Polymers
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2019
·Vol. 11
·期 8
·1306
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IF 3.164
Shiqi Wang,Chun Wei,Wenwen Ding,Linmin Zou,Yongyang Gong,Yuanli Liu,Limin Zang,Xu Xu
A high-voltage electrolyte can match high-voltage positive electrode material to fully exert its capacity. In this research, a sulfolane plasticized polymer electrolyte was prepared by in situ photocuring. First, the effect of the sulfolane content on the ionic conductivity of the gel polymer electrolyte was investigated. Results showed that the ionic conductivity variation trend was in good agreement with the exponential function model for curve fitting. Second, the activation energy was calculated from the results of the variable temperature conductivity tests. The activation energy was inversely proportional to the sulfolane content. For the sulfolane content of 80 wt. % in gel polymer electrolyte (GPE)-80 (19.5 kJ/mol), the activation energy was close to conventional liquid electrolyte (9.5 kJ/mol), and the conductivity and electrochemical window were 0.64 mS/cm and 5.86 V, respectively. The battery cycle performance test showed that the initial specific discharge capacities of GPE-80 and liquid electrolyte were 176.8 and 148.3 mAh/g, respectively. After 80 cycles, the discharge capacities of GPE-80 and liquid electrolyte were 115.8 and 41.1 mAh/g, and the capacity retention rates were 65.5% and 27.7%, respectively; indicating that GPE-80 has a better specific discharge capacity and cycling performance than the liquid electrolyte. SEM images indicated that GPE-80 can suppress the growth of lithium dendrites. The EDS test showed that GPE-80 can inhibit the dissolution of metal ions in the cathode material.Keywords:lithium battery;sulfolane;gel polymer electrolyte;high-voltage electrolyte;UV curable
研究领域:
材料科学
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电化学
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DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2020
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IF 5.065
Hong Li,Yuhao Zhang,Liang Zhao,Dexin Sun,Jinsen Gao,Chunming Xu
Separation of sulfides from fluid catalytic cracking (FCC) naphtha is of great significance for environmental protection. In this work, the organic solvents N -methyl-2-pyrrolidone (NMP), sulfolane (SUL), and their mixtures were selected to extract sulfides (3-methylthiophene) from model FCC naphtha (n-heptane). Correspondingly, the liquid-liquid phase equilibrium (LLE) data of the systems n-heptane +3-methylthiophene + SUL/NMP/(NMP + SUL) were experimentally obtained at 298.15 K and 101.3 kPa. The distribution coefficient and separation factor were calculated to assess the extraction performance of the solvents. The results showed that mixed solvent (NMP + SUL) could be used as a potential solvent to extract 3-methylthiophene due to its suitable selectivity and solubility. Meanwhile, the density functional theory (DFT) method was applied to explore the extraction mechanism of 3-methylthiophene from n-heptane by NMP or SUL. Electrostatic potential (ESP) analysis, interaction energies, and reduced density gradient (RDG) analysis showed that the main interactions between NMP/SUL and 3-methylthiophene were van der Waals and weak hydrogen bond forces. In addition, the LLE data were correlated by the NRTL and UNIQUAC thermodynamic models with the RMSD values were all <0.30%. Also, the binary interaction parameters were regressed which could be applied for the optimization and design of the separation process.
