ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Qian Zhang,Kang Liu,Kun Liu,Liang Zhou,Chunjie Ma,Yaping Du
Solid lithium ion electrolyte is a critical component for the development of all solid state lithium ion battery . In this study, a solid polymer electrolyte (SPE), PVO is successfully prepared using the monomers of 1-vinylimidazole (1-Vm) and oligo(ethylene oxide) methyl ether methacrylate (OE) to investigate the introduction of small amount of imidazole moiety (8.3 mol%) of high coordination capability and its effect on lithium ion conductivity. LiTFSI and LiClO 4 are used to compare the effect from different types of lithium salt , their concentrations are regulated from 5 wt% to 20 wt%. The highest lithium ion conductivities of 1.30 × 10 −6 S cm −1 at 25 °C and 2.57 × 10 −5 S cm −1 at 70 °C are obtained when the content of LiTFSI is 15 wt%. Generally, when LiClO 4 is used, the ionic conductivity of SPE is lower than that when LiTFSI is used. But the lithium transference number with LiClO 4 is higher than LiTFSI. Both types of lithium salt show similar and relatively high electrochemical stability up to 4.7 V versus Li + /Li, and good cycling performances in lithium deposition/stripping experiments. Though imidazole group is able to coordinate to Lewis acid as used in organic synthesis, and may seriously bother the transportation of lithium ion, however the study doesn’t show the evidence. The findings may allow the design of more delicate chemical and aggregate structure in the explore of new lithium ion conducting materials.
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 CHEMICAL AND ENGINEERING DATA
·
2021
·
IF 2.694
Yongmei Xuan,Bosheng Duan,Kaile Fang,Yaqi Ding,Neng Gao,Guangming Chen
The vapor pressure properties of ionic liquids (ILs) 1-ethyl-3-methylmidazolium iodide ([Emim]I) and 1,3-dimethylimidazolium iodide ([Dmim]I) as absorbent species in lithium chloride aqueous solution (LiCl/H2O) are experimentally investigated. The vapor pressure data of ternary IL mixtures, LiCl + [Emim]I + H2O (mass ratio LiCl/[Emim]I = 3) from a temperature of 338.26–419.83 K at three mass fractions of the absorbent (0.3, 0.4, and 0.5) and LiCl + [Dmim]I + H2O (mass ratio LiCl/[Dmim]I = 3) from a temperature of 354.54–427.23 K at four mass fractions of the absorbent (0.3, 0.4, 0.5, and 0.54), were measured and reported using the boiling point method. The Antoine-type equation was used to fit the experimental data. The average absolute relative deviation (AARD%) values of the experimental data and the calculation results were 0.416 and 0.515%, respectively. By comparing the measured vapor pressure data with a binary mixture (LiCl + H2O), the ternary system of lithium bromide aqueous solution and the same IL (LiBr + ILs + H2O), and ternary mixtures of lithium chloride and ILs of the same organic cation (LiCl + ILs + H2O), it was found that, under experimental conditions, the order of vapor pressures of the proposed ternary systems is LiCl + [Dmim]I + H2O < LiCl + [Emim]Cl + H2O < LiCl + H2O, LiCl + [Emim]I + H2O < LiBr + [Emim]I + H2O, LiCl + [Dmim]I + H2O < LiBr + [Dmim]I + H2O, LiCl + [Emim]I + H2O < LiCl + [Emim]Cl + H2O < LiCl + [Emim]Br + H2O, and LiCl + [Dmim]I + H2O < LiCl + [Dmim]DMP + H2O < LiCl + [Dmim]Cl + H2O < LiCl + [Dmim]BF4 + H2O.
