Fundamentals of Laser Direct Write Deposition for Electrochemically Active Materials Craig B. Arnold, Mechanical and Aerospace Engineering, Princeton Institute of Science and Technology of Materials, Princeton University, Princeton, NJ 08544 LDW is an important way to create patterns of active material for small scale energy storage systems Schematic of LDW printing Laser Camera Objective Ink Donor substrate Receiver substrate XYZ CAD/CAM stage We demonstrate that this technique can be used to optimize material properties during printing leading to higher capacity and improved high rate behavior 25 mJ laser No laser Proton limited Near ideal Electron limited In contrast to traditional methods of materials processing, LDW processing enables improved electron transport with minimal decrease proton reaction kinetics