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

Preparation method of lithium titanate negative-electrode slurry

A technology of negative electrode slurry and lithium titanate, which is applied in the direction of negative electrode, battery electrode, active material electrode, etc., can solve the problem of poor bonding performance between negative electrode slurry and negative electrode current collector, so as to improve electrochemical performance and reduce loss The powder probability and the effect of improving the bonding performance

Inactive Publication Date: 2015-04-29
SHANDONG GOLDENCELL ELECTRONICS TECH
View PDF6 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is to improve the poor bonding performance between the existing lithium titanate negative electrode slurry and the negative electrode current collector, and provide a lithium titanate that can effectively improve the coating force and bonding performance of the negative electrode slurry and the negative electrode current collector. The preparation method of negative electrode slurry achieves the purpose of improving the electrochemical performance and safety performance of lithium titanate battery

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

preparation example Construction

[0016] A method for preparing lithium titanate negative electrode slurry, characterized in that malonic acid is added to the raw material of lithium titanate negative electrode slurry, and the lithium titanate negative electrode slurry is formulated according to mass percentage: lithium titanate: 85-91%, PVDF: 3-5%, conductive agent: 4-6%, malonic acid: 2-4%. In this embodiment, the production steps are as follows: (1) Bake the lithium titanate and the conductive agent at 120-140°C for 4-5 hours, and cool down to 40-55°C in dry air after baking; (2) Mix lithium titanate, PVDF, conductive agent dry powder for 1-2 hours, then add to the solvent NMP in 2-4 times, the time interval of each addition is 20-30 minutes, add malonic acid after stirring for 4-5 hours, continue stirring and pumping Vacuum, stir for 1-2 hours, and then sieve through a 150-180 mesh screen to obtain lithium titanate negative electrode slurry.

[0017] In this embodiment, the amount of the solvent NMP is 1....

Embodiment 1

[0019] The negative electrode slurry is formulated according to mass percentage: lithium titanate: 90%, PVDF: 5%, conductive agent: 5%. Lithium titanate and conductive agent were baked at 120°C for 5 hours, and then cooled to 55°C in dry air after baking. Mix lithium titanate, PVDF, conductive agent dry powder for 1 hour, then add it into NMP in 2 times. The lithium titanate negative electrode slurry is obtained by sieving through a mesh.

[0020] Coating according to the normal coating process, the surface density is 190g / m 2 Lithium titanate negative electrode sheet, and the pressed density is 1.5g / cm 3 Roll coating the dried pole pieces. Adhere the high-temperature tape to the pole piece behind the opposite roller, squeeze out the gas inside, and quickly tear off the tape at an angle of 120 degrees to the pole piece. The test peel strength value is 0.13N.

Embodiment 2

[0022] The negative electrode slurry is formulated according to mass percentage: lithium titanate: 85%, PVDF: 5%, conductive agent: 6%, malonic acid: 4%. Lithium titanate and conductive agent were baked at 120°C for 5 hours, and then cooled to 55°C in dry air after baking. Mix lithium titanate, PVDF, conductive agent dry powder for 1 hour, then add to NMP in 2 times, the time interval between each feeding is 30 minutes, add malonic acid after stirring for 5 hours, continue to stir and vacuumize, the vacuum pressure is -0.11Mpa, After stirring for 1 hour, sieve through a 160-mesh sieve to obtain lithium titanate negative electrode slurry.

[0023] Coating according to the normal coating process, the surface density is 190g / m 2 Lithium titanate negative electrode sheet, and the pressed density is 1.5g / cm 3 Roll coating the dried pole piece. Adhere the high-temperature tape to the pole piece behind the opposite roller, squeeze out the gas inside, and quickly tear off the tape ...

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

PropertyMeasurementUnit
Peel strength valueaaaaaaaaaa
Peel strength valueaaaaaaaaaa
Peel strength valueaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of lithium titanate negative-electrode slurry. The preparation method is characterized in that malonic acid is added into the lithium titanate negative-electrode slurry raw material. The lithium titanate negative-electrode slurry is prepared from the following materials in percentage by weight: 85-91% of lithium titanate, 3-5% of PVDF, 4-6% of a conducting agent and 2-4% of malonic acid. The preparation method comprises the following steps: baking lithium titanate and the conducting agent at 120-140 DEG C for 4-5 hours, and cooling to 40-55 DEG C in dry air after baking; mixing lithium titanate, PVDF and the dry conducting agent powder for 1-2 hours, then adding the obtained mixture into solvent NMP by 2-4 times at the time intervals of 20-30 minutes, stirring for 4-5 hours, then adding malonic acid, stirring further, vacuumizing, stirring for 1-2 hours, and screening by a sieve of 150-180 meshes so as to obtain the lithium titanate negative-electrode slurry.

Description

technical field [0001] The invention relates to a preparation method of negative electrode slurry in the field of lithium ion batteries, in particular to a preparation method of lithium titanate negative electrode slurry. Background technique [0002] Due to the advantages of high energy density, high output voltage, long cycle life, and low environmental pollution, lithium-ion batteries have been widely used in small digital electronic products, and have broad application prospects in electric vehicles, aerospace and other fields. However, in recent years, incidents of lithium-ion battery explosions and injuries used in mobile phones, digital cameras and notebook computers have become common, and the safety of lithium-ion batteries has aroused widespread concern. At present, most commercial lithium-ion batteries use graphite materials as negative electrode materials, but when carbon / graphite is charged and discharged for the first time, an SEI film will be formed on the car...

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): H01M4/485
CPCH01M4/131H01M4/485H01M2004/027Y02E60/10
Inventor 关成善宗继月李涛贾传龙刘艳辉
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com