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Clarification of the dispersion mechanism of cathode slurry of lithium-ion battery under effects of both poly vinylidene fluoride/carbon black ratio and mixing time

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Particuology 2024年第5期88卷 116-127页

作者： Zhilong Wang Zhenzhen Zhao Ye Yang An Zhang Xiayi Liu Tong Zhao Yahui Cui School of Mechanical and Precision Instrument Engineering Xi'an University of TechnologyXi'an 710048China

This paper presents the effects of both poly vinylidene fluoride(PVDF)/carbon black(CB)ratio(m PVDF:m CB)and mixing time t on the dispersion mechanism of the cathode slurry of lithium-ion battery(LIB).The dispersion mechanism is deduced from the electrochemical,morphological and rheological properties of the cathode slurry by using electrical impedance spectroscopy(EIS),scanning electron microscopy and rheology methods,*** the perspective of EIS method,static simulation models are established in the COMSOL Multiphysics software;meanwhile,the simulated results are used to verify the correctness of the electrochemical properties of the cathode *** a result,the following conclusions are able to be ***,in the case of the mass ratio m_(PVDF):m_(CB)=5:10,LiCoO_(2) particles are completely coated by the mixture of CB and PVDF to form a stable polymer gel *** or lower m_(PVDF):m_(CB) leads to the larger impedance and worse dispersion status for the cathode ***,when t=6 min,a good gel-like conductive network structure is formed by coating the thinner evenly dispersed CB–PVDF double layer around LiCoO_(2) ***,a strategy regarding to both m_(PVDF):m_(CB) and t in experimental scale is proposed,which has the capability of improving the performance of LIB.

关键词： Cathode slurry dispersion mechanism Lithium-ion battery(LIB)

Atomic Force Microscopy Measurement in the Lignosulfonate/Inorganic Silica System:From dispersion mechanism Study to Product Design

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Engineering 2021年第8期7卷 1140-1148页

作者： Jingyu Wang Yong Qian Yijie Zhou Dongjie Yang Xueqing Qiu School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou 510641China State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhou 510640China

Designing and preparing high-performance lignin-based dispersants are crucial steps in realizing the value-added utilization of lignin on an industrial *** process depends heavily on an understanding of the dispersion mechanism of lignin-based ***,atomic force microscopy(AFM)is employed to quantitatively investigate the dispersion mechanism of a lignosulfonate/silica(LS/SiO_(2))system under different pH *** results show that the repulsive force between SiO_(2)particles in LS solution is stronger than it is in water,resulting in better dispersion *** Derjaguin–Landau–Verwey–Overbeek(DLVO)formula as well as the DLVO formula combined with steric repulsion is utilized for the fitting of the AFM force/distance(F/D)curves between the SiO_(2)probe and substrate in water and in LS *** on these fitting results,electrostatic and steric repulsive forces are respectively calculated,yielding further evidence that LS provides strong steric repulsion between SiO_(2)*** studies indicate that the adsorbance of LS on SiO_(2)(Q),the normalized interaction constant(A),and the characteristic length(L)are the three critical factors affecting steric repulsion in the LS/SiO_(2)*** on the above conclusions,a novel quaternized grafted-sulfonation lignin(QAGSL)dispersant is designed and *** QAGSL dispersant exhibits good dispersing performance for SiO_(2)and real cement *** work provides a fundamental and quantitative understanding of the dispersion mechanism in the LS/inorganic particle system and provides important guidance for the development of high-performance lignin-based dispersants.

关键词： Lignin Silica Atomic force microscopy dispersion mechanism Product design

Synthesis, Properties and dispersion mechanism of Sulphonated Acetone-formaldehyde Superplasticizer in Cementitious System

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Journal of Wuhan University of Technology(Materials Science) 2013年第6期28卷 1167-1171页

作者： LIU Ming LEI Jiaheng DU Xiaodi FU Chengfei HUANG Bo School of Materials Science and Engineering Wuhan University of Technology Department of Chemistry School of ScienceWuhan University of Technology China Construction Ready-mixed Concrete Co. Ltd.

