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Analytical modeling and simulation of porous electrodes: Li-ion distribution and diffusion-induced stress

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Acta Mechanica Sinica 2018年第1期34卷 187-198页

作者： liang ji Zhansheng Guo Shanghai Institute of Applied Mathematics and Mechanics Shanghai University Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai University

A new model of porous electrodes based on the Gibbs free energy is developed, in which lithium-ion(Liion) diffusion, diffusion-induced stress(DIS), Butler–Volmer(BV) reaction kinetics, and size polydispersity of electrode particles are considered. The influence of BV reaction kinetics and concentration-dependent exchange current density(ECD) on concentration profile and DIS evolution are numerically investigated. BV reaction kinetics leads to a decrease in Li-ion concentration and DIS. In addition, concentrationdependent ECD results in a decrease in Li-ion concentration and an increase in DIS. Size polydispersity of electrode particles significantly affects the concentration profile and *** macroscopic state of charge(SOC) should consider the influence of the microscopic SOC values and mass fractions of differently sized particles.

关键词： New model of porous electrode Butler–Volmer reaction kinetics Size polydispersity Exchange current density Li-ion concentration distribution Diffusioninduced stress

Thermodynamical and Statistical-Mechanical Entropies of the General Static Spherically Symmetric Black Hole

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Chinese Physics Letters 1998年第4期15卷 240-242页

作者： jiNG ji-liang Institute of Physics and Department of Physics Hu’nan Normal UniversityChangsha 410081

The thermodynamical entropy of the general four-dimensional static spherically symmetric black hole is obtained by using the Euclidean path integral approach of Gibbons-Hawking,and its statistical-mechanical entropy is calculated according to the brick wall model of’t *** is shown that the two entropies are not identical in general and the difference between them depends on the area of the horizon and the Ricci scalar curvature on the event horizon.

关键词： entropy curvature Ricci

Quantum Corrections to the Entropy of the Black Hole with a Global Monopole or a Cosmic String

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Chinese Physics Letters 1997年第7期14卷 495-498页

作者： jiNG ji-liang Institute of Physics and Department of PhysicsHunan Normal UniversityChangsha 410081

The quantum corrections to the entropy of the static black holes with a global monopole or a cosmic string are studied by two methods:the brick wall and the Euclidean path *** we ignore the usual contribution from the vacuum surrounding the system,then the two approaches give the same *** quantum corrections for the static black holes consist of two parts:One is quadratically divergent term which takes the geometric *** other is a logarithmically divergent term which is not proportional to the horizon *** renormalization of the quadratically and logarithmically divergent is also investigated.

关键词： correction quadratic logarithmic

Thermodynamics of a Static Dilaton Black Hole

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Chinese Physics Letters 1997年第2期14卷 81-84页

作者： jiNG ji-liang Institute of Physics and Department of Physics Hunan Normal UniversityChangsha 410081

The thermodynamics of a static dilaton black hole is investigated by Euclidean path *** interesting results are obtained:(Ⅰ)Although the temperature,heat capacity and chemical potential have different forms as compared to general classical static charged black hole,the Bardeen-Carter-Hawking thermodynamical laws are valid for the black hole.(Ⅱ)The entropy and area of the event horizon are zero but the energy,temperature and surface gravity are non-zero for extremal case(rh=2M=b).(Ⅲ)The charged black hole does not possess second order phase transitions as the Reissner-Nordstrom black hole since its heat capacity is negative.(Ⅳ)The action is equal to the entropy,and both quantities coincide with one quarter of area of the event horizon.

关键词： horizon black entropy

Electrochemomechanical performance of porous electrode incorporating binder network

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Science China(Technological Sciences) 2019年第8期62卷 1331-1340页

作者： ji liang GUO ZhanSheng ZHANG YuWei Shanghai Institute of Applied Mathematics and Mechanics Shanghai University Shanghai 200072 China Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai University Shanghai 200072 China

This paper proposes a theory for the random generation of porous electrodes to study the electrochemomechanical performance of Li-ion batteries. A new model is developed to explore the effects of the binder network and size polydispersity of electrode particles on the mechanical states under galvanostatic and potentiostatic charging. The quantity of binder, connecting position,contact area, and the angle between the binder and electrode particles exert considerable influence on the electrochemomechanical state of the electrode. Debonding at the interface between the binder and electrode particles is highly likely to occur under galvanostatic charging. Under potentiostatic charging, hoop stress experiences complex compressive-tensile conversion along the interface, which is prone to induce wrinkling and failure of the binder. The model and results are expected to be fundamental to studying real commercial porous electrodes in detail.

