Experiment and simulation of the fabrication process of lithium-ion battery cathodes for determining microstructure and mechanical properties

被引:99
作者
Forouzan, Mehdi M. [1 ]
Chao, Chien-Wei [1 ]
Bustamante, Danilo [2 ]
Mazzeo, Brian A. [2 ]
Wheeler, Dean R. [1 ]
机构
[1] Brigham Young Univ, Dept Chem Engn, Provo, UT 84602 USA
[2] Brigham Young Univ, Dept Elect & Comp Engn, Provo, UT 84602 USA
关键词
Li-ion cathode; Particle dynamics simulation; Microstructure prediction; Slurry viscosity; Electrode elasticity; ELECTROCHEMICAL PERFORMANCE; CONDUCTIVE ADDITIVES; POLYMERIC BINDER; NEMD SIMULATIONS; PARTICLE-SIZE; ELECTRODE; MORPHOLOGY; MODEL; EVOLUTION; VISCOSITY;
D O I
10.1016/j.jpowsour.2016.02.014
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The fabrication process of Li-ion battery electrodes plays a prominent role in the microstructure and corresponding cell performance. Here, a mesoscale particle dynamics simulation is developed to relate the manufacturing process of a cathode containing Toda NCM-523 active material to physical and structural properties of the dried film. Particle interactions are simulated with shifted-force Lennard-Jones and granular Hertzian functions. LAMMPS, a freely available particle simulator, is used to generate particle trajectories and resulting predicted properties. To make simulations of the full film thickness feasible, the carbon binder domain (CBD) is approximated with mu m-scale particles, each representing about 1000 carbon black particles and associated binder. Metrics for model parameterization and validation are measured experimentally and include the following: slurry viscosity, elasticity of the dried film, shrinkage ratio during drying, volume fraction of phases, slurry and dried film densities, and microstructure cross sections. Simulation results are in substantial agreement with experiment, showing that the simulations reasonably reproduce the relevant physics of particle arrangement during fabrication. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码:172 / 183
页数:12
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