Lithium metal oxide, negative electrode active material for lithium secondary battery comprising the same, and method of preparing the same
a technology of lithium secondary batteries and active materials, which is applied in the direction of cell components, final product manufacturing, sustainable manufacturing/processing, etc., can solve the problems of limited application and possible non-reversible reactions, and achieve excellent electrochemical properties, long life, and high initial efficiency and output.
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example 1
[0115]A homogeneous solution was prepared by mixing 50 ml of distilled water with 0.05 g of nickel (II) nitrate hexahydrate. 0.5 g of lithium titanium oxide (Li4Ti5O12) was added thereto and stirred for 2 hours to obtain a uniform mixed solution comprising a complex in which nickel (II) nitrate hexahydrate is complexed on a surface of the lithium titanium oxide (Li4Ti5O12).
[0116]The homogeneous mixed solution was heat-treated under an inert gas atmosphere of Ar at 500° C. for 2 hours to prepare a lithium titanium oxide, a surface of which was coated with a nickel oxide (NiOa).
example 2
on of Coin-Type Half-Cells
[0118]A slurry was prepared by mixing the lithium titanium oxide having a surface coated with a nickel oxide and prepared in Example 1, as a negative electrode active material, carbon, as a conductive material, and polyvinylidene fluoride (PVdF), as a binder, at a weight ratio of 90:3:7 and by mixing the mixture with N-methyl pyrrolidone, which is a solvent. A negative electrode was prepared by coating the prepared slurry on one surface of a copper collector at a thickness of 180 μm, rolling the slurry, and drying the slurry for 6 or more hours in a vacuum oven of 120° C.
[0119]An electrochemical cell was prepared by using the prepared negative electrode. A lithium metal foil was used as a counter electrode.
[0120]1 M of a LiPF6 non-aqueous electrolyte was prepared as an electrolyte by adding LiPF6 to a non-aqueous electrolyte solvent prepared by mixing ethylene carbonate and diethyl carbonate at a volume ratio of 1:1, and then coin-type half-cells were prepa...
experimental example 2
[0125]Images were photographed for each of the lithium titanium oxide having a surface coated with a nickel oxide of Example 1 and the lithium titanium oxide of Comparative Example 1 by using a scanning electron microscope (SEM), and results therefrom were shown in FIG. 2.
[0126]As confirmed through FIG. 2, it can be found that the shape and the particle size of the lithium titanium oxide having a surface coated with a nickel oxide and prepared according to Example 1 are similar to those of the lithium titanium oxide, a surface of which was not treated, of Comparative Example 1.
[0127]Through Experimental Examples 1 and 2, it could be confirmed that the shape and the particle size of the lithium titanium oxide having a surface coated with a nickel oxide, which was prepared according to Example 1 were not changed by surface coating of the nickel oxide. In addition, from the results, it could be confirmed that electrochemical properties were not improved by changes in the shape and size...
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