Efficient　and　environmentally-friendly　methods　are　needed　to　recycle　spent　power　lithium-ion　batteries.　In　this　research,　a　simple　solid-state　method　without　secondary　pollution　is　used　to　directly　recover　the　cathode　material　from　spent　power　lithium-ion　batteries.　The　recycled　LiNi0.5Co0.2Mn0.3O2　(S-LNCM)　crystal　cathode　material　was　activated　by　high-energy　ball-milling　after　pre-heating　to　remove　C　and　F　elements　derived　from　the　electrolyte.　In　situ　high-temperature　XRD　was　used　to　explore　the　crystal　regeneration　process　of　the　recycled　materials　during　sintering.　The　XRD　refinement　results　and　TEM　images　indicated　that　serious　cation　mixing　was　reduced,　and　phase　transitions　on　the　surface　of　the　spent　material　restored　its　layered　structure.　XAFS　spectra　showed　that　the　coordination　structure　of　the　regenerated　materials　was　almost　the　same　as　that　of　a　commercial　material.　The　first　discharge　capacity　of　the　regenerated　materials　(LNCM-950,　140　mAh　g(-1),　0.2　C)　was　much　higher　than　that　of　the　spent　materials　(10　mAh　g(-1),　0.2　C),　and　the　cyclic　stability　(97%)　was　higher　than　that　of　the　commercial　material　(91%)　at　0.2　C　after　50　cycles.　These　results　show　that　simple　solid-state　method　combined　with　high-energy　ball-milling　can　be　used　to　easily　repair　the　crystal　structure　and　electrochemical　performance　of　spent　LiNi0.5Co0.2Mn0.3O2　material.