A　lithium　ion-sieve　manganese　oxide　(MO)　derived　from　Li-enriched　MO　was　prepared　by　the　glycolic　acid　complexation　method.　The　Li　adsorption　performance　in　a　LiCl-NH3H2O-NH4Cl　buffer　solution,　simulated　a　spent　lithium-ion　battery　(LIB)　processing　solution,　and　actual　spent　LIB　processing　solution　were　studied.　An　adsorption　capacity　of　27.4mg/g　was　observed　in　the　LiCl-NH3H2O-NH4Cl　buffer　solution　(Li　concentration　of　0.2mol/L,　pH=9),　and　the　adsorption　behavior　conformed　to　the　Langmuir　adsorption　isotherm　equation　with　a　linear　correlation　coefficient　(R-2)　of　0.9996.　An　adsorption　capacity　of　19mg/g　was　observed　in　the　simulated　buffer　spent　battery　solution　(Li　concentration　of　0.15mol/L,　pH=7),　and　an　adsorption　capacity　of　17.8mg/g　was　observed　in　the　actual　spent　battery　solution　(Li　concentration　of　0.15mol/L,　pH=7).　X-ray　diffraction,　scanning　electron　microscope,　and　infrared　spectrum　results　revealed　that　the　structure　and　morphology　of　MO　are　stable　before　and　after　adsorption,　and　the　adsorption　of　MO　in　all　of　the　abovementioned　buffer　systems　conforms　to　the　Li+-H+　ion-exchange　reaction　mechanism.　The　lithium　ion-sieve　MO　demonstrates　promise　for　the　recovery　of　lithium　from　spent　LIBs.