Lithium cobaltate-coated high-nickel ternary positive electrode material and preparation method thereof

A positive electrode material, lithium cobalt oxide technology, applied in the field of lithium cobalt oxide coated high-nickel ternary positive electrode materials and its preparation, can solve the problems of reducing lithium carbonate content, reducing the residual alkali on the surface, avoiding direct contact with air The effect of contact

Inactive Publication Date: 2019-09-17
RUYUAN DONGYANGGUANG MAGNETIC MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] In the current coating process, two different positive electrode materials are often coated with each other to obtain a composite material with the respective properties of the two materials; the mutual coating materials used include lithium iron lithium oxide, titanium phosphate Lithium, lithium manganese oxide, lithium cobalt oxide, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminate, etc.; the coating methods of this type are also different, some simply mix the two finished materials for coating, and some In the preparation process, after mixing and coating, sintering, etc.; in this type of coating process, the excellent properties of the two materials can be combined to a certain extent, but some of them have imp

Method used

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  • Lithium cobaltate-coated high-nickel ternary positive electrode material and preparation method thereof
  • Lithium cobaltate-coated high-nickel ternary positive electrode material and preparation method thereof
  • Lithium cobaltate-coated high-nickel ternary positive electrode material and preparation method thereof

Examples

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Example Embodiment

[0042] Example 1

[0043] This embodiment provides a lithium cobalt oxide coated high nickel ternary cathode material, and the preparation process is specifically as follows.

[0044] (1) Put the nano cobalt tetroxide (D50: 20-50nm) and 811 nickel cobalt manganese ternary precursor into the high mixer at a mass ratio of 0.05:1, and put the lithium hydroxide according to (nanometer cobalt tetroxide mole number + 811 nickel cobalt manganese high The number of moles of nickel ternary precursor): The number of moles of lithium hydroxide is 1.05:1 into the high-mixer, that is, 0.5kg of nano-cobalt tetroxide, 10kg of 811 nickel-cobalt-manganese ternary precursor and 4.87kg of lithium hydroxide are put into the high-mixer. The machine is then mixed at a high speed of 550r / min for 20min;

[0045] (2) Put the uniformly mixed powder in a box furnace with an oxygen content> 95% oxygen atmosphere, heat up to 800°C at a heating rate of 5°C / min, keep it for 13 hours, and sinter the product;

[004...

Example Embodiment

[0047] Example 2

[0048] This embodiment provides a lithium cobalt oxide coated high nickel ternary cathode material, and the preparation process is specifically as follows.

[0049] (1) Put nano cobalt tetroxide (D50: 20-50nm) and 811 nickel cobalt manganese ternary precursor into the high mixer at a mass ratio of 0.1:1, and put lithium hydroxide according to (nanometer cobalt tetroxide mole number + 811 nickel cobalt manganese high The number of moles of nickel ternary precursor): The number of moles of lithium hydroxide is 1.05:1 into the high-mixer, that is, 1.0kg nano-cobalt tetroxide, 10kg 811 nickel-cobalt-manganese ternary precursor and 4.96kg lithium hydroxide are put into the high-mixer. The machine is then mixed at a high speed of 550r / min for 20min;

[0050] (2) Put the uniformly mixed powder in a box furnace with an oxygen content> 95% oxygen atmosphere, heat up to 800°C at a heating rate of 5°C / min, keep it for 13 hours, and sinter the product;

[0051] (3) The sintere...

Example Embodiment

[0052] Example 3

[0053] This embodiment provides a lithium cobalt oxide coated high nickel ternary cathode material, and the preparation process is specifically as follows.

[0054] (1) Put nano cobalt tetroxide (D50: 20-50nm) and 811 nickel cobalt manganese ternary precursor into the high mixer at a mass ratio of 0.15:1, and put lithium hydroxide according to (nanometer cobalt tetroxide mole number + 811 nickel cobalt manganese high The number of moles of nickel ternary precursor): The number of moles of lithium hydroxide is 1.05:1 into the high mixer, that is, 1.5kg of nano cobalt tetroxide, 10kg of 811 nickel cobalt manganese ternary precursor and 5.05kg of lithium hydroxide are put into the high mixing machine. The machine is then mixed at a high speed of 550r / min for 20min;

[0055] (2) Put the uniformly mixed powder in a box furnace with an oxygen content> 95% oxygen atmosphere, heat up to 800°C at a heating rate of 5°C / min, keep it for 13 hours, and sinter the product;

[00...

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Abstract

The invention relates to a lithium cobaltate-coated high-nickel ternary positive electrode material and a preparation method thereof. The preparation method comprises the following steps of: mixing a high-nickel ternary precursor, nano cobaltosic oxide, and a lithium source, and calcining the mixture at 750-820 degrees centigrade to obtain the lithium cobaltate-coated high-nickel ternary positive electrode material, wherein the mass ratio of the nano cobaltosic oxide to the high-nickel ternary precursor is 0.05 to 0.2:1. The surface of the high-nickel ternary positive electrode material is uniformly coated with a layer of lithium cobaltate material, thereby protecting the reticular structure of the high-nickel ternary positive electrode material, reducing the nickel-lithium ion mixing, improving the electronic conduction, the cycle performance and the rate performance of the material, additionally avoiding direct contact between the surface of high-nickel ternary positive electrode material and the air, reducing the water absorption of the material and the formation of surface lithium hydroxide and lithium carbonate, reducing residual alkali on the surface of the material, and optimizing the processing properties of the material.

Description

Technical field [0001] The invention belongs to the technical field of battery materials, and specifically relates to a lithium cobalt oxide coated high nickel ternary positive electrode material and a preparation method thereof. Background technique [0002] Nowadays, there are more coating processes in which two different cathode materials are coated with each other to obtain a composite material with the respective properties of the two materials; the mutual coating materials used include lithium iron lithium oxide and titanium phosphate Lithium, lithium manganate, lithium cobalt oxide, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminate, etc.; this kind of coating methods are also different, some simply mix and coat the two finished materials, and some In the preparation process, it is mixed and coated and then sintered. In this type of coating process, the excellent properties of the two materials can be combined to a certain extent, but some properties ar...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525
CPCH01M4/364H01M4/505H01M4/525Y02E60/10
Inventor 黄宏威张军黄华东李鹏飞
Owner RUYUAN DONGYANGGUANG MAGNETIC MATERIAL
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