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

Active Publication Date: 2021-06-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Spray pyrolysis is a fast multiphase reaction process. The rapid evaporation of the solvent in the pyrolysis process will impact the primary particles, so that the prepared materials are often porous or hollow. The primary particles are small, resulting in low tap density of the material, which is difficult to meet Lithium-ion battery high energy density requirements

Method used

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

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Effect test

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...

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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.

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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525B01J6/00
CPCC01G53/006H01M4/505H01M4/525H01M10/0525B01J6/008C01P2006/11C01P2004/32Y02E60/10
Inventor 王接喜郭利生倪一鸣戴雨晴尤编政王志兴李新海郭华军彭文杰颜果春胡启阳
Owner CENT SOUTH UNIV
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