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Lithium ion battery electrode paste semidry method dispensing process, lithium ion battery positive electrode sheet, lithium ion battery negative electrode sheet, and lithium ion battery

A technology of lithium-ion battery and batching process, which is applied in the production field of lithium-ion batteries, can solve the problems of difficult control of the kneading process, unstable slurry, high solid content, etc., to improve the agglomeration of conductive agents, facilitate slurry coating, The effect of increasing the solid content

Active Publication Date: 2019-12-20
恒大新能源科技集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the solution is added for the first time, the solid content is high, the viscosity is high, and the kneading process is difficult to control, resulting in unstable slurry. The results of the same batching process may vary greatly each time, and the viscosity fluctuates significantly.

Method used

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  • Lithium ion battery electrode paste semidry method dispensing process, lithium ion battery positive electrode sheet, lithium ion battery negative electrode sheet, and lithium ion battery
  • Lithium ion battery electrode paste semidry method dispensing process, lithium ion battery positive electrode sheet, lithium ion battery negative electrode sheet, and lithium ion battery
  • Lithium ion battery electrode paste semidry method dispensing process, lithium ion battery positive electrode sheet, lithium ion battery negative electrode sheet, and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0147] Weigh 96.5 parts of ternary material (NCM) as active material, 1.5 parts of super p powder as conductive agent, 2 parts of PVDF as binder, and NMP as solvent in parts by mass.

[0148] According to this formula, the concrete steps of preparing lithium-ion battery cathode material based on the semi-dry batching process that the present invention provides are as follows:

[0149] Step 1: Divide 1 part of PVDF powder into two parts, of which 1 / 2 part of PVDF powder is used for dry mixing, and the other 1 / 2 part of PVDF powder is used to configure adhesive glue, and bond The solid content of the agent glue is controlled at 6.5%.

[0150] Step 2: Put 96.5 parts of NCM, 1.5 parts of super p powder, and 1 / 2 part of PVDF powder into the mixing tank directly for premixing and stirring, only turn on the revolution, control the speed at 10-20r / Min, and stir for 30Min .

[0151] Step 3: Add NMP to the dry powder premixed in step 2, control the solid content of the slurry at 87%, ...

Embodiment 2

[0155] Weigh 97 parts by mass of ternary material (NCM) as active material, 1.5 parts of super p powder as conductive agent, 1.5 parts of PVDF as binder, and NMP as solvent.

[0156] According to this formula, the concrete steps of preparing lithium-ion battery cathode material based on the semi-dry batching process that the present invention provides are as follows:

[0157] Step 1: Divide 1.5 parts of PVDF powder into two parts, of which 1 / 3 part of PVDF powder is used for dry mixing, and the other 2 / 3 parts of PVDF powder are used to configure adhesive glue, and bond The solid content of the agent glue is controlled at 7%.

[0158] Step 2: Mix 97 parts of NCM and 1.5 parts of super p powder, first turn on the revolution and stir at a low speed for 10 minutes, then add 2 / 3 parts of PVDF powder to prepare the adhesive glue, only turn on the revolution, and control the speed at 30~ 40r / Min, stirring time 60-120Min, the solid content of the slurry is 87%;

[0159] Step 3: Add...

Embodiment 3

[0162] Weigh 96 parts by mass of artificial graphite as the active material, 1 part of super p powder as the conductive agent, 1 part of CMC powder and 2 parts of SBR as the binder, and use deionized water as the solvent.

[0163] According to this formula, the specific steps of preparing lithium-ion battery negative electrode material based on the semi-dry batching process that the present invention provides are as follows:

[0164] Step 1: Divide 1 part of CMC powder into two parts, of which 1 / 2 part of CMC powder is used for dry mixing, and the other 1 / 2 part of CMC powder is used to make adhesive glue, and bond The solid content of the agent glue is controlled at 1.5%.

[0165] Step 2: Add 96 parts of artificial graphite, 1 part of super p powder, and 1 / 2 part of CMC powder directly into the mixing tank for premixing and stirring, only turn on the revolution, control the speed at 10-20r / Min, and the stirring time 30Min.

[0166] Step 3: Add deionized water to the dry pow...

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Abstract

The invention discloses a lithium ion battery electrode paste semidry method dispensing process. The electrode paste contains a binder. The required binder is added in n batches, wherein a binder powder is added in at least one batch, a binder solution is added in at least one batch, and n is an integer greater than or equal to 2. The present invention also discloses a lithium ion battery positiveelectrode sheet, a lithium ion battery negative electrode sheet, and a lithium ion battery prepared by the dispensing process. The solution provided by the invention can not only shorten the stirringtime, increase the solid content of the electrode paste and stabilize the paste viscosity, but also can reduce the equipment load and improve the dispersion performance of the paste.

Description

technical field [0001] The invention relates to the production technology of lithium-ion batteries, in particular to the semi-dry batching process of electrode slurry in the production process of lithium-ion batteries, the positive electrode sheet of lithium-ion battery, the negative electrode sheet of lithium-ion battery and the lithium-ion battery prepared by the above-mentioned electrode slurry . Background technique [0002] At present, the mainstream batching process of domestic power lithium batteries in China is wet mixing, and a few enterprises try dry mixing. From the perspective of China's national policy support and the future development direction of new energy, lithium-ion batteries are currently the most competitive secondary batteries. Because of its high working voltage, high energy density, long cycle life, and environmental protection, it has been widely used in 3C, power, energy storage and other fields. [0003] The preparation of slurry is one of the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/13H01M4/62H01M10/0525
CPCH01M4/04H01M4/13H01M4/621H01M10/0525Y02E60/10
Inventor 杨洪夏依君黄继春汪敏刘小华王张志
Owner 恒大新能源科技集团有限公司
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