Positive active material for rechargeable lithium battery and method of preparing same
AssigneeSamsung SDI Co., Ltd.
InventorsJae-Phil Cho, Chan-Soo Kim, Sang-Im Yoo
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Abstract
Disclosed is a positive active material for a rechargeable lithium battery and a method of preparing the same. The positive active material includes a LiCoO2 core and a metal selected from a group consisting of Al, Mg, Sn, Ca, Ti, Mn and mixtures thereof. The metal has a concentration gradient from a surface of the core to a center of the core. The method of preparing a positive active material for a rechargeable lithium battery includes the steps of dissolving a metal compound in alcohol to prepare a metal compound solution in a sol state, coating LiCoO2 with the metal compound solution in the sol state and sintering the coated LiCoO2 at 150 to 500° C.
Claims5
A positive active material for a rechargeable lithium battery comprising:
- a metal selected from the group consisting of Al, Mg, Sn, Ca, Ti, Mn, and mixtures thereof and
- a core comprising LiCoO2 and the metal, wherein the metal has a concentration gradient from a surface of the core to a center of the core, wherein the ratio of metal concentrations between the surface and the center of the core is 3 to 10:1.
A method of preparing a positive active material for a rechargeable lithium battery, the positive active material comprising a metal selected from a group consisting of Al, Mg, Sn, Ca, Ti, Mn and mixtures thereof, and a core comprising LiCoO2 and the metal, the metal having a concentration gradient from a surface of the core to a center of the core, wherein the ratio of metal concentrations between the surface and the center of the core is 3 to 10:1, the method comprising:
- dissolving a metal compound in alcohol to prepare a metal compound solution in a sol state;
- coating LiCoO2 with the metal compound solution in the sol state;
- and
- sintering the coated LiCoO2 at 150 to 500° C.
Dependencies are inferred from the claim text.