The　recovery　and　reuse　of　resources　from　spent　lithium-ion　batteries　present　significant　potential　for　sustainable　development　and　environmental　protection.　However,　challenges　remain,　particularly　in　addressing　complex　issues　such　as　the　removal　of　aluminum　(Al)　impurities.　This　paper　introduces　an　efficient　and　selective　process　for　leaching　lithium　(Li)　from　LiFePO4　cathode　material　powder,　even　in　the　presence　of　hard-to-remove　Al　impurities.　First,　the　LiFePO4　cathode　material　was　separated　from　damaged　Al　foil　current　collectors　using　an　environmentally　friendly　water　stripping　method,　resulting　in　the　active　material　powder　containing　Al　impurities.　In　the　subsequent　process,　a　small　amount　of　H3PO4　was　used　as　a　leaching　agent,　H2O2　as　an　oxidant,　and　the　cathode　material　was　subjected　to　mechanical　activation　by　ball　milling.　After　continuous　optimization　of　all　conditions,　an　efficient　leaching　of　99.5　%　Li　was　achieved,　with　almost　all　(＞99　%)　Fe　and　Al　impurities　separated　as　precipitates.　Li　in　the　leachate　was　precipitated　as　Li2CO3　by　adding　Na2CO3　at　95　degrees　C,　achieving　a　purity　of　99.2　%.　A　magnetic　separation　scheme　is　presented　to　successfully　separate　FePO4　from　Al-containing　impurities　in　the　leaching　residue.　After　five　magnetic　separation　cycles,　the　purity　of　FePO4　exceeded　98.5　%.　Additionally,　the　mechanisms　of　the　entire　reaction　system　were　investigated　using　characterization　methods　such　as　laser　particle　size　analysis,　XPS,　and　XRD.　A　comprehensive　economic　evaluation　of　the　entire　system　confirms　its　feasibility.　This　eco-friendly　selective　separation　process　shows　strong　potential　for　industrial　applications　and　makes　a　valuable　contribution　to　sustainable　development.