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Positive electrode material, preparation method thereof and lithium ion battery

A technology of positive electrode materials and active materials, applied in the field of positive electrode materials and their preparation, can solve problems such as cladding layer and material surface delamination, adverse effects on battery electrochemical performance, limited increase in energy density, etc., to achieve improved surface stability performance, good chemical stability, and improved cycle performance

Pending Publication Date: 2022-05-06
SHENZHEN CITY BATTERY NANOMETER TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, under the existing conditions, the energy density of the battery cell is limited, that is, the specific capacity of the positive electrode material itself needs to be increased; another point is the structural stability of the battery during cycling, especially the structural stability of cycling under high temperature conditions , with the increase of nickel content, the structural instability of the material itself will increase, which will have an adverse effect on the electrochemical performance of the battery and cause safety issues
The fast ion conductor material selected by the conventional fast ion conductor coating technology is difficult to prepare and has an unstable structure. At the same time, it will exchange for circulation at the cost of reducing the capacity of the material, and it is difficult to achieve uniform coating on the surface of the material, and it is easy to exist. The problem of delamination between the coating and the surface of the material causes the surface coating of the material to fall off easily during the charging cycle, resulting in failure of the battery cycle diving performance

Method used

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  • Positive electrode material, preparation method thereof and lithium ion battery
  • Positive electrode material, preparation method thereof and lithium ion battery
  • Positive electrode material, preparation method thereof and lithium ion battery

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preparation example Construction

[0082] In the second aspect, the present application provides a method for preparing a cathode material, Figure 1 The flow diagram of the preparation method of the cathode material provided for the embodiment of the application is as follows: Figure 1 As shown, the preparation method comprises the following steps S10 to S20:

[0083] S10, mixing the active material matrix, lithium nitride and anhydrous lithium chloride evenly to obtain the mixture;

[0084] S20, heat treat the mixture in a protective atmosphere to obtain a positive electrode material.

[0085] In the above scheme, lithium nitride and anhydrous lithium chloride form Li on the surface of the active material matrix 3 N cladding, LiCl cladding and Li 9 N 2 Cl 3 At least two of the cladding, Li 3 N cladding, LiCl cladding and Li 9 N 2 Cl 3 The composite of coating layer can realize the effect of multiple coating. However, in the prior art, multi-step processing is required to realize the doping and coating process. Fir...

Embodiment 1

[0121] (1) Dissolve the Ni source, Co source and Mn source according to the molar ratio Ni ∶ Co: Mn = 0.83 ∶ 0.11 ∶ 0.06 to prepare an aqueous solution of 2.0mol / l, prepare 8mol / L sodium hydroxide solution and 2mol / L ammonia solution, and carry out coprecipitation reaction to synthesize the precursor.

[0122] (2) The obtained precursor is fully mixed with excess LiOH to obtain the first mixture. The first mixture is placed in the atmosphere of pure oxygen, the furnace pressure is controlled at 10Pa, the temperature is raised to 800 ℃ at the heating rate of 1.5 ℃ / min, and the sintering treatment is continued for 9 hours. Lini is obtained after natural cooling 0.83 Co 0.11 Mn 0.06 O 2 Active material matrix. Figure 2A 、 Figure 2B A scanning electron microscope photograph of the cathode material of embodiment 1 of the present application, such as Figure 2A 、 Figure 2B As shown in the figure, it can be seen that the outline of the spherical primary particles is clear, and the s...

Embodiment 2

[0128] Different from embodiment 1, (3) use a high mixer to mix the above lini 0.83 Co 0.11 Mn 0.06 O 2 Active material matrix and lithium nitride (Li 3 N) Powder and anhydrous LiCl powder (Li 3 The molar ratio of n to LiCl is 2:3) and the second mixture is obtained by uniformly mixing for 1H according to the mass ratio of 100:1. The second mixture is put into a crucible for heat treatment, sintered into nitrogen atmosphere, heated to 700 ℃ at the rate of 3 ℃ / min, heat treated for 5 hours, and cooled with the furnace to obtain the cathode material.

[0129] The cathode material of embodiment 2 includes an active material matrix lini 0.83 Co 0.11 Mn 0.06 O 2 And a coating layer formed on the surface of the active material substrate, which includes Li 3 N and LiCl, the mass ratio of active material matrix to coating layer is 100:1, and the thickness of coating layer is 2nm. The cathode material includes secondary particles composed of a plurality of primary particles. The average ...

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Abstract

The invention relates to the field of lithium ion batteries, and provides a positive electrode material, a preparation method thereof and a lithium ion battery, the positive electrode material comprises an active substance and a coating layer, the chemical general formula of the active substance is LiaNixCoyMnzO2, a is more than or equal to 1.0 and less than 1.1, x is more than or equal to 0.80 and less than 1, y is more than 0 and less than 0.20, z is more than 0 and less than 0.10, the coating layer is formed on at least part of the surface of the active substance, and the coating layer comprises at least two of Li3N, LiCl and Li9N2Cl3. The active substance of the positive electrode material provided by the invention has high capacity and excellent charge-discharge reversibility, and the cycle performance of the positive electrode material under a high-temperature condition is improved. And the coating layer is formed on the surface of the active substance, so that the reaction of the active substance and the electrolyte for generating gas can be reduced, and the thermal stability of the active substance in the circulation process can be improved.

Description

technical field [0001] The application relates to the field of lithium ion batteries, in particular to a cathode material and a preparation method thereof, and a lithium ion battery. Background technology [0002] The increasing energy consumption in modern society and its high attention to environmental health have led to the soaring demand for energy storage in various fields, from portable electronic devices to large-scale storage applications. In recent years, with the maturity of lithium-ion technology, large-size lithium-ion batteries are more widely used in electric vehicles and aircraft, including LiCoO 2 Because of its high rate discharge performance, simple process route and excellent cycle performance, it is used in 3C products, but it is affected by the price of metal cobalt, the cost is high and it is difficult to be used in power batteries; Lithium iron phosphate material has become the first choice of power battery materials in recent years because of its low cost,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/36H01M4/525H01M10/0525H01M10/42
CPCH01M4/624H01M4/628H01M4/525H01M4/366H01M10/4235H01M10/0525H01M2004/028H01M2004/021Y02E60/10
Inventor 贾孝波郑玉严武渭杨顺毅黄友元
Owner SHENZHEN CITY BATTERY NANOMETER TECH
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