2 (0.5 Li[Li 2/3 Mn 1/3 ]O 2 •0.5 Li[Ni 2/3 Sb 1/3 ]O 2 ) combining ex-situ X-ray diffraction (XRD) and in-situ / ex-situ transmission electron microscope (TEM). It revealed the entire process from the formation of Li@Mn 6 superstructure units, to the gradual fusion with Sb@Ni 6 superstructure units, eventually to the complete dispersion at 1100 °C. The systemic electrochemical tests demonstrated that, the dispersion of Li@Mn 6 superstructure units effectively suppressed the irreversible oxygen activation, and the best capacity and voltage retentions were obtained in the solid solution with the complete dispersion of Li@Mn 6 superstructure units. This work benefits the design of high performance Li-rich layered oxides with the modest anionic redox activity through the local structural tuning.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2018
·
IF 6.603
Ping Xu,Wei Wang,Xiaoming Qian,Haibo Wang,Changsheng Guo,Nan Li,Zhiwei Xu,Kunyue Teng,Zhen Wang
To effectively separate Mg 2+ and Li + from salt lake brine with high Mg 2+ /Li + mass ratio, a positive charged nanofiltration membrane with abundant -NH 3 + and -NH 2 + was designed and fabricated via interfacial polymerization between polyethyleneimine (PEI) and trimesoyl chloride (TMC) on the polyethersulfone ultrafiltration membrane. Zeta potential test revealed that at pH below 9.3, the resulting membrane exhibited a high positive charge due to a large amount of unreacted amine groups on the PEI branch. In the separation process, Donnan exclusion effect dominated the separation performance of resulting membranes for Mg 2+ and Li + . The results showed that the Mg 2+ /Li + mass ratio declined from initial 20 to 1.3 and the separation factor S Mg , Li was as low as 0.05 with a pure water permeation of 5.02 L/(m 2 hbar) after filtration with resulting NF membrane. The difference between the rejection for Mg 2+ and Li + reached up to 76%. Compared with membrane in previous studies, the separation performance for Mg 2+ and Li + of positive charged NF membrane prepared in this work increased more than one time. This research demonstrated the potential of positive charged PEI-TMC composite NF membrane for the separation of Mg 2+ and Li + from salt lake brine with high Mg 2+ /Li + mass ratio.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
LUMINESCENCE
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2018
·Vol. 33
·期 2
·438-442
·
IF 1.671
Ting Li,Zhijun Wang,Panlai Li,Shuchao Xu,Qiongyu Bai,Zhiping Yang
A novel tunable red emitting phosphor LiBaB 9 O 15 :Sm 2+ /Sm 3+ , Li + with broad excitation band was synthesized by a high temperature solid-state method. Luminescence properties were investigated in detail by luminescence, X-ray photoelectron spectroscopy (XPS) spectra and CIE chromaticity coordinates. XPS data confirmed that there were Sm 3+ in LiBaB 9 O 15 :Sm 3+ and Sm 2+ /Sm 3+ in LiBaB 9 O 15 :Sm 2+ /Sm 3+ , respectively. Spectral property of LiBaB 9 O 15 :Sm 3+ , LiBaB 9 O 15 :Sm 3+ /Sm 2+ and LiBaB 9 O 15 :Sm 2+ , Li + presented that the excitation band of Sm 3+ widened and the excitation band of Sm 2+ ranged from 350 to 450 nm. And the red light color is tunable with changing Li + concentration. The results indicated that LiBaB 9 O 15 :Sm 2+ /Sm 3+ , Li + may be promising red phosphor for white light emitting diodes.
