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
Zhilong Wang, Zhenzhen Zhao, Ye Yang, An Zhang, Xiayi Liu, Tong Zhao, Yahui Cui
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引用次数: 0
Abstract
This paper presents the effects of both poly vinylidene fluoride (PVDF)/carbon black (CB) ratio (mPVDF:mCB) 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, respectively. From 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 slurry. As a result, the following conclusions are able to be obtained. Firstly, in the case of the mass ratio mPVDF:mCB = 5:10, LiCoO2 particles are completely coated by the mixture of CB and PVDF to form a stable polymer gel structure. Higher or lower mPVDF:mCB leads to the larger impedance and worse dispersion status for the cathode slurry. Secondly, when t = 6 min, a good gel-like conductive network structure is formed by coating the thinner evenly dispersed CB–PVDF double layer around LiCoO2 particles. Finally, a strategy regarding to both mPVDF:mCB and t in experimental scale is proposed, which has the capability of improving the performance of LIB.
期刊介绍：
The word ‘particuology’ was coined to parallel the discipline for the science and technology of particles.
Particuology is an interdisciplinary journal that publishes frontier research articles and critical reviews on the discovery, formulation and engineering of particulate materials, processes and systems. It especially welcomes contributions utilising advanced theoretical, modelling and measurement methods to enable the discovery and creation of new particulate materials, and the manufacturing of functional particulate-based products, such as sensors.
Papers are handled by Thematic Editors who oversee contributions from specific subject fields. These fields are classified into: Particle Synthesis and Modification; Particle Characterization and Measurement; Granular Systems and Bulk Solids Technology; Fluidization and Particle-Fluid Systems; Aerosols; and Applications of Particle Technology.
Key topics concerning the creation and processing of particulates include:
-Modelling and simulation of particle formation, collective behaviour of particles and systems for particle production over a broad spectrum of length scales
-Mining of experimental data for particle synthesis and surface properties to facilitate the creation of new materials and processes
-Particle design and preparation including controlled response and sensing functionalities in formation, delivery systems and biological systems, etc.
-Experimental and computational methods for visualization and analysis of particulate system.
These topics are broadly relevant to the production of materials, pharmaceuticals and food, and to the conversion of energy resources to fuels and protection of the environment.
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