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US 2015/0147653 A1Published application
Positive electrode for rechargeable lithium battery, preparing same, and rechargeable lithium battery
AssigneeSamsung SDI Co., Ltd.
InventorsKeisuke Nomura, Yuki Takei, Masatsugu Nakano
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Abstract
A positive active material is disclosed that includes a lithium nickel composite oxide represented by the following Chemical Formula 1, wherein a full width at half maximum (FWHM003) at a (003) plane in X-ray diffraction ranges from about 0.12 to about 0.155, and a rechargeable lithium ion battery including the same. LiaNixCoyMzO2 [Chemical Formula 1]
Claims8
A positive active material that includes a lithium nickel composite oxide represented by the following Chemical Formula 1,
- wherein a full width at half maximum (FWHM003) at a (003) plane in X-ray diffraction ranges from about 0.12 to about 0.155.
- LiaNixCoyMzO2 [Chemical Formula 1]
- wherein, M is one or more kinds of metal element selected from Al, Mn, Cr, Fe, V, Mg, Ti, Zr, Nb, Mo, W, Cu, Zn, Ga, In, Sn, La, and Ce,
- 0.20≦a≦1.20,
- 0.80≦x<1.00,
- 0<y≦0.20,
- 0≦z≦0.10, and
- x+y+z=1.
5 more elements
A method of preparing a positive active material, comprising;
- adding a saturated NaOH aqueous solution to a mixed aqueous solution including a hydrate of Co and Ni and an M-containing compound in a dropwise fashion so as to maintaining pH to be 8 to 12;
- agitating the resulting mixture to prepare a hydroxide salt precursor of a transition metal;
- and
- mixing the hydroxide salt precursor of the transition metal with a Li compound, and firing the resultant under an oxygen atmosphere at about 700° C. to about 800° C. for about 1 hour to about 10 hours to prepare a lithium nickel composite oxide,
- wherein the M-containing compound is a sulfate, a nitrate, an oxide, or a hydroxide of the metal element M, and
- the M is one or more kinds of metal element selected from Al, Mn, Cr, Fe, V, Mg, Ti, Zr, Nb, Mo, W, Cu, Zn, Ga, In, Sn, La, and Ce.
3 more elements
Dependencies are inferred from the claim text.