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Pressure-sensitive plasticity of lithiated silicon in Li-ion batteries

Acta Mechanica Sinica 2013年第3期29卷 379-387页

作者： Ke-Jie Zhao Yong-Gang Li laurence brassart Department of Nuclear Science and Engineering and Materials Science and Engineering Massachusetts Institute of Technology Key Laboratory for Materials Physics Institute of Solid State Physics Chinese Academy of Sciences Institute of Mechanics Materials and Civil Engineering Université catholique de Louvain

Lithiation-induced plasticity is a key factor that enables Si electrodes to maintain long cycle life in Li-ion batteries. We study the plasticity of various lithiated sili-con phases based on first-principles calculations and iden-tify the linear dependence of the equivalent yield stress on the hydrostatic pressure. Such dependence may cause the compression-tension asymmetry in an amorphous Si thin film electrode from a lithiation to delithiation cycle, and leads to subsequent ratcheting of the electrode after cyclic lithiation. We propose a yield criterion of amorphous lithi-ated silicon that includes the effects of the hydrostatic stress and the lithiation reaction. We further examine the micro-scopic mechanism of deformation in lithiated silicon under mechanical load, which is attributed to the flow-defects mediated local bond switching and cavitation. Hydrostatic compression confines the flow defects thus effectively strength-ens the amorphous structure, and vice versa.

关键词： Li-ion batteries · Si · Pressure-sensitive plasticity · Ratcheting.

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An explicit formulation of the macroscopic strength criterion for porous media with pressure and Lode angle dependent matrix under axisymmetric loading

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第4期13卷 820-832页

作者： Jincheng Fan laurence brassart Wanqing Shen Xiurun Ge Institute of Deep Earth Sciences and Green Energy College of Civil and Transportation EngineeringShenzhen UniversityShenzhen518060China School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai200240China Department of Engineering Science University of OxfordOxfordOX13PJUK Department of Materials Science and Engineering Monash UniversityClaytonVIC3800Australia Univ.Lille CNRSCentrale LilleUMR 9013-LaMcube-Laboratoire de MecaniqueMultiphysiqueMulti-echelle59000LilleFrance

This paper aims to propose an explicit formulation of the macroscopic strength criterion for porous media with spherical *** matrix is assumed rigid and perfectly plastic with yield surface described by the three-parameter strength criterion,which is Lode angle and pressure dependent and capable of accounting for distinct values of the uniaxial tensile strength,uniaxial compressive strength(UCS)and equal biaxial compressive strength(eBCS).An exact upper bound of the macroscopic strength is derived for porous media subjected to purely hydrostatic ***,an estimate of the macroscopic strength profile of porous media under axisymmetric loading is obtained in parametric ***,a heuristic strength criterion in explicit form is further developed by examining limit cases of the parametric strength *** developed strength criteria are assessed by finite-element based numerical *** with the parametric strength criterion which involves cumbersome functions,the heuristic one is convenient for practical *** specific values of the matrix’s strength surface,the proposed heuristic strength criterion can recover the well-known Gurson *** present work also addresses the effect of the ratio of matrix’s eBCS to UCS on the macroscopic strength of porous *** matrix with distinct values of eBCS and UCS,neglecting the difference between eBCS and UCS would result in an underestimation of the macroscopic strength,especially when the pressure is large.

关键词： Porous materials Unified strength criterion Homogenization Gurson criterion

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