阅读说明：本技术 降低锂离子电池正极材料前驱体中碳含量的装置及方法 (Device and method for reducing carbon content in precursor of lithium ion battery anode material ) 是由 许开华 师树临 陆卫军 陈永安 于 2021-09-27 设计创作，主要内容包括：本发明公开了一种降低锂离子电池正极材料前驱体中碳含量的装置,包括依次连接的闪蒸加料器(6)、闪蒸主机(1)、鼓风机(3)、储气罐(4)、制氮机(5),还包括闪蒸进风加热器(2)、闪蒸旋风分离器(7),闪蒸进风加热器(2)与鼓风机(3)连接,闪蒸主机(1)安装有引风机(8),闪蒸旋风分离器(7)与引风机(8)连接。降低方法包括：打开引风机、鼓风机、制氮机；将闪蒸旋风分离器中固体物料冷却,开启闪蒸进风加热器、闪蒸加料器；将闪蒸主机中的湿物料烘干后,关闭闪蒸加料器,停止加热闪蒸进风加热器和闪蒸主机,依次关闭鼓风机、引风机、制氮机,停止冷却。本发明使成品中碳含量降低200-400ppm。(The invention discloses a device for reducing carbon content in a precursor of a lithium ion battery anode material, which comprises a flash evaporation feeder (6), a flash evaporation main machine (1), an air blower (3), an air storage tank (4) and a nitrogen making machine (5) which are sequentially connected, and further comprises a flash evaporation air inlet heater (2) and a flash evaporation cyclone separator (7), wherein the flash evaporation air inlet heater (2) is connected with the air blower (3), the flash evaporation main machine (1) is provided with an induced draft fan (8), and the flash evaporation cyclone separator (7) is connected with the induced draft fan (8). The reduction method comprises the following steps: opening a draught fan, a blower and a nitrogen making machine; cooling the solid material in the flash cyclone separator, and starting a flash inlet air heater and a flash feeder; after drying the wet materials in the flash evaporation host machine, closing the flash evaporation feeder, stopping heating the flash evaporation air inlet heater and the flash evaporation host machine, sequentially closing the air blower, the draught fan and the nitrogen making machine, and stopping cooling. The invention reduces the carbon content in the finished product by 200-400 ppm.)

1. The device for reducing the carbon content in the precursor of the lithium ion battery anode material is characterized by comprising a flash evaporation host (1), a flash evaporation air inlet heater (2), an air blower (3), an air storage tank (4), a nitrogen making machine (5), a flash evaporation feeder (6) and a flash evaporation cyclone separator (7), wherein the flash evaporation host (1) is connected with the air blower (3), the air blower (3) is connected with the air storage tank (4) through a pipeline provided with a valve, the air storage tank (4) is connected with the nitrogen making machine (5) through a pipeline provided with a valve, the flash evaporation air inlet heater (2) is connected with the air blower (3), and a pipeline between the air blower (3) and the air storage tank (4) penetrates through the flash evaporation air inlet heater (2); flash distillation charging means (6) with flash distillation host computer (1) are connected, draught fan (8) are installed in flash distillation host computer (1), flash distillation cyclone (7) with the air outlet of draught fan (8) is connected.

2. The device for reducing the carbon content in the lithium ion battery cathode material precursor according to claim 1, wherein the flash feeder (6) is provided with a flash feed inlet, and the flash feed inlet provided on the flash feeder (6) is connected with the flash host (1).

3. The apparatus for reducing the carbon content in the lithium ion battery cathode material precursor according to claim 2, wherein the flash feeder (6) is provided with a flash feeding port located at the top end of the flash feeder (6).

4. The apparatus for reducing the carbon content in the lithium ion battery positive electrode material precursor according to claim 1, wherein the blower (3) is connected with the lower part of the flash evaporation main machine (1).

5. The device for reducing the carbon content in the lithium ion battery anode material precursor according to claim 1, wherein an induced draft fan (8) is installed at the upper part of the flash evaporation main machine (1).

6. A method for reducing the carbon content in the lithium ion battery positive electrode material precursor is characterized by comprising the following steps of:

step (I): opening the induced draft fan (8) and the blower (3) to enable the flash evaporation host (1) to work under micro negative pressure;

step (II): starting a nitrogen making machine (5) to enable nitrogen to flow through a flash evaporation main machine (1) through a blower (3);

step (three): cooling the solid material in the flash cyclone separator (7), and starting the flash air inlet heater (2);

step (IV): starting a flash evaporation feeder (6) and adding the wet material into a flash evaporation host (1);

step (V): after drying wet materials in the flash evaporation main machine (1), closing the flash evaporation feeder (6), stopping heating the flash evaporation air inlet heater (2) and the flash evaporation main machine (1), closing the air blower (3), the draught fan (8) and the nitrogen making machine (5) in sequence, and stopping cooling solid materials in the flash evaporation cyclone separator (7).

