| abstract |
Disclosed are a nickel active material precursor for a lithium secondary battery, a method for preparing the nickel active material precursor, a nickel active material for a lithium secondary battery prepared by the method, and a lithium having a positive electrode containing the nickel active material Secondary battery, the nickel active material precursor includes a porous core and a porous shell, wherein the porosity of the shell is greater than the porosity of the core, a dense intermediate layer is arranged between the porous core and the porous shell, and the porosity of the dense intermediate layer is smaller than that of the core porosity and shell porosity. |