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Abstract

An electrochemical cell comprises as an anode, a lithium transition metal oxide or sulphide compound which has a [B.sub.2]X.sub.4.sup.n-spinel-type framework structure of an A[B.sub.2]X.sub.4 spinel wherein A and B are metal cations selected from Li, Ti, V, Mn, Fe and Co, X is oxygen or sulphur, and n- refers to the overall charge of the structural unit [B.sub.2]X.sub.4 of the framework structure. The transition metal cation in the fully discharged state has a mean oxidation state greater than +3 for Ti, +3 for V, +3,5 for Mn, +2 for Fe and +2 for Co. The cell includes as a cathode, a lithium metal oxide or sulphide compound. An electrically insulative lithium containing liquid or polymeric electronically conductive electrolyte is provided between the anode and the cathode.

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First Claim