One-dimensional structure pre-calciated materials as positive electrode for rechargeable calcium batteries and cell comprising the same

The present invention relates to a calcium-based secondary cell containing:an electrolyte arranged between the negative electrode and the positive electrode and comprising a calcium salt of a fluorine-containing anion of formula (XFn)m− wherein n is a positive integer of at most 6 and m is a positive integer of at least 1 and ma positive-electrode active material at the positive electrode which is a one-dimensional structure accommodating Ca2+ ions and has the formula (1): Can+2Me1(n+1)−y−zMe2yMe3zO3n+3 (1) wherein:Me1, Me2, Me3 are different transition metals;1≤n and n is not necessarily an integer;0≤y and y is not necessarily an integer;0≤z and z is not necessarily an integer.Peer reviewedToyota Motor Europe, Consejo Superior de Investigaciones Científicas (España)A1 Solicitud de patente con informe sobre el estado de la técnic