JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Ciming Wang,Huiqun Ju,Xiaolong Zhou,Pengrui Zhang,Zixuan Xue,Lianjing Mao,Fei Shao,Yan Jing,Yongzhong Jia,Jinhe Sun
6 Li and 7 Li, two natural isotopes of lithium, play an important role in the nuclear industry. Here, a system of ionic liquid-crown ether was fabricated for lithium isotope separation and the 6 Li isotope separation coefficient can reach 1.406 that showing a good prospect for lithium isotope separation by this method of electromigration. Interestingly, the single crystal containing crown ether and lithium, in which 7 Li was enriched, was obtained from the experiments. It is contrary to popular wisdom and can be attributed to the steric hindrance effect. This provides a new route to separate lithium isotopes, that is electromigration coupling with crystallization.
研究领域:
核科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 16
·9029-9038
·
IF 11.9
Yuxuan Li,Jing Yang,Xingzhao Zhang,Ximing Cui,Qinmin Pan
Solid polymer electrolytes (SPEs) have attracted growing attention because of their good processability and nonflammability. However, their applications in solid-state batteries are restricted by their limited ionic mobility in the electrolyte bulk and at electrode/electrolyte interfaces. Herein, this issue can be effectively addressed by using a composite polymer electrolyte (CPE) consisting of a polyethylene (PE) separator with polyethylene glycol (PEG) brushes and SN-based electrolyte. The presence of PEG brushes effectively expedites Li+ diffusion but hinders TFSI− migration, which endows the PE-PEG CPE with an improved diffusion coefficient (DLi+, 2.50 × 10−13 m2 s−1) and a high Li+ transference number (tLi+, 0.69). Importantly, the PEG brushes act as “Li+ bridges” to allow Li+ to migrate through various interconnected interfaces in the whole battery. The solid-state LiFePO4‖Li batteries with PE-PEG CPE present excellent cycling stability over 1000 cycles at a high rate (3C). Pouch cells using the prepared CPE exhibit high specific capacity at 1C and superior safety. Our study offers an alternative solution toward the fabrication of SPEs with high Li+ transportability, which have potential application in high-energy-density solid-state batteries.
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
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2024
·
IF 4.7
Liu-bin SONG,Tian-yuan LONG,Min-zhi XIAO,Min LIU,Ting-ting ZHAO,Yin-jie KUANG,Lin JIANG,Zhong-liang XIAO
A composite solid electrolyte comprising a Cu−Al bimetallic metal-organic framework (CAB), lithium salt (LiTFSI) and polyethylene oxide (PEO) was fabricated through molecular grafting to enhance the ionic conductivity of the PEO-based electrolytes. Experimental and molecular dynamics simulation results indicated that the electrolyte with 10 wt.% CAB (PL-CAB-10%) exhibits high ionic conductivity (8.42×10 −4 S/cm at 60 °C), high Li + transference number (0.46), wide electrochemical window (4.91 V), good thermal stability, and outstanding mechanical properties. Furthermore, PL-CAB-10% exhibits excellent cycle stability in both Li−Li symmetric battery and Li/PL-CAB- 10%/LiFePO 4 asymmetric battery setups. These enhanced performances are primarily attributable to the introduction of the versatile CAB. The abundant metal sites in CAB can react with TFSI − and PEO through Lewis acid–base interactions, promoting LiTFSI dissociation and improving ionic conductivity. Additionally, regular pores in CAB provide uniformly distributed sites for cation plating during cycling.
