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
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  • 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 c

Method used

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Examples

Experimental program
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Example Embodiment

[0016] A preparation method of lithium titanate negative electrode slurry, which is 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 prepared by 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 to 5 hours, and cool down to 40-55°C in dry air after baking; (2) Mix lithium titanate, PVDF, and conductive agent dry powder for 1 to 2 hours, and then add them to the solvent NMP in 2 to 4 times. The time interval for each addition is 20 to 30 minutes. After stirring for 4 to 5 hours, add malonic acid, continue stirring and pumping Vacuum, stirring for 1 to 2 hours, sieving with a 150-180 mesh screen to obtain lithium titanate negative electrode slurry.

[0017] In this embodiment, the amount o...

Example Embodiment

[0018] Example 1

[0019] The negative electrode slurry is prepared by mass percentage: lithium titanate: 90%, PVDF: 5%, conductive agent: 5%. The lithium titanate and the conductive agent are baked at 120°C for 5 hours, and the temperature is reduced to 55°C in dry air after baking. Mix lithium titanate, PVDF and conductive agent dry powder for 1 hour, and then add it to NMP in 2 batches. The feeding interval is 30 min. Stir for 5 hours. Continue stirring and vacuum. Vacuum pressure is -0.09Mpa. After stirring for 1 hour, use a 150 mesh sieve The mesh is sieved to obtain the lithium titanate negative electrode slurry.

[0020] According to the normal coating process, the surface density is 190g / m 2 Lithium titanate negative electrode sheet, and the pressing density is 1.5g / cm 3 Roll coating the dried pole piece. Stick the high temperature tape on the pole piece behind the opposite roller, and squeeze out the gas inside, and quickly tear off the tape at an angle of 120 degrees to...

Example Embodiment

[0021] Example 2

[0022] The negative electrode slurry is prepared by mass percentage: lithium titanate: 85%, PVDF: 5%, conductive agent: 6%, and malonic acid: 4%. The lithium titanate and the conductive agent are baked at 120°C for 5 hours, and the temperature is reduced to 55°C in dry air after baking. Mix lithium titanate, PVDF, and conductive agent dry powder for 1 hour, and then add them to NMP in 2 batches. The time interval for each addition is 30 minutes. After stirring for 5 hours, add malonic acid, continue stirring and vacuum, the vacuum pressure is -0.11Mpa, After stirring for 1 hour, sieved with a 160-mesh screen to obtain lithium titanate negative electrode slurry.

[0023] According to the normal coating process, the surface density is 190g / m 2 Lithium titanate negative electrode sheet, and the pressing density is 1.5g / cm 3 Roll coating the dried pole piece. Stick the high-temperature tape on the pole piece behind the opposite roller, and squeeze out the gas insid...

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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

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Application Information

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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
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