研究领域:
化学工程
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
ChemElectroChem
·
2019
·Vol. 6
·期 17
·4637-4644
·
IF 3.975
Lei Zhang,Hongyu Wang
Graphical Double time : It is demonstrated that the concentrated solution of 3 M LiPF 6 -ethyl methyl carbonate/trimethyl phosphate (7 : 3 by vol.) is also compatible with graphite negative and works well for full dual-graphite batteries. Although trimethyl phosphate (TMP)-based electrolyte solutions are effective to resist flames in non-aqueous electrical energy storage devices, they are usually not so compatible with Li-graphite negative electrodes. Herein, we solve this problem by increasing the concentration of LiPF 6 salt in the solution. A benchmark graphite negative electrode (MCMB, mesocarbon microbeads) can deliver a capacity over 325 mAh g −1 and maintain good cyclability in a solution of 3 M LiPF 6 -ethyl methyl carbonate (EMC)/TMP (7 : 3 by vol.). Moreover, our previous work has confirmed that the graphite positive electrode also works very well in the above solution. Therefore, this solution can cater to both anion-graphite and Li-graphite intercalation electrodes, which enables the construction of dual-graphite batteries (DGBs). There are some problems arising during the DGB operation, and corresponding strategies are proposed.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE IONICS
·
2018
·
IF 2.751
Yulan Li,Zhongfa Yang,Zhenrui Wu,Jie Li,Jian Zou,Cheng Jiang,Jingyi Yang,Liping Wang,Xiaobin Niu
In this study, the effects of lithium salts (i.e. LiPF 6 , LiClO 4 and LiN(SO 2 CF 3 ) 2 ) and solvents (i.e. carbonate and ether type) on the Li metal anode electrochemical performance are systematically studied. It is found that LiN(SO 2 CF 3 ) 2 , denoted as LiTFSI, in 1,3-dioxolane (DOL) and 1,2-dimethoxyethane (DME) as electrolyte offers the best performance with a cycle life of 1100 h under the capacity of 2 mAh/cm 2 and current density of 2 mA/cm 2 . Lithium stripping/plating produces porous loose lithium powders rather than dendrites. Both lithium salts and solvents have influences on the lithium powder nucleation and growth. In the LiTFSI-DOL/DME system, lithium metal after stripping/plating has a relative flat and dense surface, which concomitantly brings in a low charge transfer resistance , low solid electrolyte interphase resistance, and elongated cycle life. A high Li + transference number and a high Li + -solvent interaction force are beneficial to an even Li + flux and a stable Li-electrolyte interface. This study sheds light on the importance of electrolytes for high performance lithium metal anodes.
研究领域:
电化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2016
·
IF 2.196
Xiuhua Hao,Shuni Li,Quanguo Zhai,Yucheng Jiang,Mancheng Hu
The (solid + liquid) equilibrium (SLE) and (liquid + liquid) equilibrium (LLE) of RbCl/CsCl + ethylene carbonate (EC) + H 2 O ternary systems were carefully investigated at 298.15 K. The SLE and LLE data were correlated by the corresponding equations respectively. Furthermore, the thermodynamic properties of RbCl/CsCl in the EC–water systems were determined by potentiometric method at T = 298.15 K. The experiment data were correlated by the Pitzer, modified Pitzer and the extended Debye–Hückel equations. The mean activity coefficients, osmotic coefficients and excess Gibbs free energies, standard Gibbs free energy of transfer and the standard solubility product of systems were calculated. The mean activity coefficient γ ± decreases with the increase of the molality of electrolyte at the fixed mass fraction of EC. But γ ± vary abnormally with the increase of the EC content. The result of Δ G t 0 reflects the spontaneously transfer of the electrolytes from water to the mixed solvents.
