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A strategy of selective and dendrite-free lithium deposition for lithium batteries
2017/11/01
New Publication in “Nano Energy”
Lithium (Li) dendrite alleviation via three-dimensional (3D) structured current collectors has been well studied for Li metal-based batteries. Here we demonstrate that a hollow carbon nanofiber with proper interior to exterior radius ratio can enable Li-ions to deposit on the inner surface of the channels selectively due to the drifting effect from the structural stresses. …
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Graduation in the Division Mechanics of functional Materials
2017/10/16
We congratulate our colleague Yangbin Ma to the successful dissertation of his PhD thesis “Electrocaloric Effect of Ferroelectrics and Relaxors”.
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Voltage-driven charge-mediated fast 180 degree magnetization switching in nanoheterostructure at room temperature
2017/09/22
New Publication in “npj Computational Materials”
Voltage-driven 180° magnetization switching without electric current provides the possibility for revolutionizing the spintronics. We demonstrated the voltage-driven charge-mediated 180° magnetization switching at room temperature by combining firstprinciples calculations and temperature-dependent magnetization dynamics simulation. …
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Lithiation across interconnected V2O5 nanoparticle networks
2017/08/31
New Publication in “Journal of Materials Chemistry A”
Electrochemical reactions within Li-ion batteries occur far from equilibrium and are accompanied by considerable heterogeneity. The sequence and propagation of these phase transformations determine energy dissipation and the proportion of actively intercalating materials, which play a vital role in influencing characteristics such as cyclability, degradation, and hysteresis. …
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Prof. Xu Gave an Invited Talk in the 649. WE-Heraeus-Seminar
2017/08/27
Prof. Xu gave an invited talk in the 649. WE-Heraeus-Seminar “In-operando characterization of energy materials” in Bad Honnef, 23-27 Aug 2017. She spoke about “Multiphysics phase field modeling of electrode materials in Li-ion batteries”.
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Modeling of phase separation across interconnected electrode particles in lithium-ion batteries
2017/08/23
New Publication in “RSC Advances”
Lithium transport and phase separation in and across interconnected electrode particles are investigated in this paper. This paper signifies the influential role of particle size variation on battery performance with phase-separating electrodes. In this work, a model is developed which accounts for lithium transport in the particles, phase separation, and interface reactions across the particle network. …
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Dynamic pull-in instability of a prestretched viscous dielectric elastomer under electric loading
2017/08/16
New Publication in “Acta Mechanica”
The dynamic response of a pre-stretched elastomer membrane under electric loading was analysed. Thereby, two cases of voltage application, constant voltage and an incrementally increased voltage were regarded. The equation of motion (EOM) was derived from the Euler–Lagrange equation and the Rayleigh dissipation function. This allowed to include the influence of prestretch into the evolution equation of the viscous stretch. …
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A study of gradient strengthening based on a finite-deformation gradient crystal-plasticity model
2017/07/22
New Publication in “Continuum Mechanics and Thermodynamics”
A comprehensive study on a finite-deformation gradient crystal-plasticity model which has been derived based on Gurtin’s framework is carried out here. This systematic investigation on the different roles of governing components of the model represents the strength of this framework in the prediction of a wide range of hardening behaviors as well as rate-dependent and scalevariation responses in a single crystal. …
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Multiscale Examination of Strain Effects in Nd-Fe-B Permanent Magnets
2017/07/12
New Publication in “Physical Review Applied”
We perform a combined first-principles and micromagnetic study on the strain effects in Nd-Fe-B permanent magnets. First-principles calculations on Nd2Fe14B reveal that magnetocrystalline anisotropy (K) is insensitive to deformation along the c axis, and that a-b in-plane shrinkage is responsible for K reduction. The predicted K is more sensitive to lattice deformation than the previous phenomenological model suggests. …
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Atomic structure and domain wall pinning in samarium-cobalt-based permanent magnets
2017/07/04
New Publication in “Nature Communications”
A higher saturation magnetization obtained by an increased iron content is essential for yielding larger energy products in rare-earth Sm2Co17-type pinning-controlled permanent magnets. Here we present model magnets with an increased iron content based on a unique nanostructure and -chemical modification route using Fe, Cu, and Zr as dopants. …