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 ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yun Zhang,Xi Jiang,Xinrui Guo,Shihua Ding,Tianxiu Song
The Mg 1- x Li x ZrTa 2 O 8- x /2 ( x = 0–0.07) ceramics were fabricated to investigate the effects of Li + heterovalent substitution for Mg 2+ . The site occupancy and existence of the Li + were examined based on Vienna Ab-initio Simulation Package (VASP) and X-ray photoelectron spectroscopy (XPS), respectively. Single phase solid solution with wolframite structure was identified in the whole region. Li + substitution reduced the densification temperature from 1475 °C to 1400 °C. Notably, the Q × f exhibited an obvious increase by up to 74 % from 41,844 GHz at x = 0–72,782 GHz at x = 0.05. The Q × f for x < 0.01 was largely dependent on the intrinsic loss originating from packing fraction, while as 0.01 ≤ x ≤ 0.05, it was dominated by extrinsic factors, especially the oxygen vacancy concentration. The corresponding dielectric constant ε r decreased in term of ionic polarizability. The variations of resonant frequency temperature coefficient τ f were explained from the views of [TaO 6 ] oxygen octahedral distortion and bond energy. A near-zero τ f was obtained for x = 0.05 composition, accompanied by ε r = 11.97, Q×f = 72,782 GH at 1450 °C. Li substitution was effective and inexpensive for MgZrTa 2 O 8 ceramic to realize dielectric properties enhancement and densification temperature optimization simultaneously.
研究领域:
材料科学
·
陶瓷工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Chao Zhang,Tian Xie,Han Qu,Guofei Li,Zhongyu Zhao,Wanji Zhou,Shiai Xu,Zheng Li
The efficient separation and extraction of Li + from salt lake brines with a high Mg 2+ /Li + ratio remains challenging. Herein, poly(vinyl alcohol-co-ethylene) microcapsules encapsulating tributyl phosphate (TBP) and mono-2-ethylhexyl 2-ethylhexyl phosphate (P507) as carriers were successfully fabricated via one-step phase inversion followed by in situ cross-linking with boric acid. Correspondingly, the obtnined microcapsules possess a fine three-dimensional cross-linked network structure, which can effectively stabilize the extractant carriers and significantly enhance the encapsulation stability. These microcapsules were employed for the stable and selective extraction of Li + from high-Mg 2+ /Li + -ratio brines. The surface morphology, composition, structure, and adsorption characteristics of the TBP–P507 microcapsules were thoroughly investigated. The microcapsules comprising 30 wt% (m/m) polymer matrix and 70 wt% (m/m) TBP–P507 as the extractant (denoted as TBP–P507/P-3) exhibited the highest separation efficiency for Li + and Mg 2+ . The separation factor of Li + over Mg 2+ was up to 427, and the equilibrium adsorption capacity of the TBP–P507/P-3 microcapsules for Li + reached 0.83 mg/g in synthetic brine with a low Li + concentration and a high Mg 2+ /Li + ratio. These results illustrated that Li + could be separated with high selectivity over Mg 2+ . Adsorption kinetics and isotherms investigations indicated that Li + adsorption by TBP–P507/P-3 conformed to the pseudo-second-order kinetic model and was consistent with the Langmuir–Freundlich model, with the mechanism classified as chemisorption. Accordingly, the maximum amount of Li + adsorbed by the TBP–P507/P-3 microcapsules calculated using the Langmuir–Freundlich model was 4.4 mg/g. After 10 adsorption–elution cycles with pure water as the eluent, 96 % of the maximum equilibrium adsorption capacity was retained. The results clearly illustrate the construction of a finely-tuned three-dimensional cross-linked network structure is pivotal to enhancing stability of the microcapsules, efficiently decreasing the risk of carrier leakage from the involved polymer matrixes. Overall, this research presents a valuable microcapsule technology for separating and extracting Li + from high-Mg 2+ /Li + -ratio salt lake brines.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2019
·
IF 6.035
Gui Liu,Zhongwei Zhao,Lihua He
