Patent ID: 8582193

Claim:
An electrochromic device comprising: (a) an electrochromic layer comprising an electrochromic material; (b) a counter electrode layer comprising a counter electrode material; and (c) an interfacial region between the electrochromic layer and the counter electrode layer, wherein the interfacial region comprises a mixture of: (i) a substantially electronically insulating ion conducting material, and (ii) at least one of the electrochromic material, the counter electrode material and an additional material, where the additional material includes distinct electrochromic or counter electrode material, wherein the electrochromic material undergoes a first electrochromic transition when exposed to a potential of magnitude sufficient to drive the first electrochromic transition, and wherein the counter electrode material undergoes a second electrochromic transition when exposed to a potential of magnitude sufficient to drive the second electrochromic transition, and wherein at least one of the electrochromic material and the counter electrode material contains lithium.