Preventing　high-temperature　oxidation　and　enhancing　corrosion　resistance　are　crucial　factors　influencing　the　quality　of　copper　foil　in　lithium-ion　batteries　and　their　overall　service　life.　The　development　of　chromium-free　antioxidation　systems　has　gained　significant　attention　due　to　their　environmental　advantages.　In　this　study,　we　formulated　an　antioxidation　liquid　composed　of　polyvinyl　alcohol　(PVA),　nano-silica(nano-SiO2),　and　citric　acid　(CA),　and　applied　it　to　copper　foil　using　a　chemical　impregnation　process.　Various　characterization　techniques,　including　scanning　electron　microscopy　(SEM),　Tafel　curves,　X-ray　photoelectron　spectroscopy　(XPS),　atomic　force　microscopy　(AFM),　and　electrochemical　impedance　spectroscopy　(EIS),　were　utilized　to　investigate　the　microstructure,　antioxidation　properties,　and　corrosion　resistance　of　the　treated　copper　foil.　The　results　demonstrate　that　with　a　PVA　concentration　of　4　g/L,　nano-SiO2　concentration　of　7　g/L,　and　CA　concentration　of　5　g/L,　the　treated　copper　foil　exhibits　excellent　resistance　to　high-temperature　oxidation　and　corrosion.　Specifically,　under　conditions　of　140℃　for　15　min,　the　surface　of　the　copper　foil　remains　largely　unchanged,　and　the　corrosion　resistance　efficiency　can　reaches　75.49　%.　The　study　reveals　a　trend　of　cross-linking　between　PVA　and　CA,　which　rapidly　forms　a　protective　film　on　the　copper　foil　surface.　Nano-SiO2　acts　as　a　filler,　mitigating　defects　and　enhancing　the　density　and　robustness　of　the　film.　This　chromium-free,　environmentally　friendly　antioxidation　process　aligns　with　sustainable　development　principles　and　offers　new　insights　for　advancing　chromium-free　antioxidation　technologies.　©　2024　Elsevier　B.V.