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AssigneeLG Chem, Ltd.
InventorsIck Soon Kwak, Seung Beom Cho, Hwa Seok Chae, Yeo June Yoon
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Provided is a cathode active material including lithium transition metal oxide particles and composite particles, wherein the composite particles include any one selected from the group consisting of yttria stabilized zirconia (YSZ), gadolinia-doped ceria (GDC), lanthanum strontium gallate magnesite (LSGM), lanthanum strontium manganite (LSM), and nickel (Ni)—YSZ, or a mixture of two or more thereof, and the cathode active material includes the composite particles having a single-phase peak when analyzed by X-ray diffraction (XRD). A cathode active material according to an embodiment of the present invention may not only minimize the reduction in capacity or output of a secondary battery, but may also further improve life characteristics.
A cathode active material comprising:
A method of preparing a cathode active material, the method comprising mixing lithium transition metal oxide particles and composite particles and heat treating the mixture, wherein the composite particles comprise any one selected from the group consisting of yttria stabilized zirconia (YSZ), gadolinia-doped ceria (GDC), lanthanum strontium gallate magnesite (LSGM), calcium (Ca)-doped zirconia or calcia stabilized zirconia (CSZ), scandium (Sc)-doped zirconia (SSZ), and nickel (Ni)—YSZ, or a mixture of two or more thereof.
Dependencies are inferred from the claim text.
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Composites: as layered products
Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof: electrodes based on…
Of manganese: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
Of nickel, cobalt or iron: of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g.…
About 9 years 1 month of term left · ends 17 Nov 2035 (estimated)
The present application is a national phase entry under 35 U.S.C. § 371 of International Application No. PCT/KR2014/010355 filed Oct. 31, 2014, which claims priority from Korean Application No. 10-2013-0131636 filed Oct. 31, 2013, all of which are hereby incorporated herein by reference.
The present invention relates to a cathode active material, a preparation method thereof, and a lithium secondary battery comprising the cathode active material.
Lithium secondary batteries have been widely used as power sources of portable devices after they have emerged as small, lightweight, and high-capacity batteries since 1991. Recently, in line with the rapid development of electronics, communications, and computer industries, camcorders, mobile phones, and notebook PCs have appeared and undergone continuous and remarkable development. Accordingly, the demand for lithium secondary batteries as a power source for driving these portable electronic information and communication devices has increased day by day.
The following drawings attached to the specification illustrate preferred examples of the present invention by example, and serve to enable technical concepts of the present invention to be further understood together with detailed description of the invention given below, and therefore the present invention should not be interpreted only with matters in such drawings.
FIG. 1 is a predictive model illustrating the moving path of lithium in yttria stabilized zirconia (YSZ) composite particles that are optimized by discrete Fourier transformation (DFT) structural optimization;
FIG. 2 is a graph analyzing ionic conductivity according to oxygen vacancy in YSZ composite particles that are optimized by DFT structural optimization;
Hereinafter, the present invention will be described in more detail to allow for a clearer understanding of the present invention.
It will be understood that words or terms used in the specification and claims shall not be interpreted as the meaning defined in commonly used dictionaries. It will be further understood that the words or terms should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the technical idea of the invention, based on the principle that an inventor may properly define the meaning of the words or terms to best explain the invention.
A cathode active material according to an embodiment of the present invention includes lithium transition metal oxide particles; and composite particles, wherein the composite particles include any one selected from the group consisting of yttria stabilized zirconia (YSZ), gadolinia-doped ceria (GDC), lanthanum strontium gallate magnesite (LSGM), lanthanum strontium manganite (LSM), calcium (Ca)-doped zirconia or CaO-stabilized zirconia (CSZ), scandium (Sc)-doped zirconia (SSZ), and nickel (Ni)—YSZ, or a mixture of two or more thereof, and the composite particles have a single-phase peak when analyzed by X-ray diffraction (XRD).