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A kind of method of deep drying lithium ion battery powder material

A technology for lithium-ion batteries and powder materials, which is applied in the direction of drying solid materials, drying solid materials, drying chambers/containers, etc. by combining methods, and can solve the problems of long cooling cycle of hot oil, complicated switching of hot and cold oil, and no protection measures, etc. problems, to achieve rapid and uniform heating and cooling, easy industrial application, and high degree of integration

Active Publication Date: 2019-06-18
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the drying degree is limited and uneven, the air consumption is large, and the cooling time takes a long time
The vacuum drying of the mixing tank specifically refers to the method of putting the powder to be dried into a jacketed mixing tank, continuing to vacuumize and injecting a certain temperature of heat-conducting oil into the jacket to dry the powder; although this method does not Air consumption, and with the slow rotation of the kettle body, the drying is relatively uniform, but the disadvantages are: (1) 1-4% of the powder is sucked away during the continuous vacuuming of the material, resulting in material loss; (2) The cooling period of the hot oil is long; although the cooling and heating oil circuit parallel mixing kettle disclosed in the Chinese patent CN104634092A shortens the cooling time of the mixing kettle to a certain extent when the lithium battery powder material is cooled, it is slightly slow due to the switching of the hot and cold oil. complex, so that the whole drying process still takes a long time; (3) the degree of vacuum is generally only 4000-10000Pa, resulting in the moisture absorbed inside the dried powder material still cannot escape; (4) the transfer and removal of dry materials There is no protective measure for the material, which makes some hygroscopic materials absorb water again during the transfer packaging process

Method used

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  • A kind of method of deep drying lithium ion battery powder material
  • A kind of method of deep drying lithium ion battery powder material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] 25 kg of LiNi with a median diameter of 11 μm 0.8 co 0.15 al 0.05 o 2 The powder material is encapsulated in a polytetrafluoroethylene microporous tank. The average pore size of the microporous tank is 6 μm. When the temperature reaches 110°C, stop the ventilation, start the heating rod again, keep the temperature at 110°C for 1 hour, then gradually raise the temperature to 180°C and keep the temperature, keep vacuuming until the vacuum degree is stable at 80Pa, turn off the heating after drying for 10 hours, and continue to pass in normal temperature decarburization dry air To cool the material, after the drying oven is reduced to normal pressure, the material is transferred to a drying room with a dew point of -40°C connected in series with the drying oven, and the material is taken out and packaged in an aluminum-plastic film bag to obtain the corresponding positive electrode material.

Embodiment 2

[0065] 10 kg of LiFePO with a median diameter of 3 μm 4 / C The powder material is packed in 5kg / bag in a polypropylene composite microporous bag of 20×30cm. The average micropore size of the microporous bag is 1 μm. The bag is placed in a microwave vacuum drying oven and preheated to Dry N at 105°C 2 When the temperature of the material reaches 100°C, stop the ventilation, heat the powder material with a microwave with a power of 2kW and a frequency of 2450Hz, and continue vacuuming until the vacuum degree is stable at 50Pa. 2 To cool the material, after the drying furnace is reduced to normal pressure, the material is transferred to the drying furnace connected in series with the drying furnace. 2 In a simple plexiglass glove box with a dew point of -50°C, open the bag and take out the material and package it in an aluminum-plastic film bag to obtain a powder material with a correspondingly low moisture content.

Embodiment 3

[0067] The median diameter of 5kg is 20μm, and the specific surface area is 700m 2 The porous carbon additive per gram is placed in a macroporous stainless steel chamber with a polyimide microporous membrane as the inner coating. The average micropore size of the microporous membrane is 10 μm. Put the chamber into a vacuum drying kettle and pass into dry N preheated to 118°C 2 When the temperature of the material reaches 110°C, the ventilation is stopped, and the jacket is heated by heating oil, and the vacuum is continuously evacuated until the vacuum degree is stable at 50Pa. After drying for 8 hours, the heating device is turned off, and the dry air at normal temperature is continuously introduced to cool the material, and the drying kettle is lowered to After normal pressure, transfer the material to a glove box connected in series that is full of air and has a water content below 1ppm. Open the bag, take out the material and seal it in an aluminum-plastic film bag to obta...

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Abstract

The invention relates to a microporous container used for deeply drying lithium ion battery powder materials and a deep drying method. The pore diameters of micro pores of the microporous container are smaller than or equal to the average grain diameter of the lithium ion battery powder materials, and the microporous container is resistant to the drying temperature equal to or smaller than 300 DEG C, so that it is ensured that the materials are basically not leaked under the high vacuum degree smaller than 100 Pa, and the material receiving rate approaches to 100%. According to the deep drying method, the powder materials are packaged in the microporous container which is placed in vacuum drying equipment, circulating thermal-conducting drying gas is led into the container to heat the materials, and heat preserving and preheating are carried out; then vacuumizing is carried out to reach the preset ultrahigh vacuum degree, drying is carried out, and circulating cold-conducting drying gas is led into the container for cooling; and then the container is transferred to a low-dew-point-value environment connected with the drying equipment in series, the materials are taken out, and sealing and storing are carried out. By means of the deep drying method, the lithium ion battery electrode materials with ultralow water content which is hard to achieve under conventional drying conditions can be obtained, and the method has important application value.

Description

technical field [0001] The invention relates to the field of powder material processing, in particular to a method for deep drying of powder materials, in particular to a method for deep drying of lithium ion battery powder materials. Background technique [0002] As new energy vehicles have higher and higher requirements for the electrochemical performance and safety performance of lithium-ion power batteries, the requirements for the constituent materials of organic electrolyte lithium-ion batteries and the moisture control in the battery manufacturing process are also becoming more and more stringent. Since the moisture in the battery will undergo a series of chemical reactions with the electrolyte components during the charging and discharging process of the battery: 1) H 2 O gets electrons and decomposes to produce OH - and H 2 ;OH - with Li in the electrolyte + The reaction generates solid LiOH; LiOH further gains electrons and combines with Li + The reaction prod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F26B25/06F26B7/00
Inventor 吴小珍杨顺毅岳敏
Owner BTR NEW MATERIAL GRP CO LTD
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