Lithium-ion battery positive electrode material and preparation method thereof, lithium-ion battery positive electrode, lithium-ion battery and electrical equipment

A technology for lithium ion batteries and positive electrode materials, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of difficulty in further improving material stability, the coating layer is not stable enough, the coating layer is unstable, etc. Good stability and high temperature stability, low cost, good uniformity

Active Publication Date: 2020-06-26
SOUNDON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, boron oxide and phosphorus pentoxide are easily dissolved in the electrolyte during the battery cycle, which makes the coating layer unstable and easy to fall off, making it difficult to further improve the stability of the material
Therefore, it is necessary to solve the problem of unstable cladding while achieving low temperature cladding

Method used

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  • Lithium-ion battery positive electrode material and preparation method thereof, lithium-ion battery positive electrode, lithium-ion battery and electrical equipment
  • Lithium-ion battery positive electrode material and preparation method thereof, lithium-ion battery positive electrode, lithium-ion battery and electrical equipment
  • Lithium-ion battery positive electrode material and preparation method thereof, lithium-ion battery positive electrode, lithium-ion battery and electrical equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Weigh 75g Te 2 o 3 , 20g Al 2 o 3 and 5g TiO 2 Powder, mixed evenly, sintered at 1000 ℃ for 2h. Then the material was quenched in water and crushed to about D50=0.8 μm to obtain the cladding layer material.

[0051] Weigh LiNi 0.8 co 0.1 mn 0.1 o 2 100 g of material, 0.05 g of the above coating material. The two were placed in a planetary ball mill and mixed evenly, and then 2 Sintered at 400°C for 8h under atmosphere. Finally, after cooling to room temperature with the furnace, the material is taken out, crushed and sieved to obtain the lithium ion cathode material.

[0052] figure 1 It is the SEM image of the lithium ion cathode material obtained in Example 1. It can be seen from the figure that there is an obvious coating layer on the surface of the material, and the distribution of the coating layer is very uniform, and there is almost no bare or agglomerated area of ​​the coating layer.

[0053] figure 2 The XRD diffraction pattern of the lithium-io...

Embodiment 2

[0059] Weigh 30g Sb 2 o 3 , 10g Bi 2 o 3 , 35g SnO 2 , 25g ZnO mixed evenly, and sintered at 1200 ℃ for 4h. Then the material is water-quenched and crushed to about D50=0.6 μm to obtain the cladding layer material.

[0060] Weigh LiNi 0.9 co 0.05 Al 0.05 o 2 100g of material, 0.1g of the above coating material. The two were placed in a planetary ball mill and mixed evenly, and then sintered at 250°C for 20h in an air atmosphere. Finally, after cooling to room temperature with the furnace, the material is taken out, crushed and sieved to obtain the lithium ion cathode material.

Embodiment 3

[0064] Weigh 40g LiF, 10g AlF 3 , 16g CaF 2 and 34g ZrF 4 After mixing evenly, sinter at 1100 °C for 1 h. Then the material is water-quenched and crushed to about D50=1 μm to obtain the cladding layer material.

[0065] Weigh LiNi 0.5 co 0.2 mn 0.3 o 2 100g of material, 1g of the above cladding layer material. The two were placed in a planetary ball mill and mixed evenly, and then sintered at 450 ° C for 10 h in an air atmosphere. Finally, after cooling to room temperature with the furnace, the material is taken out, crushed and sieved to obtain the lithium ion cathode material.

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PUM

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Abstract

The invention provides a lithium ion battery positive electrode material and a preparation method thereof, a lithium ion battery positive electrode, a lithium ion battery and an electric device. The lithium ion battery positive electrode material comprises a ternary positive electrode material and a coating layer material coating the ternary positive electrode material, the coating layer materialcomprises the following raw materials of a coating A, a coating B and a coating C, and the coating A, the coating B and the coating C comprise one or more of oxides, fluorides, carbonates and oxalatesof the corresponding elements. The preparation method comprises the following steps of mixing the coating A, the coating B and the coating C, and sintering to obtain the coating layer material; and mixing the coating layer material and the ternary positive electrode material, and sintering in an oxygen-containing atmosphere. The lithium ion battery positive electrode is made of the lithium ion battery positive electrode material. The lithium ion battery includes the lithium ion battery positive electrode. The electric device comprises the lithium ion battery or is powered by the lithium ion battery. According to the lithium ion battery positive electrode material provided by the invention, the coating layer is stable, and the cycle performance is good.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery positive electrode material and a preparation method thereof, a lithium ion battery positive electrode, a lithium ion battery and electrical equipment. Background technique [0002] Li-ion battery ternary cathode material LiNi 1-x-y co x m y o 2 , has the advantages of high specific capacity and low price. The specific capacity of ternary materials is closely related to the nickel content. As people have higher and higher requirements for the energy density of lithium-ion batteries, the nickel content of ternary materials is also increasing. However, as the nickel content of the ternary material increases, the cycle stability and high temperature stability of the material decrease. H of high nickel material during cycling 2 -H 3 The phase transition leads to a sharp contraction of the unit cell, which brings problems of particle fragmentation and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/62H01M4/131H01M10/0525
CPCH01M4/131H01M4/505H01M4/525H01M4/624H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 邓多罗桂唐泽勋商士波唐福利
Owner SOUNDON NEW ENERGY TECH CO LTD
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