Nano Energy
·
2024
·
IF 16.8
Shuai Li,Hongyu Liu,Luojia Zheng,Chuntao Ma,Hailong Yu,Xiaodong Wu,Xiaobin Niu,Liping Wang
As the “blood” of batteries, the electrolyte is generally expected to be designed reasonably to meet the demands of stable energy storage in high energy density batteries. This study introduces a rational design for localized high-concentration electrolytes (LHCEs) by incorporating the weakly coordinating diluent 1, 1, 2, 2-tetrafluoro-1-methoxyethane (TFM) to modulate the solvation of Li + alongside the anion and solvent 1, 2-diethoxyethane (DEE). The resulting LiFSI-DEE/2TFM electrolyte (1 M LiFSI in DEE/TFM at a ratio of 1:2, volume) demonstrates a significant efficacy in suppressing the dissolution of lithium polysulfides (LiPSs) while maintaining a good ionic conductivity. Moreover, this electrolyte facilitates the formation of a stable cathode-electrolyte interphase (CEI) and promotes uniform plating/stripping of Li + at the lithium anode. Consequently, based on this electrolyte, the Li/FeS 2 cells exhibit an exceptional specific capacity and a good cycling stability from room temperature to −20°C. Notably, even at −20°C, over 80 % of the room-temperature specific capacity (692.7 mAh g −1 @150th) is retained for the cell using LiFSI-DEE/2TFM, showing its robust performance in challenging environments. Furthermore, the Li/FeS 2 cell also demonstrates an outstanding durability at high current density (≥ 2 C) under room temperature.
研究领域:
材料科学
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电化学
·
能源存储
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2022
·
IF 4.889
Zhiyi Gao,Zongjing Lu,Yining Zhang,Jing Xia,Xuejing Zhang,Chao Sun,Yijun Yang,Yong Xu,Ke Wang,Xi Wang,Jiannian Yao
Li-ion batteries (LIBs) suffer from severe capacity recession at subzero temperatures due to the dramatic increase in charge transfer resistance induced by the sluggish desolvation process. In this paper, we report on by using the weakly coordinating molecule as electrolyte (1 M LiPF 6 in EC: DMC: PC = 1:1:1 vol%), the cell with MoS 2 as the model electrode exhibits better cycling performance and rate capability than the cell using commercial electrolytes (1 M LiPF 6 in EC: DMC = 1:1 vol%). Theoretical calculations and infrared spectroscopy indicate that PC is a weakly coordinated electrolyte molecule to Li + . Further, the electrochemical kinetics indicates that more Li + in the as-made electrolyte can intercalate into the MoS 2 layer. The electrochemical impedance spectroscopy reveals that the weak interaction between Li + and solvent molecules reduces the activation energy of desolvation process. This novel design concept opens up new paths to exploit the advanced electrolyte for LIBs.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
ACS Applied Polymer Materials
·
2021
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IF 4.089
Wenzhuo Zhu,Shuai Zhou,Jian Wang,Wen Sun,Jinxing Chen,Ming He
Natural soft materials can generate a reversible transition between soft and tough states triggered by environmental stimuli. Inspired by this, various synthetic hydrogels with dynamic reversible crosslinks are developed. In this study, a weak coordination-induced dynamic crosslinked hydrogel is successfully synthesized. High concentrations of Ca2+ ions are coordinated with acrylamide, which then catalyze ammonium persulfate decomposition for rapid polymerization to a polyacrylamide (PAAm)/Ca hydrogel at room temperature. The preassembled coordination provides sufficient crosslinks, accompanied by enhanced hydrogen bonding during dehydration, which together endows the gel with high mechanical properties. This weak coordinated crosslinked structure is affected by humidity, leading to a wide range of mechanical properties of the gel, with the tensile strength ranging from 44.2 kPa to 5.6 MPa, elastic modulus from 17.3 kPa to 2.2 MPa, and toughness from 312.3 kJ/m3 to 7.8 MJ/m3. Additionally, Ca2+ ions preferentially coordinate with amides in the hydration process, and the gel exhibits an abnormal hydration phenomenon under low humidity. The gel with high polymer content has a higher water loss ratio and volume shrinkage. On this basis, we design an asymmetric bilayer structure gel and realize the curling and stretching of leaves and petals. Interestingly, the bilayer gel exhibits reversible adhesion properties and the tearing energy is up to 3985.9 J/m2 under low humidity. This principle may provide ideas and inspiration for producing hydrogels with adjustable mechanical strength and develop a route to construct versatile stimulus-responsive materials.
