Author Dr. Simon Madgwick of Nuvvon Inc.
In yet another breakthrough Nuvvon has used its Solid Polymer Electrolyte (SPE) to combine a high silicon anode with a high nickel cathode. See below data set for 1Ah 40% silicon graphite vs NMC 811.
Crucially, the SPE is able to accommodate traditional expansion issues associated with high silicon, without the need for external compression. This means Nuvvon can offer superior Power Density and very cold temperature performance with Silicon anodes, alongside superior Energy Density with Lithium anodes.
The data is at ambient pressure and room temperature, except for the low temperature testing (which is also at ambient pressure):
- Fast C-rate at 3C charge and 3C discharge with >95% capacity
- Very low temperature performance including >60% capacity at -40°C
- Note the cells cycle smoothly for hundreds of cycles after -60°C exposure and 3C/3C rate testing (200 cycles 1C/1C at RT with 90% retained capacity)
To be clear, these cells are completely solid state (no liquids, solid catholyte, solid anolyte), zero external pressure, great VED and GED as previously reported, and the cells are standard cells made on a standard process. Nuvvon believes this is unique and outperforming.
Next up, Nuvvon will share 5Ah and 20Ah Gr-NMC811 cells cruising at >1000 cycles 1C/1C with 95% capacity retention, plus 3C/5C charge/discharge (all room temperature and zero compression) and low temperature cycling at -25°C with 75% capacity retention (also zero compression).