Silicon Anodes for High Energy Density Lithium-Ion Batteries

Amprius Technologies is a pioneer and the established leader in the production of silicon anodes for high energy density lithium-ion batteries. The company has developed new manufacturing methods for producing 100% silicon anodes based on a proprietary nanowire structure. The nanowire structure overcomes the inherent swelling associated with silicon lithiation. By depositing a porous silicon coating over with well-spaced nanowire templates, Amprius enabled both microscopic as well as macroscopic solutions, respectively, to the swelling problem. As a result, cells containing Amprius' silicon nanowire anode ultra-high energy density and long cycle life. Setting a precedent for scalable silicon anode production, Amprius Technologies developed a unique manufacturing tool that employs a multi-step process to fabricate 3D structures on a moving foil in a fully integrated roll-to-roll system. This roll-to-roll design supports the web in a free-span transport system that contactless conveys it through the sequential processes. Amprius Technologies’ batteries are currently designed into High Altitude Pseudo-Satellites (HAPS), advanced drones, and wearables. Batteries are in development for electric and autonomous vehicles.