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Electrochromic devices including a mica layer electrolyte

  • US 4,416,517 A
  • Filed: 02/18/1982
  • Issued: 11/22/1983
  • Est. Priority Date: 12/22/1980
  • Status: Expired due to Fees
First Claim
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1. A electrochromic device comprising at least one solid inorganic electrochromic layer, a solid electrolyte layer in contact with the electrochromic layer which is permeable to cations but substantially impermeable to electrons, and electrode means for applying an electrical potential across the electrolyte and electrochromic layers, characterized in that the solid electrolyte layer comprises polycrystalline mica, the mica crystals in the layer not exceeding about 20 microns in their largest dimension and containing at least one species of exchangeable interlayer cation selected from the group consisting of Na+, Li+ and H+.

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