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Data-Driven State of Health Estimation for Lithium-Ion Batteries Based on Universal Feature Selection

A simple yet effective health indicator (HI)-based data-driven model forecasting the state of health (SOH) of lithium-ion batteries (LIBs) and thus enabling their efficient management is developed. Five HIs with high physical significance and predictive power extracted from voltage, current, and temperature profiles are used as model inputs. The generalizability and robustness of the proposed ridge regression–based linear regularization model are assessed using three NASA datasets containing information on the behavior of batteries over a wide range of temperatures and discharge rates.

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Elastoplastic model for chemo-mechanical behavior of porous electrodes using image-based microstructure

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.

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Li-ion distribution and diffusion-induced stress calculations of particles using an image-based finite element method

The realistic particles in lithium batteries have unique microstructures, which should be determined in the analysis of chemo-mechanical behaviors during charge/discharge cycles. In this paper, an image-based finite element method (IBFEM) is developed to investigate the volume expansion, Li-ion distribution, and diffusion-induced stress (DIS) of a realistic particle.

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Analytical Model and Experimental Verification of the Interfacial Peeling Strength of Electrodes


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.


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Simulation of crack behavior of secondary particles in Li-ion battery electrodes during lithiation/de-lithiation cycles

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

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Stress induced by diffusion, curvature, and reversible electrochemical reaction in bilayer lithium-ion battery electrode plates

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.

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Computational and Experimental Observation of Li-Ion Concentration Distribution and Diffusion-Induced Stress in Porous Battery Electrodes

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.

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Heat seal properties of polymer–aluminum–polymer composite films for application in pouch lithium-ion battery

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.

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A New Temperature-dependent Modulus Model of Glass/Epoxy Composite at Elevated Temperatures

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.

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Reminder from the 3rd International Conference on Heterogeneous Material Mechanics (ICHMM-2011)

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.   


Co-Chairs and Scientific Committee

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The 3rd International Conference on Heterogeneous Material Mechanics-First Announcement and Call for Papers

First Announcement and Call for Papers
The 3rd International Conference on Heterogeneous Material Mechanics
May 22-26, 2011
Shanghai (Chong Ming Island), CHINA


, Georgia
Institute of Technology

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a book about self healing materials

recommend more references about this topic: S. van der Zwaag Editor, Self Healing Materials-An Alternative Approach to 20 Centuries of Materials Science. Springer, 2007.  about half of this book talk self healing polymers.

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Professor Zhigang will give lectures at Tongji University, Shanghai China

from the prof. Ying Dai:

Prof. Zhigang will give two lectures on 1:45pm, 29 May, 2008 at Tongji University, Shanghai China.

Position is the second floor meeting room of Run Run Shaw building.

 1. from Learning Harvard University to The National Academy of Engineering (NAE) of American

2.  Mechanics of Soft Active Materials

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why just show the comment title and not show the body

why just show the title of the comment and the body is missing 

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ICNM 2007

The International Conferences on Nonlinear Mechanics (ICNM-x) have been regarded as important series conferences in mechanics circles. The previous four meetings in the series were successfully held in Shanghai and Beijing in 1985, 1993, 1998 and 2002, respectively. In recent years, new achievements in this field have been made. Therefore, it is appropriate to organize a new conference on this vitally important area of applied mathematics and mechanics. The Fifth International Conference on Nonlinear Mechanics (ICNM-V) will be held in Shanghai. The Conference aims to provide an international forum for presenting the latest results and stimulating wider academic exchange for experts in the related fields all over the world.

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