Surface-modified anode material for lithium ion battery and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of material discharge specific capacity or energy density reduction, metal oxides do not have electrochemical activity, and material cycle performance does not improve, etc. problems, to achieve the effect of sufficient raw material resources, good industrial application prospects, and low equipment requirements

Inactive Publication Date: 2015-10-28
ZHEJIANG MEIDARUI NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although nickel-cobalt-lithium aluminate has many advantages, its application is limited due to the disadvantages of high hygroscopicity and insufficient cycle performance. Therefore, the modification of materials has become an urgent problem to be solved.
At present, there are many studies on coating metal oxide on the surface of nickel-cobalt lithium aluminate to improve the cycle performance and safety performance of the material, but the metal oxide is not electrochemically active, and the coating modification of the material will lead to the degradation of the material. Decreased discharge specific capacity or energy density
Another modification method is to dope the material with metal elements to improve the rate performance of the material, but it does not improve the cycle performance of the material.

Method used

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  • Surface-modified anode material for lithium ion battery and preparation method thereof
  • Surface-modified anode material for lithium ion battery and preparation method thereof
  • Surface-modified anode material for lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] La 2 o 3 and BaTiO 3 Press Ba 0.998 La 0.002 TiO 3 The stoichiometric ratio ingredients are wet-mixed, mixed uniformly, dried, and lanthanum-doped modified barium titanate powder is obtained after sintering and grinding. Add the lanthanum-doped modified barium titanate powder into absolute ethanol for high-speed stirring for 30 minutes, then perform ultrasonication for 10 minutes, successively high-speed stirring and ultrasonic circulation for 3 to 5 times, and mix uniformly to form a uniform solution. The active material LiNi 0.8 co 0.15 Al 0.05 o 2 Add it into the above mixed solution under the condition of high-speed stirring, so that the coating material is uniformly coated on the active material LiNi 0.8 co 0.15 Al 0.05 o 2 surface, and then the mixture was dried for 6 hours, and the dried solid material was calcined at 500° C. for 10 hours, then cooled, pulverized, and sieved to obtain the positive electrode material.

[0028] The electrochemical perf...

Embodiment 2

[0030] Will Nb 2 o 5 and BaTiO 3 Press BaTi 0.997 Nb 0.003 o 3 The stoichiometric ratio ingredients are wet-mixed, mixed uniformly, dried, sintered and ground to obtain niobium-doped modified barium titanate powder. Add the niobium-doped modified barium titanate powder into deionized water for 30 minutes of high-speed stirring, and then perform ultrasonication for 10 minutes, followed by high-speed stirring and ultrasonic circulation for 3 to 5 times, and mix uniformly to form a uniform solution. The active material LiNi 0.75 co 0.2 Al 0.05 o 2 Add it into the above mixed solution under the condition of high-speed stirring, so that the coating material is uniformly coated on the active material LiNi 0.75 co 0.2 Al 0.05 o 2 Then, the mixture was dried for 8 hours, and the dried solid material was calcined at 600° C. for 8 hours, then cooled, pulverized, and sieved to obtain the positive electrode material.

Embodiment 3

[0032] Will Y 2 o 3 and BaTiO 3 Press Ba 0.999 Y 0.001 TiO 3 The stoichiometric ratio ingredients are wet-mixed, mixed uniformly, dried, sintered and ground to obtain yttrium-doped modified barium titanate powder. Add the yttrium-doped modified barium titanate powder into absolute ethanol for 30 minutes of high-speed stirring, and then perform ultrasonication for 10 minutes, followed by high-speed stirring and ultrasonic circulation for 3 to 5 times, and mix uniformly to form a uniform solution. The active material LiNi 0.7 co 0.2 Al 0.1 o 2 Add it into the above mixed solution under the condition of high-speed stirring, so that the coating material is uniformly coated on the active material LiNi 0.7 co 0.2 Al 0.1 o 2 surface, and then the mixture was dried for 7 hours, and the dried solid material was calcined at 800° C. for 6 hours, cooled, pulverized, and sieved to obtain the positive electrode material.

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Abstract

The invention relates to a surface-modified anode material for a lithium ion battery and a preparation method thereof. The general chemical formula of the anode material is LiNi1-a-bCoaAlbO2 / M, wherein 0.1<a<0.3 and 0.01<b<0.2, M is a coating layer, and the coating layer is any of La, Nb doping modified barium titanate powder. The substance amount ratio of the doping elements and the barium titanate is 0-0.05:1. The weight ratio of the coating layer to the LiNi1-a-bCoaAlbO2 is 0.001-0.1:1. The preparation method comprises the steps that the barium titanate powder is added into the solvent, the mixed solution is formed, the mixed solution is coated on the surface of the LiNi1-a-bCoaAlbO2 uniformly, and the anode material is obtained through drying, calcining, cooling, smashing and sieving. The surface-modified anode material for the lithium ion battery and the preparation method thereof have the advantages that the circulating performance, stability and rate capability of the lithium ion battery are improved, the synthetic process is simple and easy to implement, the equipment requirement is low, the raw material resource is abundant and cheap, pollution does not occur, and good industrial application prospect is achieved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a surface-modified lithium ion battery cathode material and a preparation method thereof. Background technique [0002] As a new generation of green and environment-friendly power supply, lithium-ion batteries have the advantages of high energy density, high voltage, small self-discharge, and no memory effect. They are widely used in mobile phones, cameras, notebook computers, power tools, electric bicycles, and electric vehicles. . With the rapid development of electronic products, the energy and power requirements of lithium-ion batteries are getting higher and higher, and the positive electrode material of lithium-ion batteries is an important part of lithium-ion batteries and the main factor affecting the performance of lithium-ion batteries. Compared with the industrialized positive electrode materials lithium cobalt oxide, lithium manganese oxide, lithium nickel cobalt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/485H01M4/525H01M10/0525
CPCH01M4/485H01M4/525H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 毛玉琴韩珽
Owner ZHEJIANG MEIDARUI NEW MATERIAL TECH CO LTD
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