NOVELTY - A battery cell (2) comprises a housing (1), a positive electrode (4), a negative electrode (5) and an electrolyte, where the electrolyte comprises sulfur dioxide (SO2) and a conductive salt, where the positive electrode comprises lithium transition metal fluoro silicate/sulfonate/phosphate compound, where the positive electrode further comprises a current collector having a first portion comprising a porous metal which has a first and second surface and a thickness located between them and comprises pores containing the compound that extend at least partially through the thickness.    USE - As a battery cell, particularly lithium ion battery cell used in motor vehicle power supply, and in an energy storage system (claimed).    ADVANTAGE - The battery cell is a rechargeable lithium ion battery cell; has reduced manufacturing cost; is not flammable and not combustible; and has improved cell cycle stability over multiple cycles.    DETAILED DESCRIPTION - A battery cell comprises a housing, a positive electrode, a negative electrode and an electrolyte, where the electrolyte comprises SO2 and a conductive salt, where the positive electrode comprises a compound of formula LixM'y(XO4)a(F)b (I), which compound is optionally doped (where M' is at least one of Ti, V, Cr, Mn, Fe, Co, Ni, Cu or Zn, X is P, Si or S;#x, y and a=greater than 0;#b= greater than or equal to 0), where the sum of positive charges in the compound equals the sum of negative charges, where the positive electrode further comprises a current collector having a first portion comprising a porous metal which has a first and second surface and a thickness located between them and comprises pores containing the compound that extend at least partially through the thickness, where at least some of the pores have void spaces accessible to the electrolyte and where the battery cell is a rechargeable lithium ion battery cell. An INDEPENDENT CLAIM is included for producing a positive electrode for a lithium ion rechargeable battery, involving providing a paste mass comprising lithium iron phosphate (LiFePO4), optionally with mixture of a binding agent or a conductivity-improving material; homogeneously incorporating the paste mass into a three-dimensional porous metal current collector; and pressing the three-dimensional metal current collector comprising the paste mass in such a manner that its thickness is reduced.    DESCRIPTION OF DRAWING(S) - The figure shows a cross-sectional view of a battery cell.    Housing (1)    Battery cell (2)    Positive electrode (4)    Negative electrode (5)    Separator (11)