Ultra‐Lightweight, High Power Density Lithium‐Ion Batteries

Current fabrication methods for lithium‐ion batteries impose a limit on how light a high power battery can be made. The lack of lightweight (1 kW/kg). Our process is versatile and can be adapted to make custom geometries, miniature high voltage cells, and more, all while using a broad range of starting materials. We see this technology as a path to highly versatile miniature power sources, that will enable a wide range of small‐scale applications. Easy like a feather in the wind! A laser micro‐machining and assembly process for the fabrication of ultra‐lightweight lithium‐ion micro batteries is developed. The image shows an example of a high power density battery (>1 kW/kg). The active materials cover 2 cm×1 cm and the battery weighs less than 140 mg after electrolyte addition and heat sealing.