研究领域:
化学工程
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环境科学
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理论化学
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DOI
高影响因子
ENERGY & FUELS
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2024
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IF 5.2
Guangjie Chen,Guangying Chen,Miao Fa,Yuxian Yang,Yu Wang,Fei Li,Li Sze Lai,Swee Pin Yeap
In order to reduce the regeneration energy consumption of CO2 capture in the postcombustion capture process and explore the regulatory characteristics of phase separation, a series of 1-amino-2-propanol (MIPA)/sulfolane biphasic solutions were proposed to capture CO2. The effects of the molar ratio on the phase separation behavior, CO2 equilibrium absorption, and desorption performances of MIPA/solfolane biphasic absorbents as well as three ternary solutions with the extra addition of ethanolamine (MEA) were investigated comprehensively in experiments. The results showed that the 4M/5M MIPA/sulfolane biphasic solution exhibited excellent performance with higher CO2 loadings in the phase separation point for a CO2-rich liquid (0.4530 mol/mol), better desorption efficiency (85.53%), and relatively low regeneration energy consumption (32% lower than 30 wt % MEA). Besides, MEA has a positive effect on promoting the phase separation of the MIPA/sulfolane solution and reducing the desorption energy consumption. Furthermore, 1H and 13C nuclear magnetic resonance (NMR) spectroscopy was used to explore the reaction and phase separation mechanisms. The results indicated that generated carbamate salts can increase the ionic strength of the aqueous solution, leading to the accumulation of reacted MIPA or MEA in the water phase and the exclusion of sulfolane from water to form a new liquid phase. The results of this work can provide theoretical support for the future industrial application of MIPA/sulfolane biphasic absorbents and offer some guidance for the mechanism exploration of other biphasic solvent systems.
研究领域:
化学工程
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环境科学
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物理化学
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DOI
高影响因子
Journal of Energy Chemistry
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2022
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IF 13.599
Yunju Wang,Hongyu Wang
The anion storage behavior of graphite positive electrode in a dual-ion battery is closely related to the solvation of anion in the corresponding electrolyte solution. The classical electrolyte solutions of LiBF 4 -sulfolane (SL) have long been recognized in the community of lithium batteries and still appear promising in dual-ion batteries. Nevertheless, the solvation of BF 4 − by SL has seldom been addressed before. In this study, the solvation states of SL-BF 4 − are adjusted by varying LiBF 4 concentration or introducing auxiliary salts of LiPF 6 or SBPBF 4 (SBP: spiro-(1,1′)-bipyrrolidinium) in the electrolyte solutions of Li/graphite dual-ion cells. The electrochemical storage processes of SL-BF 4 − anions in graphite electrodes are investigated through in situ X-ray diffraction measurements. Two kinds of graphite intercalation compounds (GICs) with contrastive intercalation gallery heights (IGHs) have been discovered, which are ascribed to the storage of different kinds of SL-BF 4 − anions in graphite electrode. The interactions between ions and SL in the electrolyte solutions are characterized by Fourier transform infrared spectroscopy and then correlated with the performance of Li/graphite cells.
研究领域:
电化学
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材料科学
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能源存储
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物理化学
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电池技术
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Can Cheng,Jianjun Li,Jinyan Cao,Jiaxiu Guo,Wanglai Cen
The absorption properties of N-(2-hydroxyethyl) morpholine (HEM), morpholine (MP) and N-(2-aminoethyl) morpholine (AEM) for SO 2 were studied using sulfolane (SUL) as solvent in this work. Among these solvent combinations, HEM/SUL shows the best cyclic absorption performance, and the capacity of HEM-SUL-40 (40 wt% of HEM and 60 wt% of SUL) to absorb 8580 mg/m 3 SO 2 (the remainder is N 2 ) is 192.18 mg/g at 293.15 K. The absorption capacity of the second cycle is 97.5% of the first absorption cycle, which is higher than 70% of the Cansolv amine solution in a commercial application with similar experimental conditions. However, MP/SUL is difficult to desorb at high temperature, and the absorption capacity of AEM/SUL is much lower than HEM/SUL and MP/SUL. According to the FTIR , 1 H NMR and 13 C NMR, all three cyclic amines have charge transfer effects with SO 2 . The structure of HEM/SUL can be recovered after heating, but MP cannot be recovered. Δ r G m ° in the reaction against HEM with SO 2 increases significantly with increasing temperature. The Δ r G m ° of HEM-SO 2 and MP-SO 2 at 353.15 K is −12.56 kJ/mol and −16.29 kJ/mol, respectively, which further explains the easy desorption of HEM-SO 2 and the difficult desorption of MP-SO 2 at high temperature.