The synthesis, properties and dispersion mechanism of sulphonated acetone-formaldehyde superplasticizer （SAF） were presented. This superplasticizer was synthesized by the reaction among acetone, formaldehyde, sodium sulfite and pyrosulfite. The structure and property were respectively characterized by IR and surface tension measurement. Performance of SAF in cement was evaluated by paste flow as well as heat calorimetry. The dispersion mechanism was identified via adsorption and zeta potential measurement. The results show that cement paste mixed with SAF shows good fluidity. SAF exerts little retarding effect on cement paste and it behaves like a typical polycondensate superplasticizer. The main dispersion mechanism of SAF is attributed to electrostatic repulsion.

关键词： sulphonated acetone-formaldehyde superplasticizer dispersion mechanism zeta potential cement paste

Dispersive Ability of Carboxylated Cellulose Nanofibrils for Aqueous Monolayer Montmorillonite dispersion:Influence of Na^(+) and Ca^(2+) Concentrations

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Paper And Biomaterials 2022年第1期7卷 28-37页

作者： Kaihuang Chen Chuan Sun Guanhui Li Jinhao Huang Zhiqiang Fang Xueqing Qiu School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhouGuangdong Province510640China State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhouGuangdong Province510640China School of Chemical Engineering and Light Industry Guangdong Provincial Key Laboratory of Plant Resources BiorefineryGuangdong University of TechnologyGuangzhouGuangdong Province510006China

Carboxylated cellulose nanofibrils(CNFs)have emerged as effective green dispersants for monolayer montmorillonite(MMT)***,their dispersion capability is sensitive to the metal ion concentration in aqueous ***,this study investigated the effects of Na^(+) and Ca^(2+) concentrations on the dispersive ability of carboxylated CNFs for monolayer MMTs in *** crystal microbalance with dissipation monitoring(QCM-D)and atomic force microscopy(AFM)were utilized to explore the interfacial interactions between the carboxylated CNFs and monolayer MMTs under different Na^(+) and Ca^(2+) *** the concentration of Na^(+) reached 0.1 mmol/L,the adhesion mass of carboxylated CNFs on MMT-coated wafer peaked at 24.47 mg/m^(2),higher than control sample(carboxylated CNF-dispersed monolayer MMT dispersion without metal ions,16.03 mg/m^(2)).Moreover,the electrostatic shielding effect promoted a better dispersion of monolayer MMTs by carboxylated CNF *** a further increase in the Na^(+) concentration,the surface charge of CNFs and MMTs would be reversed resulting from the improved electrostatic shielding effect,which weaken the dispersive ability of carboxylated *** addition of Ca^(2+) reduced the dispersive ability of carboxylated CNFs for monolayer MMTs,because Ca^(2+) required a lower concentration for the onset of charge reversal compared to Na^(+).This study provides interfacial scale insights into the influence of metal ion concentration on carboxylated CNF-dispersed monolayer MMT *** also provides a strategy to enhance the dispersive ability of carboxylated CNFs for monolayer MMTs.

关键词： monolayer montmorillonite carboxylated cellulose nanofibrils dispersion mechanism metal ion

Preparation of ultrafine silver powders with controllable size and morphology

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Transactions of Nonferrous Metals Society of China 2018年第3期28卷 524-533页

作者： Qing-hua TIAN Duo DENG Yu LI Xue-yi GUO School of Metallurgy and Environment Central South UniversityChangsha 410083China Cleaner Metallurgical Engineering Research Center Nonferrous Metals Industry of ChinaCentral South UniversityChangsha 410083China

The ultrafine silver powders were prepared by liquid reduction method using Arabic gum as *** effects of different dispersants,pH values,and temperature on the morphology and particle size of silver powders were *** is found that Arabic gum can better adsorb on silver particles via chemical adsorption,and it shows the best dispersive effect among all the selected *** particle size of silver powders can be finely tuned from 0.34 to 4.09μm by adjusting pH values,while the morphology of silver powders can be tuned by changing the *** silver powders with high tap density higher than 4.0 g/cm3 were successfully prepared in a wide temperature range of 21.8-70°***,the tap density is higher than 5.0 g/cm3 when the temperature is optimized to be 50°*** facile process and high silver concentration of this method make it a promising way to prepare high quality silver powders for electronic paste.

关键词： ultrafine silver powder Arabic gum dispersion mechanism tap density controllable preparation