研究领域:
物理化学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2014
·
IF 5.211
Kai Liu,Jiang-Tao Ma,Chang-An Wang
Garnet type electrolyte “Li 6.5 La 3 Ta 0.5 Zr 1.5 O 12 ” (LLZTO) was prepared by conventional solid-state reaction in alumina crucibles and excess lithium salt (from 0% to 50 mol%) was added into the starting materials to investigate the effects of excess lithium salt on the property of LLZTO. SEM, XRD and AC impedance were used to determine the microstructure, phase formation and Li-ion conductivity. Cubic garnet with a minor second phase LiAlO 2 in the grain boundary was obtained for the pellets with excess lithium salt. As the amount of excess lithium salt increased, more Al element diffused from alumina crucibles to LLZTO pellets and reacted with excess lithium salt to form liquid Li 2 O–Al 2 O 3 phase in the grain boundary, which accelerated the pellets' densification and reduced lithium loss at a high temperature. Ionic conductivity of LLZTO pellets increased with the amount of excess lithium salt added and leveled off at ∼4 × 10 −4 S cm −1 when lithium salt exceeded 30 mol%. The performance of Li-air batteries with hybrid electrolytes, using homemade LLZTO thin pellets as solid electrolytes , was investigated. The LLZTO thin pellet with more excess lithium salt in starting material had a higher density and resulted in better cell performance.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2024
·
IF 2
Yang-Dian-Dian Wang,Shi-Hua Sang,Han-Zhong Zhang,Ling-Xuan Wang
The solid–liquid phase equilibria of the ternary system LiBr–Li2SO4–H2O at 273.15, 288.15, and 308.15 K were investigated by the isothermal dissolution equilibrium method. The equilibrium solid phases were identified by X-ray powder crystal diffraction. The isothermal phase diagrams of the ternary system at different temperatures were drawn in detail. The equilibrium phase diagrams of the ternary system at 273.15, 288.15, and 308.15 K have one invariant point, two univariate curves, and two crystallization fields (corresponding to LiBr·2H2O and Li2SO4·H2O), respectively. The results show that LiBr has a strong salting-out effect on Li2SO4, and the solubilities of LiBr will be greatly improved with an increase in temperature. Furthermore, multiple linear regression and programming analysis are used to fit the single salt parameters (β(0), β(1), and Cφ) and the mixed ion interaction parameters (ψLi+,Br–,SO42–) of lithium salt at 288.15 and 308.15 K. The Pitzer model and particle swarm optimization (PSO) were used to predict the solubilities in the ternary system at multitemperatures, and the phase diagrams of calculation and experiment are drawn accordingly. The experimental results and model predictions are in good agreement, indicating that fitted ion interaction parameters in this work of the Pitzer model have good applicability.
研究领域:
化学热力学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Crystals
·
2025
·Vol. 15
·期 2
·158
·
IF 2.4
Zhennan Yao,Enza Migliore,Massimiliano Galluzzi,Jingze Liu
Urbanization in hot and humid regions such as southern China has increased the demand for comfortable indoor environments. In order to design a material for efficient passive indoor humidity regulation, this study investigates a composite material that combines the hygroscopic properties of salt and the adsorption capacity of diatomaceous earth (DE). Firstly, we prepared DE and boehmite into moisture-absorbing porous materials. Then, the initial DE-based sample was innovatively doped with SiO2nanomaterials and loaded with LiCl to enhance the humidity regulation ability of the composite, especially in the adsorption and desorption ability of water vapour. The microstructure and phase composition of the composite samples were analysed, and we observed an increase in porosity, filling performance and capillary condensation upon the introduction of SiO2nanoparticles. The hygroscopic salt loaded into the pores can absorb more water when exposed to the ambient humidity. This synergic effect can effectively improve the hygroscopic performance of the composite material while maintaining the stability of the physical and chemical properties. The optimized samples showed a moisture absorption rate of 28% in high-humidity environments, meeting moisture buffer value evaluation standards. The study’s findings lay the foundation for the future integration of these materials through advanced manufacturing technologies.
研究领域:
建筑材料学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2021
·
IF 17.881
Jiazheng Zhou,Xiao Xu,Biwen Duan,Huijue Wu,Jiangjian Shi,Yanhong Luo,Dongmei Li,Qingbo Meng
