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High-nickel type ternary material NCM811 pole piece baking method

A NCM811, ternary material technology, applied in the direction of drying solid materials without heating, drying, drying machine, etc., can solve the problems of unsatisfactory baking effect, complex process steps, and excessive moisture residue, and shorten the baking time. The effect of time, simple process steps and short baking time

Inactive Publication Date: 2019-04-23
肇庆遨优动力电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the production process of lithium-ion battery cells, the pole pieces need to be baked at a constant temperature in vacuum before stacking. Usually, the baking time takes 20 to 30 hours. The number of cycles is large, the process steps are complicated, the baking time is long, and the baking effect is not ideal. More water residue
Therefore, the existing NCM811 pole piece baking method has the problems of complicated process steps, long baking time, and unsatisfactory baking effect.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A high-nickel type ternary material NCM811 pole piece baking method, comprising the following steps:

[0023] (1) First, put the NCM811 pole piece in a stainless steel tray to stack 50 layers, and put the stainless steel tray into a vacuum oven;

[0024] (2) Vacuumize the vacuum oven to a vacuum degree of -0.10MPa, feed dry nitrogen into the vacuum oven to normal pressure, set the temperature of the vacuum oven to 95°C, heat the vacuum oven for baking, and the heating rate is 4°C / min, After the vacuum oven temperature reaches the set temperature, the NCM811 electrode piece baking time is set to 2h;

[0025] (3) Repeat step (2) once;

[0026] (4) Then evacuate the vacuum oven to a vacuum degree of -0.10MPa, set the temperature of the vacuum oven to 75°C, heat the vacuum oven for baking, and the heating rate is 3°C / min. After the temperature of the vacuum oven reaches the set temperature, The baking time of NCM811 pole piece is set to 4h;

[0027] (5) Turn off the heat...

Embodiment 2

[0029] A high-nickel type ternary material NCM811 pole piece baking method, comprising the following steps:

[0030] (1) First, put the NCM811 pole piece in a stainless steel tray to stack 100 layers, and put the stainless steel tray into a vacuum oven;

[0031] (2) Vacuumize the vacuum oven to a vacuum degree of -0.10MPa, pass dry argon gas into the vacuum oven to normal pressure, set the temperature of the vacuum oven to 100°C, heat the vacuum oven for baking, and the heating rate is 4°C / min , after the vacuum oven temperature reaches the set temperature, set the NCM811 electrode piece baking time to 2h;

[0032] (3) Repeat step (2) once;

[0033] (4) Then evacuate the vacuum oven to a vacuum degree of -0.10MPa, set the temperature of the vacuum oven to 80°C, heat the vacuum oven for baking, and the heating rate is 3°C / min. After the temperature of the vacuum oven reaches the set temperature, The baking time of NCM811 pole piece is set to 4h;

[0034] (5) Turn off the hea...

Embodiment 3

[0036] A high-nickel type ternary material NCM811 pole piece baking method, comprising the following steps:

[0037] (1) First, place the NCM811 pole piece in a stainless steel tray to stack 150 layers, and put the stainless steel tray into a vacuum oven;

[0038] (2) Vacuumize the vacuum oven to a vacuum degree of -0.10MPa, feed dry nitrogen into the vacuum oven to normal pressure, set the temperature of the vacuum oven to 105°C, heat the vacuum oven for baking, and the heating rate is 5°C / min, After the vacuum oven temperature reaches the set temperature, the NCM811 electrode piece baking time is set to 2h;

[0039] (3) Repeat step (2) once;

[0040] (4) Then vacuumize the vacuum oven to a vacuum degree of -0.10MPa, set the temperature of the vacuum oven to 85°C, heat the vacuum oven for baking, and the heating rate is 4°C / min. After the temperature of the vacuum oven reaches the set temperature, The baking time of NCM811 pole piece is set to 4h;

[0041] (5) Turn off the...

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PUM

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Abstract

The invention discloses a high-nickel type ternary material NCM811 pole piece baking method. The method comprises the following steps that (1) NCM811 pole pieces are placed in a tray to be stacked, and the tray is put into a vacuum oven; (2) vacuumizing is performed on the vacuum oven, inert gas is introduced into the vacuum oven until normal pressure is reached, and heating is performed for baking; (3) the step (2) is repeated for one time; (4) vacuumizing is performed on the vacuum oven, and heating is performed for baking; and (5) a vacuum oven heating system is turned off, after the vacuum oven is cooled, vacuum breaking is performed, and the pole pieces are taken out. The method has the characteristics of being simple in process step, short in baking time and better in baking effect.

Description

technical field [0001] The invention relates to a pole piece baking method, in particular to a high nickel type ternary material NCM811 pole piece baking method. Background technique [0002] The "Medium and Long-term Development Plan for the Automobile Industry" jointly issued by the Ministry of Industry and Information Technology, the National Development and Reform Commission, and the Ministry of Science and Technology has a phased goal in the new energy field. To achieve 350wh / kg, the specific energy of the system strives to reach 260wh / kg. By 2025, the specific energy of the power battery system will reach 350wh / kg. According to the survey, the current highest energy density of NCM523 is 200wh / kg, while NCM622 and NCM811 can reach more than 230wh / kg and 280wh / kg. If it is necessary to rely on ternary batteries to achieve the goal of 260wh / kg in 2020, only NCM811 can do it. Compared with NCM523 and NCM622, NCM811 has a greater advantage in energy density, but with the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B5/04F26B21/14F26B23/00F26B25/18
CPCF26B5/04F26B21/14F26B23/00F26B25/18
Inventor 查惟伟代东举刘瑞霞陈光森艾群饶睦敏
Owner 肇庆遨优动力电池有限公司