7. The method for reducing the carbon content in the lithium ion battery cathode material precursor according to claim 6, wherein the purity of the nitrogen in the nitrogen generator (5) is greater than or equal to 99.5%, and the pressure of the nitrogen in the gas storage tank (4) is 0.3MPa-0.5 MPa.

8. The method for reducing the carbon content in the precursor of the lithium ion battery cathode material according to claim 6, wherein in the step (III), the temperature of the flash evaporation air inlet heater (2) is increased to 90-180 ℃.

Technical Field

The invention belongs to the technical field of precursors of lithium ion battery anode materials, and particularly relates to a device and a method for reducing the carbon content in the precursors of the lithium ion battery anode materials.

Background

Carbon-containing impurities are inevitably introduced in the production process of the precursor of the ternary cathode material of the lithium ion battery. In the production process of the battery anode material precursor, when the existing flash evaporation dryer is used for drying, air needs to be blown in, the temperature is usually 80-150 ℃, and thermodynamic calculation shows that carbon dioxide and nickel-cobalt-manganese hydroxide in the air can react to generate carbonate in the temperature range, so that the carbon content in the finished product is increased.

Disclosure of Invention

Aiming at the problem that carbon-containing impurities are easily introduced during flash evaporation drying in the prior art, the invention provides the improved device and the method for reducing the carbon content in the precursor of the lithium ion battery anode material, and the device and the method are favorable for reducing the carbon-containing impurities in a flash evaporation dried finished product.

The invention adopts the following technical scheme:

the device for reducing the carbon content in the precursor of the lithium ion battery anode material is characterized by comprising a flash evaporation host (1), a flash evaporation air inlet heater (2), an air blower (3), an air storage tank (4), a nitrogen making machine (5), a flash evaporation feeder (6) and a flash evaporation cyclone separator (7), wherein the flash evaporation host (1) is connected with the air blower (3), the air blower (3) is connected with the air storage tank (4) through a pipeline provided with a valve, the air storage tank (4) is connected with the nitrogen making machine (5) through a pipeline provided with a valve, the flash evaporation air inlet heater (2) is connected with the air blower (3), and a pipeline between the air blower (3) and the air storage tank (4) penetrates through the flash evaporation air inlet heater (2); flash distillation charging means (6) with flash distillation host computer (1) are connected, draught fan (8) are installed in flash distillation host computer (1), flash distillation cyclone (7) with the air outlet of draught fan (8) is connected.

According to foretell device of reducing carbon content in lithium ion battery cathode material precursor, its characterized in that, flash distillation charging means (6) are equipped with the flash distillation charge door, the flash distillation charge door that flash distillation charging means (6) were equipped with flash distillation host computer (1) are connected.

The device for reducing the carbon content in the precursor of the lithium ion battery anode material is characterized in that a flash evaporation feed inlet arranged on the flash evaporation feeder (6) is positioned at the top end of the flash evaporation feeder (6).

The device for reducing the carbon content in the precursor of the lithium ion battery anode material is characterized in that the blower (3) is connected with the lower part of the flash evaporation main machine (1).

The device for reducing the carbon content in the precursor of the lithium ion battery anode material is characterized in that an induced draft fan (8) is installed on the upper portion of the flash evaporation main machine (1).

The method based on the device for reducing the carbon content in the precursor of the lithium ion battery cathode material is characterized by comprising the following steps:

step (I): opening the induced draft fan (8) and the blower (3) to enable the flash evaporation host (1) to work under micro negative pressure;

step (II): starting a nitrogen making machine (5) to enable nitrogen to flow through a flash evaporation main machine (1) through a blower (3);

step (three): cooling the solid material in the flash cyclone separator (7), and starting the flash air inlet heater (2);

step (IV): starting a flash evaporation feeder (6) and adding the wet material into a flash evaporation host (1);

step (V): after drying wet materials in the flash evaporation main machine (1), closing the flash evaporation feeder (6), stopping heating the flash evaporation air inlet heater (2) and the flash evaporation main machine (1), closing the air blower (3), the draught fan (8) and the nitrogen making machine (5) in sequence, and stopping cooling solid materials in the flash evaporation cyclone separator (7).

The method for reducing the carbon content in the precursor of the lithium ion battery anode material is characterized in that the purity of nitrogen in the nitrogen making machine (5) is more than or equal to 99.5%, and the pressure of the nitrogen in the gas storage tank (4) is 0.3MPa-0.5 MPa.

The method for reducing the carbon content in the precursor of the lithium ion battery anode material is characterized in that in the third step, the temperature of the flash evaporation air inlet heater (2) is increased to 90-180 ℃.

