Monday, 20 June 2016
Riverside Center (Hyatt Regency)
The adhesion of anode and electrode materials to such substrates as current collectors and solid electrolytes is an important area of research. Many potential anode and cathode materials such as SnO2 and sulfur expand as much as 300% with the intercalation of lithium. Thus understanding adhesion mechanisms can result in better functioning electrode systems and could allow new electrode materials to be used. Recently, a procedure for producing nano-scale batteries using a nano-porous alumina membrane has been developed. This battery structure consists of thin film anodes and cathodes deposited on top of the electrolyte-filled nanoporous membrane. At the moment, the interfacial strength of the anode/substrate and the cathode/substrate bond has not been studied and this battery configuration presents an ideal system for adhesion studies. In the present work, the strength of this adhesion is investigated using the novel method of laser spallation. This approach allows for the investigation of the interface adhesion strength without the complication of mechanical loading techniques. For the experiments presented, a model substrate loaded by laser spallation and the interfacial strength of the substrate-cathode bond is investigated as a function of cycling history and processing parameters. Understanding the role of process parameters like deposition condition and design parameters such as substrate thickness and film thickness, on mechanical performance of the layer is essential in optimizing manufacturing.