Mechanical Engineering Commons^™

Laser Direct Written Silicon Nanowires For Electronic And Sensing Applications, Woongsik Nam

Open Access Dissertations

Silicon nanowires are promising building blocks for high-performance electronics and chemical/biological sensing devices due to their ultra-small body and high surface-to-volume ratios. However, the lack of the ability to assemble and position nanowires in a highly controlled manner still remains an obstacle to fully exploiting the substantial potential of nanowires. Here we demonstrate a one-step method to synthesize intrinsic and doped silicon nanowires for device applications. Sub-diffraction limited nanowires as thin as 60 nm are synthesized using laser direct writing in combination with chemical vapor deposition, which has the advantages of in-situ doping, catalyst-free growth, and precise control of position, …

High-Throughput Mechanical Characterization Methods For Composite Electrodes And In-Situ Analysis Of Li-Ion Batteries, Luize Scalco De Vasconcelos

Open Access Theses

Electrodes in commercial rechargeable batteries are microscopically heterogeneous materials. The constituents often have large variation in their mechanical properties, making the characterization process a challenging task. In addition, the mechanical properties and mechanical behaviors of electrodes are closely coupled with the electrochemical processes of lithium insertion and extraction. There is an urgent need to develop an experimental platform to characterize the chemomechanical response of electrodes under the in-situ conditions of charge and discharge.

In the first part of this thesis, instrumented grid indentation is employed to determine the elastic modulus and hardness of the constituent phases of a composite cathode. …

Design And Optimization Of Lithium Ion Battery For High Temperature Applications, Khalid Abdullitife Ababtain

Wayne State University Dissertations

With massive commercial success of lithium ion batteries, the ability to operate at

and above 70 °C still a crucial issue and a safety concern to combat ever-increasing

global warming and to extend applications beyond portable electronics. Among various

components of battery, anode and electrolyte and the passivation layer formed between

them is crucial towards the development of Li-ion batteries for extendable temperature

range. In this regard, room temperature ionic liquids (RTILs) have the capability to

tackle thermal stability issues of lithium ion batteries but their poor compatibility with

traditional graphite anodes limits their practical application. Towards addressing this

issue, …