The invention has the beneficial technical effects that: the device is convenient to refit and has obvious effect, and the nitrogen gas supply system is connected with the flash evaporation drying system to replace carrier gas in the flash evaporation drying system, so that carbon-containing impurities introduced in the drying process of the battery material precursor are reduced, and the quality of the product is improved. The flash machine needs to blow air in the drying process so that the materials are conveyed from the middle lower part of the flash machine to the top of the flash machine. The device of the invention changes the gas blown in by the flash evaporation machine from air into nitrogen gas by connecting the gas storage tank of the nitrogen making machine with the blower of the flash evaporation machine, thereby forming inert atmosphere protection. The purity of the nitrogen is not lower than 99.5 percent, and the total pressure of a nitrogen supply system is 0.3-0.5 MPa. Under the condition that other conditions are not changed, the reaction of the alkalescent material and the carbon dioxide can be effectively reduced, and the content of carbon impurities in the product is reduced. The invention changes the gas input by the blower from air to high-purity nitrogen gas during flash evaporation, and forms inert gas atmosphere protection in the flash evaporation tower, thereby avoiding introducing impurity carbon in the flash evaporation process, and reducing the carbon content in the finished product by 200-400 ppm.

Drawings

FIG. 1 is a schematic view of the structure of the apparatus of the present invention.

Detailed Description

Referring to fig. 1, the device for reducing the carbon content in the precursor of the lithium ion battery anode material comprises a flash evaporation main machine 1, a flash evaporation air inlet heater 2, an air blower 3, an air storage tank 4, a nitrogen making machine 5, a flash evaporation feeder 6 and a flash evaporation cyclone separator 7, wherein the flash evaporation main machine 1 is connected with the air blower 3, and the air blower 3 is connected with the lower part of the flash evaporation main machine 1. The air blower 3 is connected with the air storage tank 4 through a pipeline provided with a valve, the air storage tank 4 is connected with the nitrogen making machine 5 through a pipeline provided with a valve, the flash evaporation air inlet heater 2 is connected with the air blower 3, and a pipeline between the air blower 3 and the air storage tank 4 penetrates through the flash evaporation air inlet heater 2; the flash evaporation charging means 6 is connected with the flash evaporation host machine 1, the draught fan 8 is installed on the flash evaporation host machine 1, and the flash evaporation cyclone separator 7 is connected with the air outlet of the draught fan 8. The flash evaporation feeder 6 is provided with a flash evaporation feed inlet, and the flash evaporation feed inlet provided with the flash evaporation feeder 6 is connected with the flash evaporation host 1. The flash evaporation charging hole arranged on the flash evaporation charging device 6 is positioned at the top end of the flash evaporation charging device 6.

In the flash evaporation drying process, the material is conveyed to the middle lower part of the flash evaporation main machine through the flash evaporation feeder, is scattered by the blades, and is conveyed to the top of the tower from bottom to top through the air blower below the flash evaporation main machine 1 and the induced draft fan above the flash evaporation main machine. In this process, the flash column temperature is typically 80-150 ℃, the rate of reaction of the material with carbon dioxide increases, and the carbon content after drying increases significantly as a large amount of gas is bubbled in. A method of a device for reducing carbon content in a precursor of a lithium ion battery positive electrode material comprises the following steps:

step (I): and opening the induced draft fan 8 and the air blower 3 to ensure that the flash evaporation host 1 works under micro negative pressure.

Step (II): the nitrogen generator 5 is started to make nitrogen gas flow through the flash main machine 1 through the blower 3.

Step (three): cooling the solid material in the flash cyclone separator 7, and starting the flash air inlet heater 2; the flash evaporation air inlet heater 2 is heated to 90-180 ℃.

Step (IV): and starting a flash feeder 6, and adding the wet material into the flash main machine 1.

Step (V): after drying the wet materials in the flash evaporation main machine 1, the flash evaporation feeder 6 is closed, the flash evaporation air inlet heater 2 and the flash evaporation main machine 1 are stopped to be heated, the air blower 3, the draught fan 8 and the nitrogen making machine 5 are sequentially closed, and the solid materials in the flash evaporation cyclone separator 7 are stopped to be cooled. The purity of the nitrogen in the nitrogen making machine 5 is more than or equal to 99.5 percent, and the pressure of the nitrogen in the gas storage tank 4 is 0.3MPa to 0.5 MPa.

Example 1

And opening the induced draft fan 8 and the air blower 3 to ensure that the flash evaporation host 1 works under micro negative pressure.

The nitrogen generator 5 is started to make nitrogen gas flow through the flash main machine 1 through the blower 3.

Cooling the solid material in the flash cyclone separator 7, starting the flash air inlet heater 2, and heating the flash air inlet heater 2 to 110 ℃.

And starting a flash feeder 6, and adding the wet material into the flash main machine 1.

After drying the wet materials in the flash evaporation main machine 1, the flash evaporation feeder 6 is closed, the flash evaporation air inlet heater 2 and the flash evaporation main machine 1 are stopped to be heated, the air blower 3, the draught fan 8 and the nitrogen making machine 5 are sequentially closed, and the solid materials in the flash evaporation cyclone separator 7 are stopped to be cooled. The purity of the nitrogen in the nitrogen making machine 5 is 99.8 percent, and the pressure of the nitrogen in the gas storage tank 4 is 0.3MPa to 0.5 MPa. When air was blown under the same conditions, the carbon content was 200-400ppm higher than that when nitrogen was blown.