研究领域:
化学工程
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环境科学
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物理化学
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DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
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2024
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IF 7.1
Jiasheng Tong,Miao Wang,Xuejun Qiu,Shizhen Li,Hangqi Yang,Chuang Peng
Deep eutectic solvents (DESs) are promising media for CO2 electroreduction because of their high CO2 solubility, low cost, and eco-friendliness. However, the high viscosity and poor ionic conductivity severely limit their applications. In this study, low-viscosity polar aprotic solvents, propylene carbonate (PC) and sulfolane (SL), were used as diluents in Ethaline (ChCl:2EG) to prepare mixed electrolytes for electrochemical CO2 reduction. Raman and infrared spectra indicate that PC and SL can participate in the eutectic network of Ethaline through intermolecular hydrogen bonding, thereby decreasing the viscosity. The current density of the Ag cathode increases from 1.7 to 8.0 and 5.3 mA/cm2 with the addition of PC and SL, respectively. The two diluents also result in improved CO faradaic efficiency (FECO) and suppressed HER because the C═O and S═O bonds in the molecular frameworks of PC and SL can disrupt the hydrogen bonds of accumulated water molecules during electrolysis. At −2.0 V, FECO increases from 63% to over 90% upon the addition of PC and SL. This study provides new insights into the design of high-performance DES electrolytes for CO2 electroreduction.
研究领域:
电化学
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材料科学
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环境科学
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产品关联
DOI
高影响因子
APPLIED ENERGY
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2024
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IF 10.1
Bingling Yuan,Zhen Chen,Qianxuan Zhang,Guoxiong Zhan,Lei Xing,Zhoulan Huang,Yuchen Li,Lidong Wang,Junhua Li
Chemisorption with biphasic solvents is a promising low-energy strategy for separating CO 2 from industrial flue gas, however, amine degradation and changes in water content can considerably impede the phase-splitting performance. To the issues, tetramethylene sulfone (TMS) was selected as separating agent to prepare a biphasic solvent with polyamine triethylenetetramine (TETA) with a TETA:TMS:H 2 O ratio of 2:6:2 (denoted as 20 T-60TMS). The CO 2 loading of the blended phase and the volume fraction of the rich phase were 2.56 mol/L and 35.4%, respectively; the total regeneration heat duty was 2.36 GJ/tCO 2 . The proposed biphasic solvent exhibited better resistance to oxidative degradation and thermal degradation than did previously reported solvents, attributed to the beneficial effect of TMS. Additionally, the degradation products did not substantially reduce the phase separation performance after a 360 h thermal degradation test. A dynamic phase-splitting evaluation revealed that the 20 T-60TMS solvent was robust to changes in water content. Theoretical calculations confirmed that the introduction of TMS weakened the hydrogen bond between TETACOO − /TETAH + and H 2 O, engendering enhanced TETACOO − and TETAH + self-aggregation, forming a strong hydrogen bond network, and achieving fast phase separation. This work provides a novel biphasic solvent with excellent tolerance and stability for CO 2 capture from flue gas.
