Cathode material for Li-ion battery, method for preparing the same and Li-ion battery containing the same

摘要

The present invention relates to the field of the Li-ion battery and, particularly, relates to a cathode material for the Li-ion battery, a method for preparing the same and a Li-ion battery containing the same. A surface of the cathode material of spinel type lithium-manganese-nickel-containing composite oxide of the present invention is coated with a complex coating layer composed of a first coating layer containing Li₇La₃Zr₂O₁₂ and a second coating layer containing LiNbO₃. The method includes: firstly coating the first coating layer containing Li₇La₃Zr₂O₁₂ on the surface of spinel type lithium-manganese-nickel-containing composite oxide in a solid phase method; and then coating the second coating layer containing LiNbO₃ in a hydro-thermal method. The cathode material of the present invention improves cycle stability and rate performance of spinel type lithium-manganese-nickel-containing composite oxide, and meanwhile reduces dissolution and erosion effect of the electrolyte on the cathode material during charging or discharging.