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Method for preparing cobalt oxide coated ternary positive electrode material

A cathode material and cobalt oxide technology, which is applied in the field of preparation of cobalt oxide-coated ternary cathode materials, can solve the problems of increased irreversible capacity, morphology damage, and unfavorable commercial utilization of materials, and achieves improved rate cycle performance, The effect of alleviating the interface reaction

Inactive Publication Date: 2019-05-03
ZHEJIANG FOREVER NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such materials still face many problems in practical applications: cation mixing causes the irreversible capacity of the material to increase; the generation of non-electrochemically active NiO causes a rapid decline in battery capacity; the dissolution of metal ions shortens the cycle life of the material; oxygen release Caused battery safety issues; surface impurities prevent lithium ion diffusion and interfacial charge transport, destroying the cycle stability and rate performance of the material
However, it needs high-speed stirring, and the stirring speed of general conventional high-speed stirring is above 1000rpm, and the morphology of high-nickel positive electrode material will be destroyed under such high-speed stirring, thereby affecting performance; High, the molar coating amount is in the range of 2% to 6%, so the sintering temperature is high, which is not conducive to energy saving and cost control, and the excessive coating amount also affects the performance of high-nickel cathode materials, which need to use nanometer Grade materials have high requirements on the particles of cobalt compounds, which is not conducive to commercial utilization

Method used

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  • Method for preparing cobalt oxide coated ternary positive electrode material
  • Method for preparing cobalt oxide coated ternary positive electrode material
  • Method for preparing cobalt oxide coated ternary positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 0.0115g of cobalt oxalate and 10g of LiNi 0.8 co 0.15 Al 0.05 o 2 Put the material into the beaker, the particle size of cobalt oxalate is 100 μm ~ 300 μm, then, at a speed of 300 rpm (rev / min), perform magnetic stirring for 30 minutes to mix evenly, and then transfer the evenly mixed phase to the ceramic material boat, Move the material boat into a tube furnace, raise the temperature to about 350°C in an air atmosphere, and carry out low-temperature solid-phase calcination treatment for 3 hours. After the end, a small amount of Co is obtained after natural cooling. 3 o 4 coated LiNi 0.8 co 0.15 Al0.05 o 2 material, here for the obtained material Co 3 o 4 Coating amount is LiNi 0.8 co 0.15 Al 0.05 o 2 About 0.1wt% can also be obtained indirectly from the addition of cobalt oxalate and raw material LiNi 0.8 co 0.15 Al 0.05 o 2 The ratio of the amount of material can basically also explain that only a small amount of Co in the material obtained in th...

Embodiment 2

[0027] Weigh 0.0575g of cobalt oxalate and 10g of LiNi 0.8 co 0.15 Al 0.05 o 2 Put the material into the beaker, the particle size of cobalt oxalate is 100 μm ~ 300 μm, then, at a speed of 300 rpm (rev / min), perform magnetic stirring for 30 minutes to mix evenly, and then transfer the evenly mixed phase to the ceramic material boat, Move the material boat into a tube furnace, raise the temperature to about 350°C in an air atmosphere, and carry out low-temperature solid-phase calcination treatment for 3 hours. After the end, a small amount of Co is obtained after natural cooling. 3 o 4 coated LiNi 0.8 co 0.15 Al 0.05 o 2 material, here for the obtained material Co 3 o 4 Coating amount is LiNi 0.8 co 0.15 Al 0.05 o 2 0.5wt% or so.

[0028] Similarly, the small amount of Co obtained in this example 3 o 4 coated LiNi 0.8 co 0.15 Al 0.05 o 2 Material, there is no obvious cobalt oxide diffraction peak in the XRD spectrum, indicating that its coating amount is sma...

Embodiment 3

[0030] Weigh 0.0221g of cobalt acetate, 10g of LiNi 0.8 co 0.15 Al 0.05 o 2 Put the material into the beaker, the particle size of cobalt acetate is 100 μm ~ 200 μm, then stir it with a magnetic force at a speed of 200 rpm for 60 minutes to mix evenly, then transfer the evenly mixed phase to a ceramic material boat, and move the material boat into a tube furnace calcination at 300°C for 4h in an air atmosphere, and after the end, the cobalt oxide-coated LiNi was obtained after natural cooling. 0.8 co 0.15 Al 0.05 o 2 material, where the coating amount of cobalt oxide is cobalt oxide coated LiNi 0.8 co 0.15 Al 0.05 o 2 About 0.2 wt% of the mass of the material.

[0031] Similarly, the cobalt oxide coated LiNi obtained in this example 0.8 co 0.15 Al 0.05 o 2 There is no obvious cobalt oxide diffraction peak in the XRD pattern of the material, which also shows the characteristics of its small amount of coating, while the shape of the material shown in the SEM image ...

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Abstract

The invention relates to a method for preparing a cobalt oxide coated ternary positive electrode material, and belongs to the technical field of battery positive electrode materials. The problem to besolved is how to achieve a high rate performance by lowering the sintering temperature and a coating amount. The method for preparing the cobalt oxide coated ternary positive electrode material comprises placing a cobalt source and a high-nickel ternary positive electrode material in a vessel, stirring and mixing the two objects at a speed less than or equal to 700 rpm to obtain a corresponding mixture; in the air or oxygen atmosphere, subjecting the mixture to low-temperature solid-phase sintering at 250 to 550 degrees centigrade to obtain the corresponding cobalt oxide coated ternary positive electrode material, wherein the coating amount of the cobalt oxide is 0.1 wt% to 1.0 wt% of the mass of the ternary positive electrode material. The method can achieve a low cobalt oxide coating effect and achieves the rate and cycle performance of the material under high-voltage conditions.

Description

technical field [0001] The invention relates to a preparation method of a cobalt oxide-coated ternary positive electrode material, belonging to the technical field of battery positive electrode materials. Background technique [0002] Lithium-ion batteries are widely used in the field of new energy vehicles due to their high energy density, long cycle life, high operating voltage, low self-discharge and environmental friendliness. As a new type of transportation, new energy vehicles are concerned by consumers in terms of battery life, charging efficiency, safety and cost, all of which are closely related to the performance of lithium-ion power batteries. With the extensive application of new energy vehicles, the market has put forward higher requirements for the performance of lithium-ion power batteries. [0003] As the core component of lithium-ion power battery, battery electrode material directly determines its electrochemical performance. Commercial anode materials ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/52H01M4/525H01M10/0525
CPCY02E60/10
Inventor 邵俐魏日兵唐俊贲晴吴媛黄恳
Owner ZHEJIANG FOREVER NEW ENERGY TECH CO LTD
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