研究领域:
化学工程
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环境科学
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材料科学
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产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
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2024
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IF 12.7
Peifeng Feng,Lichun Ma,Xin Zhou,Mingzhuan Li,Qinghua Zhang,Mingguang Zhang,Xingyao Liu,Xigao Jian,Jian Xu
A gradient modulus interface layer was designed between the carbon fiber and the epoxy by grafting the rigid polymer PPENK and the flexible polymer PEI. The influence of the interfacial modulus on the mechanical performance of carbon fiber/epoxy composite at different temperatures was analyzed. At room temperature, compared with the desized CF composite , the mechanical properties (interfacial shear, interlaminar shear, flexural strength , flexural modulus , and impact strength) of CF-PPENK-PEI composites were increased by 32.2 %, 11.4 %, 34.8 %, 24.2 % and 20.3 %, respectively. This improvement was attributed to the interfacial phase PPENK-PEI, which improved the roughness and polarity of the CF surface, increased wettability with the matrix, and buffered and balanced the modulus discrepancy between the CF and the epoxy. Atomic force microscopy (AFM) was confirmed the existence of a gradient modulus interface layer in CF-PPENK-PEI/epoxy composites. Notably, at 180 °C, the interlaminar shear strength (ILSS), flexural strength and flexural modulus of the CF-PPENK composite increased by 86.7 %, 92.5 % and 113.0 %, respectively, compared with the commercial CF composite, indicating better thermomechanical stability due to PPENK rigid heteroaromatic structures, which can maintain a high modulus at elevated temperature. Additionally, the dynamic thermomechanical properties of the composites were demonstrated the outstanding thermomechanical stability of the CF-PPENK/epoxy composites interface. Overall, this work provides a theoretical basis for preparing CF composites for use in high-temperature fields.
研究领域:
材料科学
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复合材料工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Min Zheng,Mingzhen Shi,Xingbang Hu,Zhuoheng Tu,Youting Wu
Efficient separation and recovery of hydrogen chloride (HCl) from HCl tail gas containing impurities such as sulfur dioxide (SO 2 ) is very important from the viewpoint of economy and environment. However, due to the similar dissolution ability of SO 2 and HCl , most solvents, including organic solvents, ionic liquids and deep eutectic solvents (DESs), show low SO 2 /HCl selectivity near 1.0 and are thus incompetent to separate SO 2 /HCl. To address this, we firstly reported the task-specific design of a novel class of protic metal-based DESs (PM-DESs) containing hydrochloride, metal chloride and sulfolane, which have good SO 2 affinity but much inhibited HCl uptake, for the separation of HCl/SO 2 . The solubility data of SO 2 and HCl in PM-DESs were determined and correlated by Krichevsky-Пiinskaya (K-I) equation. Among these PM-DESs, N,N -dimethylaniline hydrochloride (DMA·HCl) + zinc chloride (ZnCl 2 ) + sulfolane exhibits satisfactory recyclability and selectivity up to 2.669 (100 kPa, 313.2 K), which is the highest value reported so far. Absorption of HCl/SO 2 (50/50) mixed gas was also tested, with a high SO 2 /HCl selectivity of 3.250 obtained. In addition, the NMR and FTIR spectroscopic characterizations paired with quantum chemistry calculation were utilized to investigate the absorption mechanism from the perspective of atomic level. The DESs developed in the present work have the potential to separate and recycle HCl from SO 2 owing to their good selectivity and desirable reversibility, and the strategy proposed in this work may offer new guidance for designing green media for HCl recovery.
研究领域:
化学工程
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环境科学
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材料科学
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产品关联
DOI
高影响因子
Energy Storage Materials
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2024
·
IF 18.9
Bingfei Dai,Xiaofan Shi,Xudong Pei,Feng Xu,Yang Zhao
Flexible aqueous lithium-ion batteries are promising safe power sources for next-generation of portable and wearable electronic devices due to their intrinsic safety and eco-friendliness. However, water-related side reactions in aqueous electrolytes have greatly limited their operating voltage and electrochemical performance. Herein, we report a new family of 2.4 V high-voltage flexible aqueous lithium-ion fiber battery by designing a fluorine-free and high-voltage synergistic dual co-solvents aqueous hybrid electrolyte with high ionic conductivity , low cost, and high safety. Sulfolane and trimethyl phosphate are used as synergistic dual co-solvents, which can not only extend the electrochemical stability window of electrolyte to 3.3 V by suppressing the activity of water, but also form a S-/P-containing inorganics-rich solid electrolyte chlorination interphase for better electrochemical performance. Combined with novel flexible hybrid fiber electrodes, the resulting flexible aqueous fiber batteries exhibit high working voltage plateau (2.4 V, much higher than most reported flexible aqueous batteries), high energy density (146.5 Wh kg −1 ), and superior cycling performance (500 cycles). In addition, these aqueous fiber batteries present impressive mechanical flexibility, which can be easily woven into clothes to power wearable electronics. This work is an inspiration for the design of next-generation of flexible batteries with both high energy and safety.
