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Blending process of lithium ion battery cathode paste, lithium ion battery cathode plate and lithium ion battery

A lithium-ion battery, cathode slurry technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as the improvement of the dispersibility and consistency of the unfavorable slurry, the overall performance of the positive electrode and the low utilization rate of equipment, etc. problems, to achieve the effect of improving equipment utilization, shortening batching time, and shortening production time

Active Publication Date: 2018-07-13
BEIJING NAT BATTERY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current dry mixing process still takes a long time. The whole batching process takes ten hours or more, and the production efficiency is low, resulting in low equipment utilization. In addition, when mixing pulp, the solid content of the slurry is generally low or low. High, which is not conducive to the improvement of the dispersion and consistency of the slurry, and is not conducive to the improvement of the overall performance of the final positive electrode sheet

Method used

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  • Blending process of lithium ion battery cathode paste, lithium ion battery cathode plate and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0099] A batching process of lithium ion battery cathode slurry, comprising the following steps:

[0100] (a) Calculate and weigh lithium iron phosphate, conductive carbon black, polyethylene glycol and CMC according to the mass ratio, and carry out dry mixing at a speed of 20r / min in revolution and 0r / min in rotation for 30min to obtain a mixed powder;

[0101] (b) Add NMP, first mix and stir for 10min at a speed of 20r / min in revolution and 0r / min in rotation, then mix and stir for 120min at a speed of 35r / min in revolution and 0r / min in rotation to obtain a primary slurry with a solid content of 83.8wt%. Material, the add-on of NMP is 83.8wt% by solid content;

[0102] (c) Add NMP again, mix and stir for 10min at a speed of 20r / min in revolution and 0r / min in rotation, and then mix and stir for 90min at a speed of 35r / min in revolution and 1000r / min in rotation, to obtain a secondary compound with a solid content of 67.4wt%. Grade slurry, the addition of NMP is 67.4wt% by ...

Embodiment 2

[0107] A batching process of lithium ion battery cathode slurry, comprising the following steps:

[0108] (a) Calculate and weigh lithium iron phosphate, conductive carbon black, polyethylene glycol and CMC according to the mass ratio, and carry out dry mixing at a speed of 20r / min in revolution and 0r / min in rotation for 35min to obtain a mixed powder;

[0109] (b) Add NMP, mix and stir for 12min at a speed of 20r / min in revolution and 0r / min in rotation, then mix and stir for 115min at a speed of 35r / min in revolution and 0r / min in rotation to obtain a primary slurry with a solid content of 83wt%. , the addition of NMP is 83wt% by solid content;

[0110] (c) Add NMP again, first mix and stir for 15min at a speed of 20r / min in revolution and 0r / min in rotation, then mix and stir for 60min at a speed of 35r / min in revolution and 1000r / min in rotation to obtain a secondary compound with a solid content of 67wt%. Slurry, the addition of NMP is 67wt% by solid content;

[0111] ...

Embodiment 3

[0115] A batching process of lithium ion battery cathode slurry, comprising the following steps:

[0116] (a) Calculate and weigh lithium iron phosphate, conductive carbon fiber, polyvinylpyrrolidone and CMC according to the mass ratio, and carry out dry mixing at a speed of 25r / min in revolution and 0r / min in rotation for 30min to obtain a mixed powder;

[0117] (b) Add NMP, first mix and stir for 10min at a speed of 15r / min in revolution and 0r / min in rotation, then mix and stir for 120min at a speed of 45r / min in revolution and 0r / min in rotation to obtain a primary slurry with a solid content of 85wt%. , the addition of NMP is 85wt% by solid content;

[0118] (c) Add NMP again, first mix and stir for 10min at a speed of 15r / min in revolution and 0r / min in rotation, then mix and stir for 90min at a speed of 30r / min in revolution and 1500r / min in rotation to obtain a secondary compound with a solid content of 68wt%. Slurry, the addition of NMP is 68wt% by solid content;

...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and relates to a blending process of lithium ion battery cathode paste, a lithium ion battery cathode plate and a lithium ion battery. The blending process comprises the following steps: (a) dry-mixing a cathode active material, a conductive auxiliary agent, a dispersing agent and a thickening agent to obtain mixed powder; (b)adding a solvent and evenly mixing to obtain primary paste with a solid content of 82-85wt%; (c) then adding a solvent and evenly mixing to obtain secondary paste with a solid content of 66-68wt%; (d)adding a solvent and evenly mixing to obtain third paste with a solid content of 56-59wt%, and further preparing the lithium ion battery cathode paste. The blending process provided by the inventionis simple in process and easy to operate, can remarkably reduce the blending time, increases the equipment utilization rate, is uniform in material mixing, and improves the dispersity, consistency andfineness of the paste.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a batching process of a positive electrode slurry of a lithium ion battery, a positive electrode sheet of a lithium ion battery and a lithium ion battery. Background technique [0002] In the existing secondary battery system, lithium-ion batteries are currently the most competitive secondary batteries in terms of development space and technical indicators such as life, specific energy, working voltage and self-discharge rate. Lithium-ion batteries have the advantages of high working voltage, high energy density, long cycle life, low self-discharge rate, and environmental protection, and have become the development trend of secondary batteries; they have been widely used in wireless communications, digital cameras, notebook computers and other portable appliances. Power supply, and has broad application prospects as a power supply for special application...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M4/136H01M10/0525
CPCH01M4/136H01M4/364H01M4/5825H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 李云郭伟吴丛笑张景舒文哲泽
Owner BEIJING NAT BATTERY TECH