研究领域:
材料科学
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化学
·
生物材料
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Yuhang Guo,Zixun Tang,Zexu Li,Jiang Wu,Yingying Fu,Jian Liu,Zhiyuan Xie
The processing solvents strongly impact the crystallization and optoelectronic properties of the resultant perovskites. However, limited by the solubility of perovskites, available processing solvents for perovskite light-emitting diodes (PeLEDs) are restricted to only a few strongly coordinated and polar solvents, such as dimethyl sulfoxide (DMSO). The strong coordination capability of DMSO with Pb 2+ excessively affects the crystallization of perovskites, often necessitating anti-solvent engineering to regulate the crystallization process. Here, a strategy of weakly coordinated co-solvent comprising 2-methoxyethanol (2-ME) and propylene carbonate (PC) is proposed to fabricate quasi-2Dperovskites and PeLEDs. This co-solvent exhibits synergistic properties—complementary coordination capability and dielectric constant—yielding superior solvation capability compared to either solvent alone. Crucially, the tunable, moderate solvation strength of the 2-ME:PC mixture facilitates perovskites crystallization while suppressing detrimental low-dimensional phase growth, enabling anti-solvent-free fabrication of high-quality formamidinium-based quasi-2D perovskites. Employing this optimized co-solvent, pure green PeLEDs are achieved that comply with Rec. 2020 standards, boasting a remarkable external quantum efficiency of 26.2%. This work presents an effective strategy for the facile fabrication of high-performance PeLEDs, while also guiding the selection of additional perovskite processing solvents.
研究领域:
材料科学
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光电子学
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纳米技术
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半导体器件
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光伏与发光
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
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IF 9.9
Ning Yuan,Xinling Zhang,Tianxiang Chen,Hao Xu,Qibao Wang
Environmental pollution by emerging contaminants has become an urgent problem. Herein, novel binary metal–organic framework hybrids were constructed from Materials of Institute Lavoisier-53(Fe) (MIL-53(Fe)) and zeolite imidazolate framework-8 (ZIF-8) for the first time. A battery of characterizations were employed to determine the MIL/ZIF hybrids' properties and morphology. Furthermore, the MIL/ZIF towards toxic antibiotics (tetracycline, ciprofloxacin and ofloxacin) were studied to explore their adsorption abilities. The present work disclosed that the obtained MIL-53(Fe)/ZIF-8 = 2:3 possessed an eminent specific surface area with an admirable removal efficiency of tetracycline (97.4%), ciprofloxacin (97.1%) and ofloxacin (92.4%), respectively. The tetracycline adsorption process conformed to the pseudo-second-order kinetic model and this process was more compatible with the Langmuir isotherm model with the highest adsorption capacity of 215.0 mg g −1 . Moreover, the process of removing tetracycline was proved to be spontaneous and exothermic by the thermodynamic results. Furthermore, the MIL-53(Fe)/ZIF-8 = 2:3 towards tetracycline exhibited significant regeneration ability. The effects of pH, dosage, interfering ions and oscillation frequency on tetracycline adsorption capacity and removal efficiency were also investigated. The primary factors contributing to the decent adsorption ability between MIL-53(Fe)/ZIF-8 = 2:3 and tetracycline included electrostatic , π–π stacking, hydrogen bonding and weak coordination interactions. Additionally, we also investigated the adsorption ability in real wastewater . Thus, the proposed binary metal–organic framework hybrid materials can be deemed a promising adsorbent in wastewater purification.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
PubMed
高影响因子
Small
·
2023
·Vol. 19
·期 52
·2305357
·
IF 13.3
Yingjun Chai,Chaoyan Jiang,Xudong Hu,Jiguang Han,Yao Wang,Wanqiu Yang,Chongkang Li,Haibo Zeng,Xiaoming Li
Solution-processed organic–inorganic hybrid perovskite polycrystalline thick films have shown great potential in X-ray detection. However, the preparation of compact perovskite thick films with large area is still challenging due to the limitation of feasible ink formulation and pinholes caused by solvent volatilization. Post-treatment and hot-pressing are usually involved to improve the film quality, which is however unsuitable for subsequent integration. In this work, a homogeneous bridging strategy is developed to prepare compact perovskite films directly. A stable perovskite slurry with suitable viscosity consisting of undissolved grains and supersaturated solution is formed by adding a weak coordination solvent to the pre-synthesized microcrystalline powders. Small perovskite grains in situ grow from the saturated solution during the annealing, filling the pinholes and connecting the surrounding original grains. As a result, large-area perovskite thick film with tight grain arrangement and ultralow current drift is blade-coated to achieve X-ray imaging. The optimal device displays an impressive mobility-lifetime product of 2.2 × 10 −3 cm 2 V −1 and a champion ratio of sensitivity to the dark current density of 2.23 × 10 11 µC Gy air −1 A −1 . This work provides a simple and effective route to prepare high-quality perovskite thick films, which is instructive for the development of perovskite-based X-ray flat-panel detectors.
研究领域:
材料科学
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纳米技术
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半导体器件
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X射线检测
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薄膜加工
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）