Yang-Tse Cheng

TL;DR: In this article, a combined experimental and theoretical investigation of phase separation and microstructure development in co-deposited Al-Ge thin films is presented, showing that the domain structure evolves during deposition in a manner consistent with a surface interdiffusion controlled process.

TL;DR: In this article, the relationship between hardness and cone angle of conical indenters was studied using finite element analysis for elastic-plastic solids with work-hardening, and compared with the present simulation results, slip line theory, and experimental results.

Abstract: The life and performance of lithium-ion batteries are related to the mechanical expansion and contraction of the active materials, particularly for silicon-enhanced negative electrodes. In this work, we develop a theory and commensurate equations to describe how lithium diffuses within lithiated silicon, and we include the influence of active material expansion (upon lithiation) and contraction (upon delithiation). The treatment of diffusion is based on irreversible thermodynamics, and a charge-transfer relationship is employed at the electrode–electrolyte interface. The experimental approach allows us to isolate our analysis to the active material and avoids the necessity of treating binders, conductive diluents, and complicated geometries associated with conventional porous electrodes used in most practical lithium-ion batteries and in the construction and modeling of a Li–Si porous electrode. The model is shown to compare favorably with experimental results. The final section of this paper addresses si...

TL;DR: In this article, a robust electrochemical-mechanical coupled numerical procedure was developed to investigate the influence of large plastic deformation and interfacial failure on the measured stress in thin film electrodes.

TL;DR: In this paper, the effect of counterface material on the tribological behavior of non-hydrogenated diamond-like carbon (DLC) coatings in air (29% RH) and an inert atmosphere (argon) was investigated.