Positive Electrode Active Material For Secondary Battery And Method Of Preparing The Same
AssigneeLG Chem, Ltd.
InventorsSo Ra Baek, Ji Hye Kim, Tae Gu Yoo, Wang Mo Jung, Byung Chun Park
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Abstract
The present invention relates to a positive electrode active material for a secondary battery, which includes a core including a lithium composite metal oxide, and a surface treatment layer which is disposed on the core and includes an amorphous oxide containing a lithium (Li) oxide, a boron (B) oxide, and an aluminum (Al) oxide, wherein an amount of a lithium by-product present on a surface of the positive electrode active material is less than 0.55 wt % based on a total weight of the positive electrode active material, and a method of preparing the same.
Claims15
A positive electrode active material for a secondary battery, the positive electrode active material comprising:
- a core including a lithium composite metal oxide;
- and
- a surface treatment layer which is disposed on the core and includes an amorphous oxide containing a lithium oxide, a boron oxide, and an aluminum oxide,
- wherein the lithium oxide, the boron oxide, and the aluminum oxide are chemically bonded to one another, and
- in the amorphous oxide in the surface treatment layer, an amount of the aluminum oxide is greater than an amount of the boron oxide, and an amount of a lithium by-product present on a surface of the positive electrode active material is less than 0.55 wt % based on a total weight of the positive electrode active material.
A method of preparing a positive electrode active material for a secondary battery, the method comprising:
- preparing a mixture by mixing a lithium composite metal oxide, a boron-containing raw material, and an aluminum-containing raw material;
- and
- forming a surface treatment layer including an amorphous oxide on a core including the lithium composite metal oxide by performing a heat treatment on the mixture in an oxygen atmosphere,
- wherein the forming of the amorphous oxide is to form an amorphous oxide containing lithium, boron, and aluminum by reaction of a lithium by-product present on a surface of the lithium composite metal oxide with the boron-containing raw material and the aluminum-containing raw material,
- an amount of the aluminum-containing raw material included is greater than 1 time to less than 2.5 times an amount of the boron-containing raw material included, and the heat treatment is performed in a temperature range of 500° C. to 800° C.
Dependencies are inferred from the claim text.