研究领域:
材料科学
·
电化学
·
电池技术
·
聚合物科学
✓ 已验证
DOI
高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
·
2022
·
IF 5.443
Zijin Yang,Xianying Qin,Kui Lin,Qiuchan Cai,Yongzhu Fu,Baohua Li
In recent years, lots of efforts have been applied to improve the initial Coulombic efficiency (ICE) of lithium-ion batteries (LIBs), among which prelithiation is considered to be one of the most promising schemes. Here we report a modified Li x Si with high lithium reserves and great environmental adaptability as the prelithiation reagent, which can make up for the capacity loss of the negative electrode in the first cycle. Through the chemical reaction between aluminum isopropoxide and Li x Si, a protective layer consisting of Li x Al y SiO z /Li 2 O is formed on the surface of Li x Si particles. This synthesized material provides a new idea for the actual industrial production of prelithiation.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Jian Lu,Yingying Qin,Qi Zhang,Yilin Wu,Jiuyun Cui,Chunxiang Li,Liang Wang,Yongsheng Yan
High-selective multilayered Li + -imprinted membranes (Li-IIMs) with enhanced hydrophilicity and stability were developed based on polyether sulfone substrate membranes. The multilayered structure was prepared with polydopamine (pDA) as the interfacial adhesion layer, SiO 2 nanoparticles as the hydrophilic layer and Li + -imprinted polymers as the imprinted layer. The selective “Li + -recognition sites” were formed using 12-crown-4 (12C4) as the adsorbing units. The optimal relative selectivity coefficients (α) of Li + /Na + and Li + /K + reached up to 1.85 and 2.07 with the imprinting factor ( β ) of 2.51, and the high permselectivity factors ( γ ) of Na + /Li + (7.39) and K + /Li + (9.86) were achieved on Li-IIMs. The Langmuir isotherm model and the pseudo-second-order kinetics model best fitted the rebinding data of Li-IIMs, as well as the rebinding capacities reached up to 90.3% of initial binding after 5 cycles of adsorption/desorption and just declined to 88.1% after another 5 cycles a month later. Therefore, the as-prepared Li-IIMs would have potential applications for the separation of lithium ions from salt lake brines.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 34
·期 4
·2306399
·
IF 19
Haoyang Jiang,Junqing Liu,Bin Tang,Zhendong Yang,Xinghui Liang,Xinyu Yu,Yirong Gao,Jinping Wei,Zhen Zhou
The practical implementation of garnet-type solid electrolytes, such as Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 (LLZTO), faces the significant challenge of Li dendrites. Though artificial interfacial strategies are effective in dendrite suppression, further investigation is needed to understand the mechanism of homogeneous Li deposition and its practicability under real-world conditions. Herein, a bilayer interface is constructed to address these issues. Such a bilayer interface consists of one conformal Li 2 O-rich layer, generated by rubbing LLZTO pellets inside molten Li with low-dose In 2 O 3 , and another Li 2 O layer deposited through atomic layer deposition (ALD). The regulatory effect of the initial Li 2 O-rich layer on achieving uniform Li deposition is explored, and the critical current density is enhanced to 2.4 mA cm −2 . However, simple interfacial strategy is insufficient to prevent anodic degradation for cycling at room temperature without stack pressure, leading to increased current leakage and directly reducing Li + within the electrolyte. After insulating it with a second ALD-Li 2 O layer that minimally hampers ionic conduction, the Li/Li symmetric cells achieve long cycling life exceeding 1000 h at 0.5 mA cm −2 and maintain stable operation even at 2 mA cm −2 . This work provides valuable insights for interfacial strategies towards practical solid-state batteries.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 39
·20666-20676
·
IF 11.301
Die Su,Li Liu,Zhixiao Liu,Jing Dai,Jiaxing Wen,Min Yang,Sidra Jamil,Huiqiu Deng,Guozhong Cao,Xianyou Wang
Ta-doped TiO2/C nanofibers are synthesized by an electrospinning method. First-principles calculations reveal that the Ta dopant can lower the Li/K diffusion barrier, which is beneficial for improving the rate capability. According to the electronic structure analysis, the dopant can obviously shift the conduction band of TiO2 downward, resulting in significantly improved electronic conductivity. Ta doping causes phase transformation from anatase to rutile, and increases the specific surface area. The well-designed rutile Ta-doped TiO2/C nanofibers show outstanding electrochemical properties in both Li-metal half cells and K-metal half cells, which are much better than those of pristine anatase TiO2/C nanofibers. At 2 A g−1, 5% rutile Ta-doped TiO2/C nanofibers could deliver high reversible specific capacities of 399 mA h g−1 in Li-ion batteries after 1000 cycles whereas deliver 148 mA h g−1 in K-ion batteries after 800 cycles. When assembled, the full cells with 5% rutile Ta-doped TiO2/C nanofibers as the anode and commercial LiFePO4/perylene-3,4,9,10-tetracarboxylic dianhydride as the cathode show excellent cycling performance and can light up more than 18 LEDs. These results demonstrate that Ta-doped TiO2/C nanofibers are a promising anode material for Li/K ion batteries.
