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In-situ joule heat water removal and oil removal method for high-nickel-silicon system lithium ion battery material

A lithium-ion battery and Joule heating technology, which is applied in the field of removing water and oil from high-nickel positive electrode and silicon-containing negative electrode lithium-ion battery system, and removing water and residual oil from positive and negative electrode materials of lithium-ion battery. Drying time, increased power consumption and other problems, to achieve the effect of short operation cycle, energy saving and rapid removal

Active Publication Date: 2020-01-03
陕西埃普诺新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the amount of material to be dried is large, it is difficult to dry the material sufficiently, so it is necessary to extend the drying time (generally greater than 24 hours) and increase the oven temperature, which will inevitably increase power consumption by 3-5 times
[0005] Once the high-nickel cathode material absorbs water, it is difficult to remove the water by oven drying, and the removal of bound water on the surface of the high-nickel material can no longer be achieved by simple drying methods
Similarly, if the silicon-containing negative electrode material is not properly treated, there will be a certain amount of residual oil, which is difficult to clean through simple solvent extraction and washing processes

Method used

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  • In-situ joule heat water removal and oil removal method for high-nickel-silicon system lithium ion battery material
  • In-situ joule heat water removal and oil removal method for high-nickel-silicon system lithium ion battery material
  • In-situ joule heat water removal and oil removal method for high-nickel-silicon system lithium ion battery material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] An embodiment of the present invention provides a method for in-situ Joule heat removal of water from a high-nickel positive electrode NCM622 (nickel content 60%). (Blank experiment is the material prepared by ordinary vacuum drying oven 10Pa, temperature 120°C, drying time 8h)

[0038] 1) 950g high-nickel positive electrode material (NCM622) and 50g conductive agent (SP) were uniformly mixed according to the ratio of 95%:5% to obtain material 5 and placed in container 4, and the test resistance was 10000 ohms;

[0039] 2) Connect the wires to the electrodes 21 and 22 respectively, connect the power supply voltage to 50V, and heat up for 240 minutes;

[0040] 3) Place the above container 4 in a vacuum box with a pressure of 10 Pa.

[0041] One side plate 41 of the container 4 is in contact with but not fixed relative to the side plates on both sides, so that the volume of the container can be compressed by compressing the side plate 41 into the container.

[0042] Aft...

Embodiment 2

[0048] An embodiment of the present invention provides a method for in-situ Joule heat removal of water from a high-nickel positive electrode NCM811 (80% nickel content). (Blank experiment is the material prepared by ordinary vacuum drying oven 10Pa, temperature 120°C, drying time 8h)

[0049] Mix 800g high-nickel positive electrode material (NCM811), 100g conductive agent (SP) and 100g composite agent PVDF (Solvay 5130) according to the ratio of 80%: 10%: 10% to obtain material 5 and place it in container 4. The test resistance is 2000 ohms;

[0050] Connect the wires to the electrodes 21 and 22 respectively, connect the power supply voltage to 500V, and heat up for 10 minutes;

[0051] The above container 4 was placed in a vacuum box with a pressure of 100 Pa.

[0052] The dried NCM811 material was obtained through the above steps 1)-3).

[0053] The moisture content in the material was detected by a Mettler-Toledo moisture detector, and the moisture content in the NCM811...

Embodiment 3

[0057] The embodiment of the present invention provides a method for removing water by Joule heat in situ in a high-nickel positive electrode NCA (80% nickel content). (Blank experiment is the material prepared by ordinary vacuum drying oven 10Pa, temperature 120°C, drying time 8h)

[0058] Mix 500g high-nickel positive electrode material (NCA), 450g conductive agent (SP) and 50g composite agent PVDF (Arkema 900) according to the ratio of 50%: 45%: 5% to obtain material 5, place it in container 4, and test the resistance 200 ohms;

[0059] Connect the wires to the electrodes 21 and 22 respectively, connect the power supply voltage to 300V, and heat up for 60 minutes;

[0060] The above container 4 was placed in a vacuum box with a pressure of 0.1 MPa.

[0061] The dried NCA material is obtained through the above steps 1)-3).

[0062] The moisture content in the material was detected by a Mettler-Toledo moisture detector, and the moisture content in the NCA material was obta...

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Abstract

The invention discloses an in-situ joule heat water removal and oil removal method for an electrode material. The method mainly aims at a high-nickel-silicon system lithium ion battery material pretreatment technology. By adopting the method provided by the invention, rapid water removal of a positive electrode material and rapid oil removal of a negative electrode material can be realized in situ, the moisture in the high-nickel positive electrode material and the residual oil in the silicon-containing negative electrode material are greatly reduced, the comprehensive performance of batteriesmade of the material is improved, and finally, long-cycle stable operation of lithium ion batteries is realized. Meanwhile, the energy loss caused by traditional drying by using a high-capacity and high-power drying oven is reduced, and finally, rapid water removal and oil removal of the material under low energy consumption are realized.

Description

technical field [0001] The invention relates to the field of dewatering and degreasing of industrial powder materials, in particular to a method for removing water and residual oil from positive and negative materials of lithium-ion batteries, and in particular to a method for dewatering lithium-ion battery systems with high-nickel positive electrodes and silicon-containing negative electrodes and degreasing methods. Background technique [0002] In recent years, new energy vehicles with lithium-ion batteries as the main power source have been widely used, and at the same time, there have been different degrees of fires in lithium-ion battery vehicles. After analysis, most of the reasons are: due to the lithium-ion battery during the preparation process , there is no good control of the moisture and residual oil, which will eventually lead to battery expansion and cause battery short circuit and other reasons. [0003] Moisture control is a crucial factor in the manufacturi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/485H01M4/505H01M4/525H01M4/587H01M10/0525F26B3/34
CPCF26B3/34H01M4/386H01M4/485H01M4/505H01M4/525H01M4/587H01M10/0525Y02E60/10
Inventor 孟宪斌苑克国周敏付光辉赵越
Owner 陕西埃普诺新能源科技有限公司