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Manufacturing method of lithium-titanium composite oxide in which different metals are doped, and lithium-titanium composite oxide manufactured thereby in which different metals are doped

A technology for compounding dissimilar metals and lithium-titanium is applied in the field of lithium-titanium composite oxides doped with dissimilar metals and lithium-titanium composite oxides doped with two dissimilar metals. Titanium composite oxide has problems such as small effective capacity, and achieves the effect of excellent capacity characteristics and structural characteristics

Inactive Publication Date: 2016-04-27
POHANG IRON & STEEL CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned rutile TiO 2 (r-TiO 2 ) is a rock-salt structure, although it is electrochemically active, its reaction rate is low, it has a sloped potential curve, and its capacity is small. Therefore, there is a problem that the effective capacity of the obtained lithium-titanium composite oxide is small

Method used

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  • Manufacturing method of lithium-titanium composite oxide in which different metals are doped, and lithium-titanium composite oxide manufactured thereby in which different metals are doped
  • Manufacturing method of lithium-titanium composite oxide in which different metals are doped, and lithium-titanium composite oxide manufactured thereby in which different metals are doped
  • Manufacturing method of lithium-titanium composite oxide in which different metals are doped, and lithium-titanium composite oxide manufactured thereby in which different metals are doped

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Production of a dissimilar metal-doped lithium-titanium composite oxide

[0066] As starting materials, 1 mol of lithium hydroxide, 1 mol of anatase-type titanium oxide, and 0.1 mol of Zr as a dissimilar metal were used, mixed in a solid phase, and dissolved in water while stirring.

[0067] After pulverizing at 3000 rpm using zirconia beads, the inlet hot air temperature was set to 270°C and the outlet hot air temperature was set to 120°C for spray drying, and the firing temperatures were adjusted to two of 750°C and 770°C, respectively. At this temperature, heat treatment was performed in an oxygen environment for 10 hours, and dry pulverization was performed using a jet jet mill to produce a zirconium-doped lithium-titanium composite oxide.

[0068] A lithium-titanium composite oxide was produced by mixing Al, Mg, and Na in an amount of 0.05 mol as dissimilar metals by the same method as above.

experiment example 1-1

[0069] SEM photograph measurement

[0070] An SEM photograph of the lithium-titanium composite oxide doped with a dissimilar metal produced in Example 1 above is shown in figure 1 middle.

experiment example 1-2

[0071] Evaluation of Battery Characteristics - Measurement of Capacity Characteristics and Rate Characteristics

[0072]The lithium-titanium composite oxide doped with a dissimilar metal produced in the above-mentioned Example 1 was used as an anode active material, a lithium foil was used as a counter electrode, and a porous polyethylene film (Celgard 2300 manufactured by Cellgarde LLC, thickness: 25 μm) was used as an anode active material. As a separator, LiPF was dissolved at a concentration of 1 molar in a solvent in which ethylene carbonate and dimethyl carbonate were mixed at a volume ratio of 1:2. 6 The liquid electrolyte was used to manufacture a coin cell battery using a well-known manufacturing process. Also in the case of the comparative example, a coin cell battery was produced by the same method.

[0073] The capacity and rate characteristics of the test cells comprising the lithium-titanium composite oxide doped with a dissimilar metal of Example 1 above wer...

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Abstract

The present invention relates to a manufacturing method of a lithium-titanium composite oxide in which two different metals are doped, and a lithium-titanium composite oxide manufactured thereby in which two different metals are doped. More specifically, the present invention relates to a manufacturing method of a lithium-titanium composite oxide in which different metals are doped, thereby adjusting the content of impurities by mixing two different metals in a solid phase after adjusting the mixing ratio of the two different metals, grinding the mixture, and spray-drying the ground mixture, and to a lithium-titanium composite oxide manufactured thereby in which different metals are doped. By doping two different metals on the surface of a lithium-titanium composite oxide after adjusting the ratio of the two different metals to be appropriate, the present invention reduces the content of rutile type titanium dioxide, anatase type titanium dioxide, and Li2TiO3, which have been included as impurities in the prior art, thereby manufacturing titanium dioxide having excellent capacity characteristics and structural characteristics. In addition, a battery comprising such titanium dioxide exhibits excellent battery characteristics in which the early charge / discharge efficiency and the rate capability are high.

Description

technical field [0001] The present invention relates to a method for producing a dissimilar metal-doped lithium-titanium composite oxide, and a lithium-titanium composite oxide doped with two dissimilar metals produced by the method. More specifically, it relates to a method for producing a dissimilar metal-doped lithium-titanium composite oxide capable of adjusting the impurity content by adjusting the mixing ratio of two dissimilar metals and performing solid-phase mixing, pulverization, and spray drying, and The dissimilar metal-doped lithium-titanium composite oxide produced by this method. Background technique [0002] Non-aqueous electrolyte batteries that are charged and discharged by the movement of lithium ions to the negative electrode and the positive electrode are high energy density batteries, and research and development are being actively carried out. In recent years, lithium-titanium composite oxides with high Li adsorption / release potential have attracted a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/04C01D15/02B01J6/00
CPCC01G23/005C01P2002/50C01P2002/52C01P2004/03C01P2004/61C01P2004/62H01M10/052C01P2006/40H01M4/485Y02E60/10C01G23/04C01D15/02B01J6/00C01G25/006H01M10/0525H01M2004/027H01M2004/028
Inventor 崔洙逢崔準和高炯信李宰安
Owner POHANG IRON & STEEL CO LTD
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