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Water control technology of lithium iron phosphate

A lithium iron phosphate, moisture technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of excessive moisture content, low nitrogen utilization, time-consuming and other problems, achieve small fluctuations in moisture content, increase quality stability, avoid The effect of material water absorption

Inactive Publication Date: 2017-09-26
FOSHAN DYNANONIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to control the moisture content of lithium iron phosphate, most manufacturers adopt the method of adding drying process before packaging, or adding material baking equipment before the pulping process in the battery manufacturing process, and some manufacturers set airflow crushing, mixing, and packaging processes to Crushing and packaging in a dry room or under a nitrogen atmosphere, these methods have problems such as time-consuming, energy-consuming, and high environmental conditions
Although it is easier to implement the technology of placing jet crushing, mixing, and packaging processes in a drying room, the process cost is relatively low, but there are problems such as high requirements on environmental conditions and unstable moisture control, and it is easy to cause moisture content due to environmental changes. exceed the standard
Although crushing and packaging in a nitrogen atmosphere can effectively control the moisture content of the product, due to the large amount of gas used in the jet crushing process and the low utilization rate of nitrogen, the cost will rise sharply, which is even more costly than adding a drying process before packaging, which is not effective. Reduce energy consumption

Method used

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  • Water control technology of lithium iron phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1, see figure 1 :

[0023] The invention provides a kind of moisture control technology of lithium iron phosphate, comprising the following steps (see figure 1 ):

[0024] 1) Unloading: The lithium iron phosphate material from the kiln is directly sent into the drying room 1, and the saggar is turned over by the mechanical arm 2 to make the material enter the air conveying device 3 through the rotary valve.

[0025] 2) Air conveying: using cold-dried compressed air as a carrier, the lithium iron phosphate material is sent from the air conveying device 3 to the storage tank 4.

[0026] 3) Pulverization: The dry compressed air enters the gas heater 6 through the compressed air inlet pipe 5, and is heated to 160 ° C. The high-temperature compressed air is used as the pulverization and drying air source, and the material is transported to the airflow mill 6. In the mill 7, the material is pulverized and dried, and the pulverized material enters the grading wheel ...

Embodiment 2

[0031] The other steps are the same as the implementation 1, the difference is that in step 3), the dry compressed air is heated to 120°C and used as the pulverizing and drying air source.

[0032] After testing, the moisture content of lithium iron phosphate products is less than 500ppm.

Embodiment 3

[0034] The other steps are the same as in Example 1, the difference is that in step 3), the dry compressed air is heated to 180°C and used as the pulverizing and drying air source.

[0035] After testing, the moisture content of lithium iron phosphate products is less than 500ppm.

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Abstract

The invention provides a water control technology of lithium iron phosphate. The water control technology comprises the following steps of material discharging: directly sending the lithium iron phosphate material from a furnace kiln into a drying room, and enabling a mechanical arm to turn a sagger to send the material into an air flow conveying device via a rotary valve; airflow conveying: using freeze-drying compressed air as a carrier, and sending the lithium iron phosphate material from a conveying tank into a material storage tank; crushing, using heated high-temperature compressed air as a crushing and drying air source, crushing and drying the material in an air flow mill, and sending the crushed material into a grading wheel to screen; packaging: sending the screened material into a dedusting bin to separate air and solid, sending the separated material into a packaging material, and packaging. The water control technology has the advantages that the lithium iron phosphate material is not in direct contact with environment air, the air flow grinding and drying are performed by the high-temperature compressed air, and then the content of water in a product is smaller than 500ppm; the technology is simple, the production cycle is short, the cost is low, the energy consumption is low, the content of water in the product is stable, and the like.

Description

technical field [0001] The invention relates to the technical field of electrochemical material manufacture, in particular to a moisture control process of lithium iron phosphate. Background technique [0002] The water content of the finished lithium iron phosphate cathode material directly affects the electrochemical performance of the battery. The manufacturer of lithium iron phosphate will strictly control the water content of lithium iron phosphate in the production process, generally requiring the moisture content to be within 500ppm. However, due to the fine particles and large specific surface area of ​​lithium iron phosphate powder, its water absorption is strong. If it is exposed to the air for a longer time or the ambient humidity is high, its moisture content will exceed 1000ppm. In order to control the moisture content of lithium iron phosphate, most manufacturers add a drying process before packaging, or add material baking equipment before the slurry mixing p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397H01M4/58
CPCH01M4/1397H01M4/5825Y02E60/10
Inventor 孔令涌刘其峰陈杰李意能徐浩
Owner FOSHAN DYNANONIC