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

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

CN109713262AInactive Publication Date: 2019-05-03ZHEJIANG FOREVER NEW ENERGY TECH CO LTD
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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

Patent Timeline
03 May 2019
Publication
CN109713262A
IPC
H01M4/36; H01M4/52; H01M4/525; H01M10/0525
CPC
Y02E60/10
Inventors
邵俐; 魏日兵