Patent ID: 7622224

Claim:
Lithium storage cell comprising at least a first electrode comprising an active material wherein Li + cations can be inserted, a second electrode and an electrolyte, wherein the active material comprises a linear condensed compound comprising at least two tetrahedra, respectively of AO 4 and A′O 4 type, bonded by a common oxygen atom and wherein an M 2+ ion of transition metal with a degree of oxidation of +2 is inserted, the ratio between the number of Li + cations able to be inserted in the active material and the number of transition metal ions M 2+ being strictly greater than 1, A and A′ being selected from the group consisting of P 5+ , Si 4+ , Al 3+ , S 6+ , Ge 4+ , B 3+ and M 2+ being selected from the group consisting of Ni 2+ , Co 2+ , Mn 2+ , Fe 2+ and Ti 2+ , wherein the active material has the following general formula (I): Li a X b MZ d (A 2 O 7 ) e (A′O 3 ) f (I) in which: X represents at least one alkaline metal with a degree of oxidation of +1 selected from the group consisting of Li + , Na + , K + , M represents at least one transition metal with a degree of oxidation of +2 selected from the group consisting of Ni 2+ , Co 2+ , Mn 2+ , Fe 2+ , Ti 2+ , Z represents at least one element selected from the group consisting of the metal ions Cu + , Ag + , Mg 2+ , Ca 2+ , Sr 2+ , Zn 2+ , V 2+ , Cu 2+ , Al 3+ , Ti 3+ , Cr 3+ , Fe 3+ , Mn 3+ , Ga 3+ , V 3+ , Ge 4+ , Sn 4+ , Mo 4+ , Ti 4+ , V 4+ , V 5+ , Ta 5+ , Nb 5+ and Mo 6+ , the chemical elements O, S, F and Cl and a group of A″O 4 type, A″ is a cation selected from the group consisting of P 5+ , Si 4+ , Al 3+ , S 6+ , Ge 4+ , B 3+ , a>1, b and d≧0 and e and f>0.