3D-microbattery architectural design optimization using automatic geometry generator and transmission-line model

Summary Optimization of the 3D battery architecture is crucial to improve the performance of microbatteries. However, such optimization is difficult and time-consuming by hand for even experts. In this paper, we propose a battery optimization system, which consists of an automatic geometry generator and performance simulators. The geometry generator creates feasible 3D batteries without using any human intuition and experience for the spatial arrangement of positive and negative electrodes. For quick evaluation of the internal resistance, which relates power and energy densities, we propose the transmission line model, the so-called 3D porous electrode model, as one of the performance simulators. To show the effectiveness of the optimization system, we designed the lithium-ion microbatteries. In the tradeoff frontier for the internal resistance and the capacity, we successfully found a new battery architecture that has higher power and energy densities over the conventional interdigitated plates configuration.