 This research has developed a new type of interface for solid state lithium metal batteries, which can increase their efficiency and stability. The interface consists of a 3D Burr microsphere layer made up of ionic conductors, which allows for easy infiltration of molten lithium into the battery. This results in a high rate of charge and discharge, as well as improved stability over time. Additionally, this interface is able to reduce the contact resistance between the electrodes, resulting in higher energy densities and longer cycle lives. This article was authored by Buttian Chen, Ji Cheng Zhang, Tianran Zhang, and others.