关键词： Li-ion battery random generation of porous electrodes binder network electrochemo-mechanical coupling diffusioninduced stress

Stimulus discrimination via responses of retinal ganglion cells and dopamine-dependent modulation

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Neuroscience Bulletin 2013年第5期29卷 621-632页

作者： Hao Li Pei-ji liang School of Biomedical Engineering Shanghai Jiao Tong University

Neighboring retinal ganglion cells（RGCs）fire with a high degree of *** has been increasingly realized that visual perception of the environment relies on neuronal population activity to encode and transmit the information contained in *** how neuronal population activity contributes to visual information processing is essential for understanding the mechanisms of visual *** we simultaneously recorded spike discharges from groups of RGCs in bullfrog retina in response to visual patterns（checkerboard,horizontal grating,and full-field illumination）using a multi-electrode array *** determine the role of synchronous activity mediated by gap junctions,we measured the correct classification rates of single cells＇firing patterns as well as the synchronization patterns of multiple *** found that,under normal conditions,RGC population activity exhibited distinct response features with exposure to different stimulus patterns and had a higher rate of correct stimulus discrimination than the activity of single ***（1μmol/L）application did not significantly change the performance of single neuron activity,but enhanced the synchronization of the RGC population activity and decreased the rate of correct stimulus pattern *** findings suggest that the synchronous activity of RGCs plays an important role in the information coding of different types of visual patterns,and a dopamine-induced increase in synchronous activity weakens the population performance in pattern discrimination,indicating the potential role of the dopaminergic pathway in modulating the population coding process.

关键词： retinal ganglion cells synchronous activity dopamine information coding

Propagation and Evolution of a Scalar Field in Einstein-Power-Maxwell Spacetime

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Chinese Physics Letters 2012年第1期29卷 31-34页

作者： LIU Yan jiNG ji-liang Department of Physics and Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of EducationHunan Normal UniversityChangsha 410081

The propagation and dynamical evolution of a scalar field in the background of a(2+1)-dimensional Einstein–Power–Maxwell(EPM)black hole are *** obtain an analytical expression for the greybody factor,which shows that the greybody factor increases as the electric charge increases and approaches unity for large *** also find the quasinormal modes of the black hole,which tell us that the EPM spacetime is very stable.

关键词： Maxwell black Power

Late-Time Evolution of the Phantom Scalar Perturbation in the Background of a Spherically Symmetric Static Black Hole

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Chinese Physics Letters 2010年第6期27卷 9-12页

作者： PAN Qi-Yuan jiNG ji-liang Institute of Physics and Department of Physics Hunan Normal University Changsha 410081

The late-time evolution of the phantom scalar perturbation is investigated in the spacetime of a four-dimensionai spherically symmetric static black hole. It is revealed that the asymptotic tail of the phantom scalar field is dominated by the growth behavior t-（l＋3/2）eμt, which depends on the multipole moment l and the field moss but is independent of the mass M and charge Q of the black hole. This growth behavior is in strong contrast to the decaying tall of the usual massive scalar perturbation and shows that the external phantom scalar perturbation is unstable in the spherically symmetric static black hole spacetime.

关键词： Limonium sinuatum Growth Tail Fields

New Fabrication and Mechanical Properties of Styrene-Butadiene Rubber/Carbon Nanotubes Nanocomposite

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Journal of Materials Science & Technology 2010年第12期26卷 1127-1132页

作者： Xiangwen Zhou Yuefeng Zhu ji liang Suyuan Yu Key Laboratory for Advanced Materials Processing Technology Ministry of Education Department of Mechanical Engineering Tsinghua University Beijing 100084 China Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China

A novel technology to prepare styrene-butadiene rubber （SBR）/carbon nanotubes （CNTs） composites was developed by combining a spray drying method and a subsequent mechanical mixing process. The cross-linking degrees of the vulcanized composites increased gradually with the additive CNTs contents. By comparing with those of the pure SBR composites, the mechanical properties such as tensile strength, tear strength and hardness of the composites filled with CNTs at certain contents were dramatically improved almost by 600%, 250% and 70%, respectively. The fabrication of the CNTs filled with SBR composites by combination of the spray drying method and subsequent mechanical mixing process was effective for enhancing the reinforcement effects of CNTs in rubbers. The novel technology can also open a new route for the modification and reinforcement on the nanocomposites with large amount of CNTs.

关键词： Carbon nanotubes Styrene-butadiene rubber Spray drying Mechanical mixing Nanocomposite Mechanical property