Cathode active material and preparation method thereof and lithium ion secondary battery prepared by cathode active material

A negative electrode active material and oxide technology, applied in the field of negative electrode active material and its preparation, can solve the problems that restrict the performance of the battery, and achieve the effect of avoiding the contact short circuit of the positive and negative electrodes, dense and uniform coating layer, and reducing the content

Inactive Publication Date: 2013-11-20
IRICO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially after the lithium titanate battery is stored at high temperature, a large amount of gas will accumulate inside the battery, and the expansion phenomenon of the battery is very obvious, which seriously restricts the performance of the battery

Method used

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  • Cathode active material and preparation method thereof and lithium ion secondary battery prepared by cathode active material
  • Cathode active material and preparation method thereof and lithium ion secondary battery prepared by cathode active material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Mix spherical oxides and rod-shaped oxides to obtain mixed oxides, put the mixed oxides into a solution of N-methylpyrrolidone with a mass fraction of 4% polyvinylidene fluoride and ball mill and mix for 1 hour, then add lithium titanate and Ball milling and mixing for 3 hours to obtain a slurry, heat the slurry and stir at 170°C until the sample is dried to obtain a titanium-based composite material, the titanium-based composite material is passed through Ar or N 2 Or bake at 600° C. for 24 hours under vacuum, and then cool down to room temperature to obtain the negative electrode active material. The spherical oxide and the rod-shaped oxide are respectively zirconia. It can be purchased from a supplier, the aspect ratio (the ratio of the longest side to the thickness) of the rod-shaped oxide is 6, the particle size of the spherical oxide and the longest side of the rod-shaped oxide are 7 μm, and the mixed oxide The mass fraction of rod-shaped oxides in the product is ...

Embodiment 2

[0024] Mix spherical oxides and rod-shaped oxides to obtain mixed oxides, put the mixed oxides into a solution of N-methylpyrrolidone with a mass fraction of 4% polyvinylidene fluoride and ball mill and mix for 1 hour, then add lithium titanate and Ball milling and mixing for 3 hours to obtain a slurry, heat the slurry and stir at 170°C until the sample is dried to obtain a titanium-based composite material, the titanium-based composite material is passed through Ar or N 2 Or bake at 600° C. for 30 hours under vacuum, and then cool down to room temperature to obtain the negative electrode active material. The spherical oxide and the rod-shaped oxide are respectively magnesium oxide. Lithium titanate can be prepared by methods disclosed in the art, or It can be purchased through a supplier, the aspect ratio (the ratio of the longest side to the thickness) of the rod-shaped oxide is 2, the particle size of the spherical oxide and the longest side of the rod-shaped oxide are 10 μm...

Embodiment 3

[0026] Mix spherical oxides and rod-shaped oxides to obtain mixed oxides, put the mixed oxides into a solution of N-methylpyrrolidone with a mass fraction of 4% polyvinylidene fluoride and ball mill and mix for 1 hour, then add lithium titanate and Ball milling and mixing for 3 hours to obtain a slurry, heat the slurry and stir at 170°C until the sample is dried to obtain a titanium-based composite material, the titanium-based composite material is passed through Ar or N 2 Or bake at 600° C. for 36 hours under vacuum, and then cool down to room temperature to obtain the negative electrode active material. The spherical oxide and the rod-shaped oxide are respectively yttrium oxide, and lithium titanate can be prepared by methods disclosed in the art. It can be purchased through a supplier, the aspect ratio (the ratio of the longest side to the thickness) of the rod-shaped oxide is 4, the particle size of the spherical oxide and the longest side of the rod-shaped oxide are 0.005 ...

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Abstract

The invention provides a cathode active material and a preparation method thereof and a lithium ion secondary battery prepared by the cathode active material. The preparation method comprises the following steps: mixing spherical oxides and rod-like oxides to obtain mixed oxides, performing ball milling and mixing of the mixed oxides in an N-methyl pyrrolidone solution of polyvinylidene fluoride with a mass fraction of 4% for 1 hour, adding lithium titanate and performing ball milling and mixing for 3 hours to obtain slurry, heating the slurry, stirring at 170 DEG C till the slurry is dried to obtain a titanium composite material, roasting the titanium composite material at 600 DEG C for 24-72 hours in Ar or N2 atmosphere or under vacuum, cooling to room temperature to obtain the cathode active material; the obtained cathode active material has the characteristic of dense and uniform coating layer, can effectively reduce the contact of lithium titanate and water; because of the nano-scale particle sizes of the oxides, the oxides can effectively coat lithium titanate, and thus avoid the generation of swollen phenomenon to the maximum extent, and facilitate the improvement of the cycle life, the storage performance and the security of the lithium ion secondary battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion secondary batteries, and in particular relates to a negative electrode active material, a preparation method thereof and a lithium ion secondary battery prepared by using the negative electrode active material. Background technique [0002] In 1956, Jonker et al first proposed the existence of lithium titanate, a spinel structure material, which has attracted people's attention. At first, scientific and technological workers focused more on the electronic structure of the material system with superconducting properties. Until 1994, E.Ferg et al. first proposed the possibility of lithium titanate as the negative electrode material of lithium-ion batteries. In 1995, T.ohzuku et al. analyzed its crystal structure and verified its electrochemical performance, and found that the voltage platform was 1.5V. The theoretical capacity is 175mAh / g. [0003] Lithium titanate is a white substance that ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M10/0525H01M4/62
CPCY02E60/122Y02E60/10
Inventor 刘国刚
Owner IRICO
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