研究领域:
材料科学
·
电化学
·
纳米技术
·
能源存储
✓ 已验证
DOI
高影响因子
Energy Advances
·
2022
·Vol. 1
·期 12
·1028-1034
·
IF 0
Lei He,Jian-Hua Cao,Ya-Kun Wang,Da-Yong Wu
Increasing the proportion of inorganic electrolytes in organic–inorganic composite electrolytes can significantly improve the ionic conductivity of composite electrolytes. However, this method is confronted with some problems, such as the uneven dispersion of inorganic electrolytes and the aggregation of nanoparticles, which results in a worse performance of the electrolytes’ interface. In this study, we had the dopamine hydrochloride molecules self-polymerized on the surface of inorganic ionic conductor lithium titanium aluminum phosphate (LATP) particles to obtain PDA-coated LATP nanoparticles. Then, the coated LATP particles were composited with PEO at a ratio of 80 : 20, with the LATP's evenly dispersed in the PEO, and no aggregation happened. On adding a small amount of electrolyte (5 μL cm−2, 1 M Li TFSI), the ionic conductivity of the electrospun PI-loaded PEO0.2–PDA@LATP0.8 flexible composite solid electrolyte reached 2.07 × 10−4 at 30 °C and 2.05 × 10−3 S cm−1 at 80 °C. NCM811‖Li batteries assembled with this electrolyte had an initial discharge capacity of 178.0 mA h g−1 at 30 °C, and still remained at 172.1 mA h g−1 (96.7%) after 200 cycles. The research shows that there are three main conduction pathways of Li+ in this electrolyte: through the segments of the polymer chains, through the interface between the polymer and inorganic ionic conductor, and through the passage composed of a continuous inorganic ionic conductor. Further results show that the coating of LATP by PDA does not block the transmission of Li+ both inside the crystal and at the crystal interface of LATP.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Pengqian Guo,Pengfeng Jiang,Weixin Chen,Guoyu Qian,Deyan He,Xia Lu
Interfacial engineering plays an important role in dynamically stabilizing the electrochemical performance of lithium-sulfur batteries (LSBs). Constructing a robust interface, e.g., using a multifunctional membrane, benefits not only for the suppression of lithium polysulfides (LiPSs) shuttling, but also for the inhibition of uncontrollable Li dendrite growth. Herein, a bifunctional membrane is fabricated with the Al 2 O 3 nanoparticle-embedded polyacrylonitrile nanofibers (Al 2 O 3 /PAN) in a facile way as separator, which are found effective in blocking the growth of Li dendrite and the shuttling of LiPSs in LSBs. The exposed Al 2 O 3 nanoparticles work in a responsible way to physiochemically capture the LiPSs and simultaneously let the Li ions shuttle through the PAN nanofiber network as the simulation indicated. The 3D cross-linked membrane can also block the oriented Li deposition and growth to make the symmetric Li||Li cell cycle over 1500 h without short circuit at 0.5 mA cm −2 . Moreover, the LSB exhibits a reversible capacity of 2.08 mAh cm −2 at 500 mA g −1 under the sulfur loading of 3.6 mg cm −2 . These results provide a doable and economy way to fabricate the robust membrane to deal effectively with the tough issues, which sheds new light on the design and optimization of high-energy-density sulfur prevailed rechargeable batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
电池技术
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 9
·3337-3347
·
IF 4.39
Panpan Du,Siyuan Li,Xuejiao Wang,Qi Zhu,Ji-Guang Li
Solid-state reaction at 1000 °C produces a series of Li-stuffed Li5+2x(La1−yEuy)3(Ta1−xZrx)2O12 garnet phosphors (x = 0–1, y = 0.05–0.6) that exhibit favorable efficiency and thermal stability for red luminescence under either blue or n-UV light excitation, where the optimal composition was identified to be x = 0.5 and y = 0.4. The concentration quenching of luminescence was determined to occur via electric dipole–dipole interactions. Zr4+ substitution for Ta5+, accompanied by additional Li+ for charge compensation, was found via Rietveld structure refinement and Raman/UV-Vis spectroscopy to profoundly affect the tetrahedral and octahedral occupancies of Li, the symmetry of (La/Eu)O8 dodecahedron, and the bandgap of the host lattice and cation disorder, with which the systematically varying excitation and emission behaviors of Eu3+ were deciphered. The Li6(La0.6Eu0.4)3(Ta0.5Zr0.5)2O12 optimal phosphor showed quantum yields of ∼40 and 48% under 393 and 463 nm excitations, respectively, a fluorescence lifetime of ∼0.66 ms for its main emission at 610 nm, color coordinates of around (0.653, 0.347), and can retain as high as ∼85% of its room-temperature emission intensity at 423 K. The phosphor also exhibited a favorable performance for n-UV excited LED lighting.