Drying method for positive electrode material of lithium ion battery

An electrode material and positive electrode technology, which is applied in the drying field of positive electrode materials, can solve the problems of large fluctuations in the total water content of the electrode, high total water content, and affecting the uniformity and service life of lithium-iron battery product quality. Effects of shortening baking time, reducing moisture content, and ensuring stability

Active Publication Date: 2011-06-29
FUJIAN NANPING NANFU BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the total water content in the electrode is high and the total water content between different electrodes fluctuates greatly, which will seriously affect the quality uniformity and service life of lithium-iron batteries

Method used

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  • Drying method for positive electrode material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Put the positive electrode material with a mass of about 300kg into the drying chamber through the material receiving trolley. The positive electrode material is placed in a roll, and the width of the positive electrode material is 80mm, and the outer diameter is at most 600mm. Next, vacuumize the drying chamber so that the vacuum degree in the drying chamber reaches 1 Torr. Then, nitrogen with a purity of 99.999% was injected to raise the pressure in the drying chamber to 740 Torr. Then, increase the temperature in the drying chamber to make it reach 250 o After C, vacuum again to 2Torr. Then, at constant temperature (250 o C) Under constant pressure (2Torr), keep baking for 10 hours. During the baking process, the internal circulation fan in the drying room is in a state of high-speed rotation. After the baking is finished, nitrogen gas is injected to restore the pressure value in the drying chamber to 760 Torr, and then, it is cooled to normal temperature. So far...

Embodiment 2

[0042] Put the positive electrode material with a mass of about 30kg into the drying chamber through the material receiving trolley. The positive electrode material is placed in a roll, and the width of the positive electrode material is 80mm, and the maximum outer diameter is 600mm. Next, vacuumize the drying chamber so that the vacuum degree in the drying chamber reaches 1 Torr. Then, nitrogen with a purity of 99.999% was injected to raise the pressure in the drying chamber to 740 Torr. Then, increase the temperature in the drying chamber so that its temperature reaches 120 o After C, vacuum again to 8 Torr. Then, at constant temperature (120 o C) Under constant pressure (8Torr), keep baking for 2 hours. Next, perform a back pressure process, that is, inject nitrogen gas to back pressure to 600 Torr and keep it for 10 minutes. Then, reduce the pressure in the drying chamber to 8 Torr, and bake for 2 hours. This is repeated 6 times, that is, the baking time is 12 hours. ...

Embodiment 3-21

[0045] Examples 3-21 adopt the same process steps as Example 2, and the process parameters and experimental results involved are shown in Table 1.

[0046] Table 1

[0047]

[0048] It can be seen from Table 1 that the total water content of the positive electrode materials obtained by the drying method according to the present invention is not higher than 1400ppm, and the total water content of the positive electrode materials obtained in most embodiments is not higher than 1000ppm.

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Abstract

The invention provides a drying method for a positive electrode material of a lithium ion battery. The method comprises the following steps: a) placing a positive electrode material in a drying chamber with an internal circulation fan; b) vacuumizing the drying chamber; c) introducing a protection gas into the drying chamber; d) heating and vacuumizing the drying chamber, rising the temperature of the drying chamber to a predetermined temperature, and reducing the pressure value of the drying chamber to a predetermined pressure value, wherein the predetermined temperature is 120 to 300 DEG C, and the predetermined pressure value is not more than 20 Torr; e) roasting the positive electrode material under the predetermined pressure value and the predetermined temperature, wherein the internal circulation fan is rotated in the roasting process; and f) cooling and taking out the positive electrode material. According to the drying method provided by the invention, the moisture content of the positive electrode material can be effectively reduced, the total positive electrode material of the positive electrode materials is less than 1400 ppm, and even less than 1000 ppm, the stability for the drying degree of the positive electrode materials can be ensured, and the security and service life of the battery are improved.

Description

technical field [0001] The invention relates to the technical field of chemical power sources, in particular to a method for drying positive electrode materials of lithium-iron batteries. Background technique [0002] In the battery industry, lithium-iron batteries have received more and more attention and attention due to their advantages such as high energy density, high voltage, wide operating temperature range, and long life. Over the past decade, lithium-iron batteries have dominated the primary (non-rechargeable) and secondary (rechargeable) battery markets and are widely used in portable electronic devices such as mobile phones, notebook computers, and digital cameras . Among them, the positive pole piece of the lithium-iron battery is an important part of the lithium-iron battery and the core of the lithium-iron battery. [0003] At present, the production of positive pole pieces requires processes such as slurry, coating, drying, rolling, and shearing. Among them,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/139F26B7/00
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 张清顺叶永锋常海涛赵洋
Owner FUJIAN NANPING NANFU BATTERY
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