Nonrechargeable thin-film batteries having anionically functionalized polymers as separators

The present invention relates to a thin-film battery comprising (A) at least one sheet-like negative electrode as component (A), (B) at least one sheet-like positive electrode as component (B), (C) at least one electrolyte as component (C) and (D) at least one sheet-like separator arranged between the at least one negative electrode (A) and the at least one positive electrode (B) as component (D), wherein the at least one separator (D) comprises at least one anionically functionalized polymer, a process for producing this thin-film battery by joining together at least one negative electrode as component (A), at least one positive electrode as component (B), an electrolyte as component (C) and at least one separator as component (D), with the at least one separator comprising at least one polymer functionalized by anionic groups, the use of polymers functionalized by anionic groups as separator in thin-film batteries and the use of a thin-film battery according to the invention in electronic components.