Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Multi-solvent system lithium ion battery negative electrode proportioning method

A lithium-ion battery and multi-solvent technology, applied in battery electrodes, electrode manufacturing, secondary batteries, etc., can solve the problems of thickener agglomeration, uneven powder mixing, etc., and achieve improved cracking, good density consistency, and appearance good effect

Pending Publication Date: 2021-05-25
SUZHOU YOULION BATTERY INC
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In patent CN108305987A, the solid powder and dispersant are added at the same time, and then dry-mixed. This method easily leads to agglomeration of the thickener, and at the same time, due to the small amount of dispersant added, it causes uneven mixing with the powder

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Put the negative electrode active material, conductive agent, thickener and other powders into the mixing tank according to the mass ratio (active material: conductive agent: thickener = 95: 1.5: 1.5), then start stirring for 45 minutes, stirring revolution 20rpm , rotation 500rpm, mixing powder;

[0030] 2. Add 70% of the deionized water with a mass ratio of 100 into the mixing tank, first turn on the low-speed stirring for 45 minutes, stir the revolution at 20 rpm, and rotate at 500 rpm;

[0031] 3. Add the remaining 30% deionized water, start the rapid stirring, the time is 90min, the revolution is 30rpm, and the rotation is 1500rpm;

[0032] 4. Add the binder with a mass ratio of 2, start the rapid stirring, the time is 30min, the revolution is 30rpm, and the rotation is 1500rpm;

[0033] 5. Add a modifier with a mass ratio of 3, start rapid stirring for 30 minutes, revolution at 30 rpm, and rotation at 1200 rpm.

Embodiment 2

[0035] 1. Put the negative electrode active material, conductive agent, thickener and other powders into the mixing tank according to the mass ratio (active material: conductive agent: thickener = 96: 1.2: 1.5), then start stirring for 45 minutes, stirring revolution 20rpm , rotation 500rpm, mixing powder;

[0036] 2. Add 70% of the deionized water with a mass ratio of 90 to the mixing tank, first turn on the low-speed stirring for 45 minutes, stir at 20 rpm, and rotate at 500 rpm;

[0037] 3. Add the remaining 30% deionized water and a modifier with a mass ratio of 6, start rapid stirring for 120 minutes, revolution at 30 rpm, and rotation at 1500 rpm;

[0038] 4. Add a binder with a mass ratio of 1.3, start rapid stirring for 30 minutes, revolution at 30rpm, and rotation at 1500rpm.

Embodiment 3

[0040] 1. Put the negative electrode active material, conductive agent, thickener and other powder materials into the mixing tank according to the mass ratio (active material: conductive agent: thickener = 96.5: 0.5: 1.7), then start stirring for 45 minutes, stirring revolution 20rpm , rotation 500rpm, mixing powder;

[0041] 2. Add 70% of the deionized water with a mass ratio of 105 into the mixing tank, first turn on the low-speed stirring for 45 minutes, stir the revolution at 20 rpm, and rotate at 500 rpm;

[0042] 3. Add the remaining 30% deionized water and turn it on quickly

[0043] Stirring time 90min, revolution 30rpm, rotation 1500rpm;

[0044] 4. Add a binder with a mass ratio of 1.3 and a modifier with a mass ratio of 6, start rapid stirring for 30 minutes, revolution at 30 rpm, and rotation at 1500 rpm.

[0045] The experimental data of present embodiment 1-3 is shown in the table below:

[0046] Numbering Slurry viscosity / cP Fineness / μm settlem...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a multi-solvent system lithium ion battery negative electrode proportioning method which comprises the following steps: 1) taking the following raw materials: a negative electrode active matter, a conductive agent, a thickening agent, deionized water, a binder and a modifier in a mass ratio of (90-97): (0.5-2.5): (1-2.5): (80-120): (0.5-2.5): (2.5-10); 2) putting the negative electrode active matter, the conductive agent and the thickening agent into a stirring barrel, and stirring to form mixed powder; 3) adding a part of deionized water into the stirring barrel, stirring for 10-45 minutes at a low speed, and performing stirring revolution at 10-30 rpm and rotation at 300-600 rpm; 4) adding the rest deionized water, quickly stirring for 90-150 minutes, revolving at the speed of 20-50 rpm, and rotating at the speed of 800-1500 rpm; 5) adding a binder, rapidly stirring for 30-60 minutes, carrying out revolution at the speed of 20-50 rpm, and carrying out autorotation at the speed of 500-1500 rpm; and 6) adding a modifier, quickly stirring for 10-30 minutes, revolving at 20-50 rpm, and rotating at 500-1500 rpm. According to the multi-solvent system lithium ion battery negative electrode proportioning method disclosed by the invention, the powder is uniformly mixed, the slurry performance is stable, the slurry homogenizing time is shortened, and the slurry production efficiency is improved.

Description

technical field [0001] The invention belongs to the field of battery negative electrode ingredients, in particular to a multi-solvent system lithium ion battery negative electrode ingredient method. Background technique [0002] The existing common negative electrode ingredients methods include wet mixing method and dry mixing method. The wet mixing method is to mix the thickener (or binder) and the dispersant to prepare the glue, then mix the glue with the conductive agent, and then add the mixed glue into the mixing tank, and stir and mix with the active substance. This method needs to use additional equipment to mix the thickener or binder with the dispersant, the equipment utilization rate is low, and the slurry production cycle is long. The dry mixing method is to mix the dry powder in the mixing tank and then add a solvent to fully mix it. The method has fewer operating procedures, shorter slurry production cycle and good slurry stability. [0003] The existing negat...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01M4/04H01M4/587H01M4/62H01M10/0525
CPCH01M4/04H01M4/587H01M4/625H01M4/622H01M4/623H01M4/62H01M10/0525Y02E60/10
Inventor 尚随军代贤友郑荣鹏
Owner SUZHOU YOULION BATTERY INC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com