Electrochemical Cell

An electrochemical cell comprising:

• as at least part of an anode, a lithium transition metal oxide compound which has a [B2]X4n− spinel-type framework structure of an A[B2]X4stochiometric spinel or defect spinel, wherein A comprises Li, B comprises Li and Ti, X is oxygen (O), and n− refers to the overall charge of the structural unit [B2]X4n− of the framework structure, and the transition metal cation of which in the fully discharged state of the cell has a mean oxidation state of +4 for Ti;
• as at least part of a cathode, a compound with a structure type other than a lithium-metal-oxide compound;
• and
• an electrically insulative, lithium containing, liquid or polymeric, ionically conductive electrolyte between the anode and the cathode, such that, on discharging the cell, lithium ions are extracted from the spinel-type framework structure of the anode, with the oxidation state of the metal ions of the anode thereby increasing, while a concomitant insertion of lithium ions into the compound of the cathode takes place, with the oxidation state of the metal ions of the cathode decreasing correspondingly.