High-tap-density multi-element oxide precursor and preparation method and preparation system thereof

A technology of tap density and preparation system, applied in chemical instruments and methods, nickel compounds, chemical/physical processes, etc., can solve problems such as high energy density of lithium-ion batteries and low tap density of materials, and achieve good results , Strong raw material adaptability, effect of increasing particle size and density

CN112919552AActive Publication Date: 2021-06-08CENT SOUTH UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2021-06-08

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Abstract

The invention relates to the technical field of powder material preparation methods, in particular to a high-tap-density multi-element oxide precursor and a preparation method and a preparation system thereof. The preparation method comprises the steps that S1, metal salt containing crystal water is added into a liquid feeding device according to the stoichiometric ratio of all metal elements in the multi-element oxide to be stirred, heated and melted, and sub-molten salt liquid is obtained; S2, the sub-molten salt liquid is atomized through a two-fluid atomizer to form atomized liquid drops, and the atomized liquid drops are brought into a fluidized bed pyrolyzing furnace through compressed gas for pyrolysis; and S3, a pyrolysis product is collected in the step S2 through a dust collector to obtain the high-tap-density multi-element oxide precursor. According to the method, sub-molten salt liquid, double-fluid atomization and fluidized bed pyrolysis are combined, efficient preparation of the high-tap-density multi-element oxide precursor is achieved, and the precursor is uniform in element distribution, uniform in particle size, high in purity and good in spherical morphology.
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Description

technical field

[0001] The invention relates to the technical field of powder material preparation methods, in particular to a high tap density multi-component oxide precursor, a preparation method and a preparation system thereof. Background technique

[0002] With the intensification of the greenhouse effect and the depletion of fossil energy, the development of new energy has gradually become a focus of attention. Due to a series of advantages such as high energy density, long cycle life, and good safety performance, lithium-ion batteries are widely used in portable electronic products, energy storage devices, and new energy vehicles. However, in order to meet the demands of new energy vehicle cruising range, lithium-ion batteries are required to have higher energy density. The layered structure nickel-based multi-component cathode material (LiNixCoyMzO2, M=Mn, Al; x>0.6) has the advantages of high specific capacity and low cost, and is considered to be one of the cat...

Examples

Embodiment 1

[0038] This embodiment adopts as figure 1 The preparation system shown prepares the NCM ternary positive electrode precursor, specifically including the following steps:

[0039]Step 1 Furnace preheating: Turn on the heater 5 to raise the temperature to 800°C, then turn on the blower 7 to filter the air through the filter 6 and preheat the cavity of the fluidized bed 2 through the fluidization gas inlet 4, and the cavity of the fluidized bed 2 The temperature in the body is controlled at 800°C;

[0040] Step 2 heating and melting: nickel chloride hexahydrate, cobalt chloride hexahydrate, and manganese chloride tetrahydrate weigh a total of 500g according to a certain stoichiometric ratio, place them in the liquid delivery device 8, heat to 60-250°C, and Stir while melting to form a uniform sub-molten salt liquid;

[0041] Step 3 Spray pyrolysis: After the spray pyrolysis device is running stably, the sub-molten salt liquid obtained in step 2 is injected into the dual-fluid a...

Embodiment 2

[0047] This embodiment adopts as figure 1 The preparation system shown prepares the NCM622 ternary cathode precursor, which specifically includes the following steps:

[0048] Step 1 Furnace preheating: Turn on the heater 5 to raise the temperature to 650-950°C, then turn on the blower 7 to filter the air through the filter 6 and preheat the cavity of the fluidized bed 2 through the fluidizing gas inlet 4, and the fluidized bed 2. The temperature in the cavity is controlled at 650-950°C;

[0049] Step 2 Heating and melting: Nickel chloride hexahydrate, cobalt chloride hexahydrate, and manganese chloride tetrahydrate are weighed in a stoichiometric ratio of 0.6:0.2:0.2 to weigh a total of 500g, placed in liquid delivery device 8, and heated to 125°C , stirring while melting to form a uniform sub-molten salt liquid;

[0050] Step 3 Spray pyrolysis: After the spray pyrolysis device is running stably, the sub-molten salt liquid obtained in step 2 is injected into the dual-fluid ...

Embodiment 3

[0056] This embodiment adopts as figure 1 The preparation system shown prepares Al-doped NCM811 ternary cathode precursor, which specifically includes the following steps:

[0057] Step 1 Furnace preheating: Turn on the heater 5 to raise the temperature to 850°C, then turn on the blower 7 to filter the air through the filter 6 and preheat the cavity of the fluidized bed 2 through the fluidization gas inlet 4, and the cavity of the fluidized bed 2 The temperature in the body is controlled at 850°C;

[0058] Step 2 Heating and melting: Nickel chloride hexahydrate, cobalt chloride hexahydrate, and manganese chloride tetrahydrate are weighed in a stoichiometric ratio of 0.85:0.1:0.05, and a total of 500g is weighed, placed in the liquid delivery device 8, and heated to 150°C , stirring while melting to form a uniform sub-molten salt liquid;

[0059] Step 3 Spray pyrolysis: After the spray pyrolysis device is running stably, the sub-molten salt liquid obtained in step 2 is inject...