Fab to build miniature solid state batteries

Fab to build miniature solid state batteries

Business news |
By Nick Flaherty

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French startup InjectPower is looking to set up a fab to build its miniature rechargeable solid state batteries for medical applications.

The 1mm2 solid state batteries

The company has developed a miniature solid state rechargeable lithium ion battery technology that can be used in implanted devices. The battery cells are 0.1mm thick with a footprint of 1mm2. The key is that the batteries can be built on a 200mm wafer process with deposition, etch and passivation, and the company is currently looking for a site for a cleanroom to be up and running in 2026. 

The prototype devices have been made on the 200mm pilot line at Leti in Grenoble, showing an energy density of 250Wh/l. This currently  has a yield of 50%, although the new cleanroom would see the yield increasing to 80- to 90%. A single 200mm wafer would produce 10,000 of the batteries, so a few hundred wafers would supply the predicted demand.

As a result the company has worked with US startup InjectSense which has developed a MEMEs pressure sensor, controller ASIC and wireless charging chip. These would be combined with the batteries for long-term monitoring of intra-ocular pressure (IOP) in the eyeball. This assesses the effectiveness of glaucoma treatments.

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