Alkali metal doping, typically Li + doping, is beneficial for CZTSSe solar cells. Herein, aiming at the low solubility of conventional LiF which is hard to directly introduce into the precursor solution , an organic lithium salt (LiTFSI, lithium bis(trifluoromethanesulfonyl)imide) has been introduced into fabricating CZTSSe solar cells for the first time. 13.2% PCE (power-conversion-efficiency) with 12.7% certified PCE has been achieved with relatively higher V OC and FF, which is the highest efficiency of lithium-doping/alloying devices so far. A comprehensive investigation on the influence of LiTFSI on the formation of precursor and selenized absorber films has been carried out. The existence forms of LiTFSI in different processes are revealed as well as the relevant mechanism. That is, during selenization, LiTFSI decomposes to LiF at early stage, then LiF combines with Se to afford the Li-Se liquid fluxing intermediate, which can facilitate the phase transition and crystal growth to give compact CZTSSe films with larger grains and less pinholes, thus leading to better surface morphology and electric properties of LiTFSI doped CZTSSe absorber films. Li + doping is thus found to enable reducing interfacial defects , improving band bending and lowering V OC deficit. This work provides an easy way to precisely modify Li + salt amount in the precursor solution and subsequent CZTSSe selenization process by using organic lithium salts for high quality CZTSSe crystals and high-performance devices.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Shiyou Li,Dongni Zhao,Peng Wang,Xiaoling Cui,Fengjuan Tang
To satisfy the need of 5 V high-voltage cathode materials, lithium difluoro(oxalato)borate (LiDFOB) with excellent film-forming property has been chosen as lithium salt , and adiponitrile (ADN) with stable electrochemical performance has been evaluated as functional additive. An electrochemical investigation of this novel electrolyte solution shows a wide electrochemical oxidation window of nearly 6.0 V vs Li + /Li. Due to the positive effect of ADN on the cathode/electrolyte interface, LiNi 0.5 Mn 1.5 O 4 /Li half-cell with ADN-adding electrolyte exhibits prominent rate capability and cyclability. It is believed that the improvement of electrochemical performances has benefitted greatly from interfacial impedance reducing. Two modeling hypotheses have been used to explain interfacial interaction between ADN and LiNi 0.5 Mn 1.5 O 4 , by the means of analysis of X-ray photoelectron spectroscopy and theoretical calculation. Results show that ADN can enrich the surface of cathode material to hinder the further decomposition of the electrolyte, and contribute to the formation of a cathode-electrolyte interface passivation film with protective and conductive properties.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
MACROMOLECULES
·
2023
·
IF 5.5
Jirong Wang,Chi Zhang,Yong Zhang,Gong Chen,Rinaldo Poli,Xiaolin Xie,Zhigang Xue
Assembling polymer electrolytes (PEs) with lithium metal anodes is a promising strategy to address safety and specific capacity concerns. Molecular design on conductive polymer matrices avoids inherent high crystallinity, poor ion transport, and combustion drawbacks by adjusting the chain structure and functional groups. However, conventional structural modulation methods are difficult to conduct via in situ polymerization and cell assembly, thus hampering the further performance enhancement of PEs in lithium batteries. Herein, we report a simple aza-Michael addition method induced by lithium salts for designing and fabricating high-performance PEs. This method fulfills the in situ structure modulation of polyether-based PEs without any introduction of non-electrolytic components. The obtained polyether electrolytes exhibit a more amorphous cross-linked structure, leading to a favorable medium for ion migration and excellent flexibility. In addition, the introduction of C–N bonds imparts excellent non-flammability to the material as well as the ability to interact with sulfolane. Hence, the in situ-constructed gel polymer electrolyte (GPE) is characterized by a high ionic conductivity (1.76 × 10–4 S cm–1 at 30 °C) and excellent interface stability with the electrodes. The assembled Li/LiFePO4 (LFP) battery based on this newly designed GPE exhibits a high initial specific discharge capacity and a good rate performance (112.7 mAh g–1 at 5 C). Long-term stability was also demonstrated, with a capacity retention of 86.8% after 500 cycles at 0.5 C.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Shi Jia Li,Guang Tao Fei,Shao Hui Xu,Wen Chao Chen,Hai Yan Xu,Xiao Xuan Qu,Xin Feng Li,Hao Miao Ouyang
Poly (ethylene oxide) (PEO)-based solid-state electrolytes are the most researched and widely used polymer solid-state electrolytes, but their ionic conductivity, electrochemical stability window, and cycling stability all need further improvement. In this work, 15 Crown ether 5 and the high concentration of lithium salts are added into PEO solid-state electrolytes using a solution-casting approach. The resulting solid-state electrolyte exhibits an ionic conductivity of 3.14 × 10 −3 S cm −1 at 60 °C and an electrochemical stability window exceeding 5.2 V. The assembled Li//Li symmetric battery can be stably cycled for over 850 h at a current of 0.1 mA cm −2 , and the LiFePO 4 //Li battery has an initial discharge capacity of 144 mA h g −1 at 2C rate, retaining 85 % of its capacity after 800 cycles. By optimizing the solid-state electrolyte components, Li//Li symmetric batteries can achieve cycling stability for up to 2200 h, and LiFePO 4 //Li batteries can endure up to 2000 cycles at a 2C rate and 4800 cycles at a 5C rate. Moreover, the prepared solid-state electrolyte can be matched with a high-voltage cathode electrode, offering a wide range of potential applications and promising commercialization prospects.
研究领域:
材料科学
·
能源存储
·
电池技术
✓ 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）