Here, we report a new liquid-membrane electrodialysis capable of selectively recovering lithium from high Mg/Li ratio brines. The liquid membrane is composed of an ionic liquid system as the Li + carrier that presents high selectivity toward Li + and long-term sustainability, and 2 solid cation-exchange membranes to sandwich the carrier. Recognition and selective electromigration of Li + can be achieved by the sandwiched liquid membrane assisted by an electric field. The Mg/Li decreases from 50:1 in the initial feeding brine to 0.5:1 in the receiving solution after electrodialysis at a current density of 4.375 A·m − 2 for 12 h. Moreover, higher current efficiency (65%) and lower specific energy consumption (16 Wh·g − 1 Li) are obtained compared to typical electrodialysis processes. From the perspective of practical application, the Mg/Li drops to 0.26:1 from 53:1 in the old brine from West Taijinair, and K + and Ca 2+ in the brine are almost completely blocked by the liquid membrane. This method displays a great perspective on the application for lithium recovery from high Mg/Li brines owing to its high selectivity, efficient energy utilization, and environmental friendliness.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Xuhui Wang,Xufeng Dong,Xinyi Song,Fangyuan Hu,Hao Huang,Min Qi
All solid-state battery (ASSB) as the breakthrough of the advanced lithium-ions battery owing to its superior energy density and safety. Solid electrolytes are required to possess excellent electrochemical and safety. However, the low ionic conductivity and the poor interfacial compatibility, respectively, limits the progress of polymer and ceramic electrolyte , which accelerate the development of composite solid electrolyte (CSE). Therefore, we demonstrate a hierarchy structure that PEO(polyethylene)-LLZO@NFPAN-SiO 2 , which consists of SiO 2 particles encapsulated nanofibers (in-situ hydrolyzed by TEOS) and flexible membrane of PEO-LLZO to synergistically elevate the performance of CSE. This CSE exhibits broad electrochemical window (6 V vs. Li) and strong ionic conductivity (3.3 × 10 −4 S cm −1 , 30 °C), and also shows robust strength (5.1 MPa). The assembled Li-symmetric cells exhibit superior cycling life of 1000 h, with an extremely modest over potential of 45 mV. The full cell exhibits excellent cycle stability, 102 mA h g −1 after 100 cycles at 0.5C, and a high initial Coulomb efficiency of 68 %. Skeleton-flesh structure is constructed by in-situ particle-embedded nanofiber and covered polymer, which strengthened mechanical capability, compatibility, inhibition of lithium dendrites , and introduced multi-Li + transport pathways, ensuring high safety and superior electrochemical performance for the applications of ASSBs.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Magnesium and Alloys
·
2022
·
IF 11.813
Xinfang Zhang,Ruihong Li,Xiaoyan Feng,Xue Pang,Xu He,Zili Jin,Huiping Ren,Dashuang Wang,Kailin Li,Xingjian Dai,Zhilan Du,Quan Zhou,Yuxin Zhang
A hierarchical superhydrophobic Al-Li layered double hydroxide (LDH) films with different Li + /Al 3+ molar ratios of 1:1, 1:2, 2:1, pH value of 11.5 and reaction temperature of 125 °C, have been fabricated on the surface of Mg-5Li-1Al (LA51) alloys by hydrothermal method following the characteristics of controllable cation structure and exchangeable anion between layers. The properties of the films were investigated by X-ray diffractometer (XRD), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS). XRD and SEM results indicate that the Al-Li LDH films are successfully prepared on LA51 alloys. The contact angle (CA) was measured to be about 100.7°, indicating that the surface wettability of the film converted from hydrophilic to hydrophobic by surface modification. The corrosion resistance of Al-Li LDH films was evaluated by Tafel polarization curve and electrochemical impedance spectroscopy (EIS). Surprisingly, Tafel polarization curve and EIS test reveal that the Al-Li LDH films prepared at the molar ratio of Li + /Al 3+ 1:2, pH 11.5 and temperature 125 °C have better corrosion resistance in 0.1 M NaCl neutral solution. In addition, the formation mechanism and corrosion mechanism of the films on the surface of LA51 alloy are also proposed. It provides innovative synthetic materials and novel design ideas for the preparation of high-efficiency anti-corrosion coatings on LA51 alloys, whose application can be extended in industrial fields.
研究领域:
材料科学
·
腐蚀与防护
✓ 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）