With the rapid growth of the Internet of Things, the key trends in microelectronics are clear - miniaturization, flexibility, and integration are leading the way. Various microelectronic devices, including wearables, implants, micro-robots, and micro-sensors, have made significant advances and are set to become essential parts of our everyday lives. These tiny devices excel in complex tasks such as data processing and wireless signal transmission, paving the way for major innovations in areas like health monitoring, medical diagnosis, and disease treatment. However, powering these devices seamlessly requires an efficient energy supply unit. Our research is dedicated to developing microscale batteries, known as micro-batteries, with a special focus on 3D electrode designs to boost energy storage performance within the limited space of microscale devices. We particularly emphasize planar device configurations, which organize electrodes in an interdigitated electrode (IDE) pattern on the same substrate, resulting in a flat, efficient structure. This design offers significant benefits, such as improved control over critical battery properties like internal resistance and ionic diffusion distance, all without needing a separator. Most importantly, it provides a practical solution for reducing battery size and integrating them seamlessly with on-chip microelectronic devices. The processing and precise loading of energy materials onto microelectrodes are critical to optimizing charge storage performance. Our research centers on designing advanced 3D current collectors and utilizing electrodeposition and Microplotter techniques to specifically and selectively manipulate energy materials on these collectors.