研究领域:
材料科学
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能源存储
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产品关联
DOI
高影响因子
Carbon Capture Science & Technology
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2024
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IF 10.4
Xiaobin Zhou,Yunqiong Tang,Chao Liu,Shengpeng Mo,Yinming Fan,Dunqiu Wang,Bihong Lv,Yanan Zhang,Yinian Zhu,Zongqiang Zhu,Guohua Jing
To tackle the prevalent challenges encountered with polyamine-based non-aqueous absorbents (NAAs), particularly the formation of viscous products and inferior regeneration performance, this study proposed an innovative synergistic regulation strategy that integrated 2-amino-2-methyl-1-propanol (AMP) and n-propanol (NPA). Accordingly, a novel tertiary tetraethylenepentamine (TEPA)-AMP-NPA (T-A-N) NAA was devised. The optimized T-A-N maintained complete homogeneity throughout the entire CO 2 absorption process and achieved an impressive CO 2 loading of 1.15 mol·mol −1 while maintaining a low viscosity of merely 22.47 mPa·s. Remarkably, its absorption capacity showed little decrement after four consecutive absorption-desorption cycles, underscoring its exceptional recyclability. Within the T-A-N system, AMP underwent a reaction with CO 2 , yielding AMP-carbamate and protonated AMP, while TEPA engaged in CO 2 absorption to form zwitterionic carbamates. During the desorption process, NPA served as a regeneration activator, facilitating the conversion of stable TEPA-carbamates into less stable alkyl carbonate intermediates, thereby enhancing the T-A-N's regeneration performance. Moreover, the T-A-N system addressed the issue of TEPA-carbamate self-aggregation into insoluble gelatinous substances by leveraging the synergistic enhancement effects between AMP derivatives and NPA. Specifically, these components effectively bound TEPA-carbamate species via robust electrostatic affinity and intermolecular hydrogen-bond interactions, inhibiting their self-aggregation and preventing the formation of insoluble products. Furthermore, T-A-N exhibited a significant reduction in both sensible and latent heat requirements, by 67 % and 82 % respectively, compared to 30 wt% MEA, highlighting its advantageous energy-saving potential for CO 2 capture. Overall, harnessing the synergistic enhancement effects of AMP and NPA was conducive to the development of polyamine-based NAAs that offered superior CO 2 capture reversibility, low energy consumption, and resistance to insoluble product formation.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2024
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IF 2.2
Fangfang Dai,Jiangting Cao,Na Liu,Meiyuan Peng,Chen Wang
In order to separate n-hexane/ethyl acetate (EA) produced in industrial production, the liquid–liquid extraction was used to separate the azeotropic system with sulfolane , 1,2-propanediol and dimethyl sulfoxide (DMSO) as extractants. The liquid–liquid equilibrium (LLE) data of the n-hexane + EA + sulfolane/1,2-propanediol/DMSO were measured at 303.15 K, 313.15 K and 323.15 K. The extraction capacity of the extractants were evaluated by the distribution coefficient (D) and separation factor (S). The LLE data were correlated using the NRTL and UNIQUAC thermodynamic models to obtain binary interaction parameters. The root mean square deviation (RMSD) were all less than 0.02 indicating that the two models were suitable for the phase equilibrium behavior. GUI-MATLAB software was used to test the reliability of the regressed binary interaction parameters. The Dmol 3 module of the Materials Studio was used to analyze σ-profile of n-hexane, EA and extractants and to assess the interaction energy between the components. The results show that sulfolane is the best extractant for the separation of n-hexane + EA.
研究领域:
化学工程
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分离科学
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热力学
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DOI
高影响因子
危险品化学品经营许可证（带存储）