Method for recycling agglomerated or hardened jelly formed in positive electrode gel preparation process

A technology of jelly and positive electrode, which is applied in the direction of battery electrodes, structural parts, final product manufacturing, etc., can solve problems such as waste, and achieve the effect of low cost and high purity

Active Publication Date: 2022-03-18
HUBEI JINQUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a method for recycling and utilizing the agglomerated or hardened jelly in the process of making positive electrode glue. It can be directly prepared into glue with NMP and PVDF for use in the pulping process

Method used

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  • Method for recycling agglomerated or hardened jelly formed in positive electrode gel preparation process
  • Method for recycling agglomerated or hardened jelly formed in positive electrode gel preparation process
  • Method for recycling agglomerated or hardened jelly formed in positive electrode gel preparation process

Examples

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Effect test

Embodiment 1

[0038] This embodiment provides a method for recycling and utilizing the anode gel making process to form agglomerated or plated jelly, the method includes the following steps:

[0039] (1) Cut the collected agglomerated or plate-like jelly into 6cm in size with a ceramic knife 2 The small piece, weigh 55kg, put it into a 1000L stainless steel stirring tank, add 850kg N-methylpyrrolidone (NMP) and 5.02kg n-propanol to the stainless steel stirring tank, set the temperature of the stirring tank to 50°C, and the vacuum Set it to -80kPa, set the stirring speed to 25rpm, the dispersion speed to 1200rpm, stir and disperse for 4h, m1 / (m1+m2)=6%, m3 / (m1+m2+m3)=0.55%;

[0040] (2) stop dispersing, cool to 23 ℃, break the vacuum, take a sample to detect the solid content of the glue, the measured value is 5.13%;

[0041] (3) Add 8.33kg of PVDF powder, set the temperature of the mixing tank to 50°C, set the vacuum degree to -80kPa, and the dispersion speed to 1200rpm, stir and disperse ...

Embodiment 2

[0043] This embodiment provides a method for recycling and utilizing the anode gel making process to form agglomerated or plated jelly, the method includes the following steps:

[0044] (1) Cut the collected agglomerated or plate-like jelly into 8cm in size with a ceramic knife 2 60kg, put into a 1000L volume stainless steel mixing tank, add 800kg N-methylpyrrolidone (NMP) and 5kg n-propanol to the stainless steel mixing tank, set the temperature of the mixing tank at 50°C, and set the vacuum -80kPa, the stirring speed is set to 25rpm, the dispersion speed is 1200rpm, stirring and dispersing for 4h, m1 / (m1+m2)=7%, m3 / (m1+m2+m3)=0.58%;

[0045] (2) Stop the dispersion, cool to 23°C, break the vacuum, take a sample to detect the solid content of the glue, and the measured value is 5.25%;

[0046] (3) Add 7.56kg of PVDF powder, set the temperature of the mixing tank to 50°C, set the vacuum degree to -80kPa, and the dispersion speed to 1200rpm, stir and disperse for 2 hours, stop t...

Embodiment 3

[0048] The only difference between this embodiment and embodiment 1 is that the quality of NMP described in step (1) is 600kg, and other conditions and parameters are exactly the same as embodiment 1, m1 / (m1+m2)=8.3%.

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Abstract

The invention provides a method for recycling jelly formed in a positive electrode gel making process, which comprises the following steps of: (1) crushing the jelly formed in the positive electrode gel making process to obtain small jelly blocks; (2) mixing the small blocks of jelly with NMP and an alcohol regulator, stirring and dispersing to obtain a glue solution; and (3) adjusting the solid content of the glue solution, and carrying out filtration treatment and iron removal treatment to obtain the glue solution for later use, the method solves the problem of waste caused by PVDF agglomeration or hardening in the glue preparation process, and the recovered agglomerated or hardened jelly can be directly prepared into the glue solution with NMP and PVDF to be used in the pulping process.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and relates to a method for forming agglomerated or plated jelly-like objects in the process of recycling positive electrode glue. Background technique [0002] The stirring and pulping process in the preparation process of the positive electrode sheet of the ternary lithium-ion battery needs to use the glue prepared by N-methylpyrrolidone (NMP) and polyvinylidene fluoride (PVDF), for the convenience and efficiency of the pulping process. Usually, the glue making and pulping processes are separated, and the solid content, viscosity, appearance and other properties of the glue have a great influence on the pulping effect, and the quality of the slurry directly affects the electrical properties of the ternary lithium battery. In the process of large-scale continuous glue making, the factory adopts a continuous automatic feeding system to put a certain amount of PVDF into NMP, dissolve the...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/0525H01M4/62
CPCH01M10/058H01M10/0525H01M4/623Y02E60/10Y02P70/50Y02W30/84
Inventor 龚林刘金成刘建华李圭善代强马雅洁梁鑫赵栓柱
Owner HUBEI JINQUAN NEW MATERIALS CO LTD
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