This strategy can be further used to understand and control the electrochromic properties of other intercalation-based materials that have multiple different sites for cation intercalation. By using cations that limit intercalation into only select sites, we have shown that we can improve spectral selectivity for NIR light, while still maintaining high transparency in the visible region. This is enabling for smart window technologies that allow for selective blocking of NIR radiation, which leads to excess heat, while still maintaining high transparency for visible light to reduce lighting costs.