Preparation method of Mg-doped lithium nickel cobalt aluminum oxide positive electrode material

A technology of nickel cobalt lithium aluminate and cathode material, which is applied in battery electrodes, electrical components, circuits, etc., can solve the problems of complex process, lower real density, and poor precursor lattice order, and achieve material performance. Excellent, easy-to-react effect

Inactive Publication Date: 2017-04-05
河南科隆新能源股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The solid-phase method has a simple process and low cost, but the synthesis of materials by this method has disadvantages such as poor electrochemical stability, uneven distribution of aluminum elements, and irregular crystal morphology; the sol-gel method is complicated in process and high in cost, and is not suitable for large-scale Industrialized production; coprecipitation process is relatively simple, and the synthesized material has excellent electrochemical p

Method used

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  • Preparation method of Mg-doped lithium nickel cobalt aluminum oxide positive electrode material
  • Preparation method of Mg-doped lithium nickel cobalt aluminum oxide positive electrode material
  • Preparation method of Mg-doped lithium nickel cobalt aluminum oxide positive electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0037] (1) Using nickel sulfate, cobalt sulfate, sodium metaaluminate, and magnesium acetate as raw materials, according to the molar ratio of Ni: Co: Al 0.92: 0.5: 0.03, the doping ratio of Mg is 0.3%, and the doping is prepared by coprecipitation method. The composite hydroxide precursor of the spherical nickel-cobalt-aluminum of Mg, the SEM picture of the composite hydroxide precursor is as follows figure 1 shown;

[0038] (2) Put the Mg-doped nickel-cobalt-aluminum composite hydroxide precursor in a resistance furnace, raise the temperature to 800°C at a rate of 5°C / min, keep it for 10 hours, and pre-oxidize in an oxygen atmosphere to obtain nickel-cobalt-aluminum Composite oxide Ni 1-x-y co x Al y o 2 , x=0.05, y=0.03;

[0039] (3) Mix the composite oxide of nickel-cobalt-aluminum and lithium hydroxide according to the ratio of atomic ratio nLi:(nNi+nCo+nAl)=1.20:1, use ethanol as the ball milling medium, ball mill for 10 hours evenly, dry and place After slowly hea...

Embodiment 2

[0042] (1) With nickel sulfate, cobalt sulfate, aluminum chloride, magnesium chloride as raw materials, according to Ni: Co: Al molar ratio 0.80: 0.15: 0.05, the doping ratio of Mg is 0.2%, prepare Mg-doped by co-precipitation method Composite hydroxide precursor of spherical nickel-cobalt-aluminum;

[0043] (2) Put the Mg-doped nickel-cobalt-aluminum composite hydroxide precursor in a resistance furnace, raise the temperature to 500°C at a rate of 3°C / min, keep it warm for 5 hours, and pre-oxidize in an oxygen atmosphere to obtain nickel-cobalt-aluminum The composite oxide Ni1-x-yCoxAlyO2, x=0.15, y=0.05;

[0044] (3) Mix the composite oxide of nickel-cobalt-aluminum and lithium hydroxide according to the ratio of atomic ratio nLi:(nNi+nCo+nAl)=1.11:1.0, use ethanol as ball milling medium, ball mill for 6 hours evenly, dry and place After slowly heating up to 650°C in an oxygen atmosphere in a resistance furnace, keep the temperature at a constant temperature for 15 hours, c...

Embodiment 3

[0047] (1) Using nickel sulfate, cobalt sulfate, aluminum sulfate and magnesium sulfate as raw materials, according to the Ni: Co: Al molar ratio of 0.73: 0.25: 0.02, the doping ratio of Mg is 0.02%, and prepare Mg doped by co-precipitation method Composite hydroxide precursor of spherical nickel-cobalt-aluminum;

[0048] (2) Put the Mg-doped nickel-cobalt-aluminum composite hydroxide precursor in a resistance furnace, raise the temperature to 300°C at a rate of 1°C / min, keep it for 1 hour, and pre-oxidize in an oxygen atmosphere to obtain nickel-cobalt-aluminum The composite oxide Ni1-x-yCoxAlyO2, x=0.25, y=0.02;

[0049] (3) Mix the composite oxide of nickel-cobalt-aluminum and lithium hydroxide according to the ratio of atomic ratio nLi:(nNi+nCo+nAl)=1.10:0.80, use ethanol as ball milling medium, ball mill for 3 hours evenly, dry and place After slowly raising the temperature to 500°C in an oxygen atmosphere in a resistance furnace, keep the temperature constant for 10 hou...

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Abstract

The invention relates to a preparation method of a Mg-doped lithium nickel cobalt aluminum oxide positive electrode material. The method comprises the following steps: 1, preparing a Mg-doped spherical nickel cobalt aluminum hydroxide precursor through a coprecipitation technology; and 2, individually carrying out preoxidation calcining treatment on the Mg-doped spherical nickel cobalt aluminum hydroxide precursor to obtain a high-valence spherical Mg-doped nickel cobalt aluminum oxide uniform solid solution, mixing the a high-valence Mg-doped nickel cobalt aluminum oxide with a lithium source, carrying out high temperature calcination in oxygen atmosphere, cooling the obtained calcination product, and crushing the cooled calcination product to obtain the Mg-doped lithium nickel cobalt aluminum oxide positive electrode material. The lithium nickel cobalt aluminum oxide positive electrode material prepared through the method has the characteristics of high energy density, low cost, simple preparation technology, and easiness in realization of industrialization, and has greatly better battery specific capacity, rate and other cell performances than Mg-free materials.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery positive electrode material, in particular to a preparation method of a nickel cobalt lithium aluminate positive electrode material. Background technique [0002] Lithium-ion batteries have been widely used in 3C, power and energy storage fields due to their high energy density, good cycle performance, and environmental protection. However, with the rapid development of society, people's demand for lithium-ion batteries with high energy density and smaller volume is becoming more and more urgent. The improvement of the energy density of lithium-ion batteries mainly depends on the positive electrode material and the negative electrode material. At present, the specific capacity of the lithium-ion negative electrode material is much higher than that of the positive electrode material. Therefore, the positive electrode material has become the main bottleneck restricting the energy impr...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/1397
CPCH01M4/1397H01M4/5825Y02E60/10
Inventor 梁国文程迪
Owner 河南科隆新能源股份有限公司
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