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
PubMed
高影响因子
ACTA MATERIALIA
·
2014
·
IF 3.94
D. Xu,W.L. Li,L.D. Wang,W. Wang,W.P. Cao,W.D. Fei
The high piezoelectric properties of piezoelectric ceramics are typically obtained by inducing a phase transition between two ferroelectric phases, using either the morphotropic phase boundary (MPB) or the polymorphic phase transition (PPT). Here we demonstrate that neither the MPB nor the PPT is necessary to achieve high piezoelectric properties. Our results show that the optimized distribution of Li + –Al 3+ pairs parallel to the [0 0 1] direction, as found in our x LiAlSiO 4 /BaTiO 3 ( x LAS/BT) lead-free piezoelectric ceramic system prepared from ordinary raw materials by conventional solid-state reaction sintering , can generate a large piezoelectric constant ( d 33 ) of 378 pC/N when x = 7.5 mol.%. The d 33 value of the 7.5 mol.% LAS/BT ceramic is more than three times that of the pure BT ceramic. The distortion connected to the proposed Li + –Al 3+ pairs locally creates unit cells of less than tetragonal symmetry, and these low-symmetry cells can be responsible for the high piezoelectric response. The high-temperature stability testing reveals that these doped ceramics are usable at temperatures as high as 120 °C. This piezoelectric mechanism coming from the doping ionic pairs provides a new method to achieve large piezoelectric properties in a wide range of ABO 3 -type perovskite systems.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 1.5
Su Yongyou,Zhu Bowen,Zhang Yingjie,Meng Qi,Dong Peng
With the rapid development of the global economy, energy crisis and environmental protection problems are in urgent need of solution. And the development of energy-saving and new energy vehicles is an inevitable trend to improve the energy structure, alleviate the conflict between oil supply and demand, and improve the living environment of human beings. Layered high nickel material is considered as one of the most promising cathode materials for power batteries because of its high energy density, high platform potential and good rate capability. However, it has problems such as high dependence on cobalt resources and poor cycling stability. In this paper, the preparation of layered high nickel cobalt-free cathode materials is investigated. Because Fe element has the advantages of large reserves and low price. At the same time, Fe makes the layered structure of the positive electrode more stable. In this paper, LiNi 0.8 Mn 0.17 Fe 0.03 O 2 (Li/TM = 1.01, 1.03, 1.05) materials with different Li/TM ratios were prepared by solid-phase method to investigate the effects of different Li/TM ratios on the structural and electrochemical properties of LiNi 0.8 Mn 0.17 Fe 0.03 O 2 materials. The results show that the materials synthesized with different Li/TM ratios have a layered structure. When the Li/TM ratio is 1.03, the crystal structure is the best and the degree of Li/Ni mixing is the least. The electrochemical performance study shows that the synthesized materials have the optimal electrochemical performance at the Li/TM ratio of 1.03. The electrochemical behavior during lithium embedding/delithiation was also investigated by quasi-in situ XRD, dQ/dV and CV tests. This study will provide some reference and guidance for the development and application of next-generation low-cost cobalt-free lithium-ion batteries.
研究领域:
材料科学
·
能源科学
✓ 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）