Solid-state lithium batteries are a tantalizing technology for their high-energy density and safety benefits; however, in their current form, they can short and catch fire due to the growth of dendrites between the anode and cathode. Now, by embedding the anode with silicon particles, Harvard University materials scientists were able to control dendrite growth, preventing lithium ions from penetrating beyond the anode's shallow surface. This design allows the battery to withstand a high current density and multiple charge-discharge cycles.