Solid-state silicon battery

A solid-state silicon battery or silicon-anode all-solid-state battery is a type of rechargeable lithium-ion battery consisting of a solid electrolyte, solid cathode, and silicon-based solid anode.

In solid-state silicon batteries, lithium ions travel through a solid electrolyte from a positive cathode to a negative silicon anode. Silicon anodes for lithium-ion batteries have been studied and are already starting to appear in the market. Developments in 2021 showed that solid-state silicon lithium-ion batteries are possible, and offer many of the hypothesized benefits. Solid electrolytes more easily interface with the anode. These batteries are different from other solid-state batteries due to their use of silicon instead of less energy-dense materials.

Silicon is difficult to work with because it expands over 300% during lithiation (also known as lithium intercalation). This contributes to the other major difficulty: lithium loss due to a buildup within the battery.