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Device and method for reducing carbon content in lithium ion battery positive electrode material precursor

A technology for lithium ion batteries and cathode materials, which is applied in electrode manufacturing, drying gas arrangement, dryers, etc., can solve the problem of easy introduction of carbon-containing impurities, and achieve the effect of reducing the content of carbon impurities, improving quality, and being convenient for modification.

Pending Publication Date: 2021-12-10
格林爱科(荆门)新能源材料有限公司
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  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the problem that carbon-containing impurities are easily introduced during flash drying in the prior art, the present invention provides an improved device and method for reducing the carbon content in the precursor of lithium-ion battery positive electrode materials, which is beneficial to reduce the carbon content in the finished product of flash drying. carbon-containing impurities

Method used

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  • Device and method for reducing carbon content in lithium ion battery positive electrode material precursor

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Embodiment 1

[0028] Turn on the induced draft fan 8 and the blower 3 to make the flash evaporation host 1 work under a slight negative pressure.

[0029] Turn on the nitrogen generator 5 to allow nitrogen to flow through the flash evaporation host 1 through the blower 3 .

[0030] Cool the solid material in the flash cyclone separator 7, turn on the flash inlet heater 2, and raise the temperature of the flash inlet heater 2 to 110°C.

[0031] Start the flash feeder 6, and add the wet material into the flash host 1.

[0032] After drying the wet material in the flash host 1, close the flash feeder 6, stop heating the flash inlet heater 2 and the flash host 1, turn off the blower 3, the induced draft fan 8, the nitrogen generator 5 in turn, and stop Cool the solid material in the flash cyclone separator 7. The purity of the nitrogen in the nitrogen generator 5 is 99.8%, and the pressure of the nitrogen in the gas storage tank 4 is 0.3MPa-0.5MPa. When air is blown under the same conditions...

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Abstract

The invention discloses a device for reducing the carbon content in a lithium ion battery positive electrode material precursor. The device comprises a flash evaporation feeder (6), a flash evaporation main machine (1), an air blower (3), a gas storage tank (4) and a nitrogen making machine (5) which are connected in sequence, and also 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 reducing method comprises the following steps: starting the induced draft fan, the air blower and the nitrogen making machine; cooling solid materials in the flash evaporation cyclone separator, and starting the flash evaporation air inlet heater and the flash evaporation feeder; and after wet materials in the flash evaporation main machine are dried, shutting down the flash evaporation feeder, stopping heating of the flash evaporation air inlet heater and the flash evaporation main machine, shutting down the air blower, the induced draft fan and the nitrogen making machine sequentially, and stopping cooling. According to the device and method, the carbon content in a finished product is reduced by 200-400ppm.

Description

technical field [0001] The invention belongs to the technical field of precursors of cathode materials for lithium-ion batteries, and in particular relates to a device and method for reducing the carbon content in precursors of cathode materials for lithium-ion batteries. Background technique [0002] In the production process of the precursor of ternary cathode materials for lithium-ion batteries, carbon-containing impurities will inevitably be introduced. In the production process of the battery cathode material precursor, when drying with the existing flash dryer, air needs to be blown in, and the temperature is usually 80-150°C. It can be found through thermodynamic calculations that the carbon dioxide and nickel-cobalt-manganese in the air In this temperature range, hydroxides can react to form carbonates, resulting in higher carbon content in the finished product. Contents of the invention [0003] Aiming at the problem that carbon-containing impurities are easily i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B21/14F26B21/00H01M4/04
CPCF26B21/14F26B21/004H01M4/04Y02E60/10
Inventor 许开华师树临陆卫军陈永安
Owner 格林爱科(荆门)新能源材料有限公司