| abstract |
A lithium insertion compound having the following formula (I): LiαMβM1vM2wM3xM4yM5zBy (XO4-ε Zε) 1 (I) - M is selected from V2 +, Mn2 +, Fe2 +, Co2 + and Ni2 +; M1 is selected from Na + and K +; M2 is selected from Mg2 +, Zn2 +, Cu2 +, Ti2 + and Ca2 +; M3 is selected from Al3 +, Ti3 +, Cr3 +, Fe3 +, Mn3 +, Ga3 + and V3 +; M4 is selected from Ti4 +, Ge4 +, Sn4 +, V4 + and Zr4 +; M5 is selected from V5 +, Nb5 +, and Ta5 +; X is an element in the oxidation state m exclusively resident in a tetrahedral site and coordinated by oxygen or a halogen, which is selected from B3 +, Al3 +, V5 +, Si4 + , P5 +, S6 +, Ge4 + and mixtures thereof - Z is a halogen selected from F, Cl, Br and I. - The coefficients α, β, v, w, x, y, z, y and ε are all positive and satisfy to the following relations: - 0 ≤ α ≤ 2 (1) - 1 ≤ β ≤ 2 (2) - 0 <γ (3) - 0 ≤ α ≤ 2 (3) - 0 ≤ ε ≤ 2 (4) Α + 2β + 3γ + v + 2w + 3x + 4y + 5z + m = 8 - ε (5); and-- Processes for preparing these compounds.Associated materials of electrodes, in particular positive electrodes containing said compounds, and accumulators and electrochromic devices employing these compounds. |