The microstructure of electrodes is intrinsically complex and thus should be determined prior to the analysis of the chemo-mechanical performance during charge/discharge cycles. In this study, a microstructurally resolved, fully coupled chemo-mechanical model was developed to investigate the structure–property relationship of electrodes in the framework of elastoplastic finite deformation.
The interfacial peeling strength of lithium-ion battery electrodes is a very important mechanical property that significantly affects the electrochemical performance of battery cells.
To characterize the interfacial peeling strength of an electrode, an analytical model based on the energy balance principle is established by considering the state of charge (SOC), the energy release rate, the tensile stiffness, and the peeling angle.
The loss of connectivity in particle-based LiMO2 (M = Ni, Co, Al, and/or Mn) electrodes due to mechanical failure
and fracture at the interface between primary particles is one of the major causes of capacity fading in Li-ion
batteries (LIBs) after certain electrochemical cycles. In this study, a model of a secondary particle composed
of randomly distributed primary particles is established using a fractal algorithm. The finite element method
with cohesive crack modeling is employed to simulate the intraparticle fracture within the secondary particle.
In this paper, a new reaction-diffusion model, coupling the reversible electrochemical reaction, Lithium (Li) diffusion, and bending, is proposed to investigate the curvature, neutral axis movement, and stress in bilayer electrode. Bending curvature and stress, for the first time, are analytically and numerically investigated relate to both the diffusion and the reversible electrochemical reaction. The results reveal that the reversible electrochemical reaction retards the lithiation process, leading to the slowing down of diffusion process.
A multiscale model of porous electrodes based on the Gibbs free energy is developed, in which the Li ion diffusion, diffusion-induced stress (DIS), and polydispersities of electrode particle sizes are considered. The relationships between the size polydispersities and the concentration profiles and DIS evolution are investigated numerically. Li ion distributions are verified by in situ observation of color changes in a commercial porous graphite electrode.
Polymer–metal–polymer composite films are widely used in packaging, building, and cooling, and more recently as envelopes for pouch lithium-ion batteries (LIBs). The influences of heat seal temperature and dwell time on the heat seal strength (HSS) of five different multilayer films were investigated by T-peel testing. The failure modes were observed and analyzed by digital optical microscopy. Heat-sealing temperature and dwell time interacted and simultaneously influenced the HSS. Temperature was confirmed as the primary factor while dwell time was secondary.
Temperature-dependent
modulus of glass fiber/epoxy composite laminates were studied at temperatures
ranging from room temperature up to 120℃. The storage modulus, loss
modulus, loss factor, and glass transition temperature of two layer-up composite
laminates were investigated by dynamic mechanic analysis (DMA). Static flexural
modulus was also measured by control force mode in DMA. A new and simple temperature-dependent
model both for the dynamic storage modulus and static flexural modulus was developed.
The 3rd International Conference on Heterogeneous Material Mechanics which will be held on May 22-26, 2011 at Shanghai.
This is a reminder for abstract submission deadline: November 15 2010.
Committees
A.
Co-Chairs and Scientific Committee
Co-Chairs
First Announcement and Call for Papers
ICHMM-2011
The 3rd International Conference on Heterogeneous Material Mechanics
May 22-26, 2011
Shanghai (Chong Ming Island), CHINA
http://ichmm2011.shu.edu.cn
Co-Chairs
D.L.
McDowell, Georgia
Institute of Technology
david.mcdowell [at] me.gatech.edu
