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Preparation method of lithium titanate negative electrode current collector

A current collector, lithium titanate technology, used in electrode manufacturing, battery electrodes, electrical components, etc., to achieve the effects of improving wettability, short drying time, and good compatibility

Active 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 purpose of the present invention is to improve the problems of poor affinity and poor adhesion between the existing lithium titanate negative electrode slurry and the current collector, and provide a titanium Preparation method of lithium acid negative electrode current collector

Method used

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  • Preparation method of lithium titanate negative electrode current collector

Examples

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Effect test

preparation example Construction

[0019] The preparation method of the lithium titanate negative electrode current collector is to select etched copper foil as the negative electrode current collector, soak the negative electrode current collector in the modified solution and perform ultrasonic treatment on the surface, the ultrasonic time is 5~30min, the temperature is 20-40℃, ultrasonic The frequency is 10-30KHz;

[0020] After ultrasonic treatment and drying, after drying, the negative electrode collector is coated with lithium titanate negative electrode slurry, and the density of the coated double sides is 180-220g / m 2 .

[0021] The solvent of the modified solution is N-methylpyrrolidone or acetone, and the additive is one of titanate coupling agent, aluminate coupling agent, borate coupling agent, aluminum-titanium composite coupling agent or Various, the mass percentage of the additive in the modified solution is: 0.3%-7%. The components and mass proportions in the lithium titanate slurry are: conduc...

Embodiment 1

[0023] In this example, the mass ratio of each substance in the lithium titanate slurry is lithium titanate: binder (PVDF-5130): conductive agent (KS-6) = 92.5:5:2.5; solvent is N-methylpyrrolidone ( NMP), the solid content is 67.5%. All substances are fully mixed and uniformly stirred in a solvent to form a paste, and the lithium titanate negative electrode slurry is prepared.

[0024] Soak the etched copper foil in an NMP solution with a mass fraction of 0.5% titanate coupling agent for ultrasonic treatment at a temperature of 30°C for 10 minutes and an ultrasonic frequency of 15KHz.

Embodiment 2

[0026] In this example, the mass ratio of each substance in the lithium titanate slurry is lithium titanate: binder (PVDF-5130): conductive agent (KS-6) = 92.5:5:2.5; the solvent is NMP, and the solid content is 67.5%. All substances are fully mixed and uniformly stirred in a solvent to form a paste, and the lithium titanate negative electrode slurry is prepared.

[0027] Soak the etched copper foil in an NMP modification solution with a mass fraction of 1.7% aluminate coupling agent for ultrasonic treatment at a temperature of 30°C for 15 minutes and an ultrasonic frequency of 15KHz.

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Abstract

The invention belongs to the technical field of a lithium ion battery, and particularly relates to a preparation method of a lithium titanate negative electrode current collector. The preparation method is realized by adopting the following technical scheme: selecting an etching copper foil as a negative electrode current collector, soaking the negative electrode current collector into a modified solution, performing ultrasonic treatment on the surface for 5-30min at the temperature of 20-40DEG C under the ultrasonic frequency of 10-30KHz; drying after the ultrasonic treatment is completed, coating the negative electrode current collector with lithium titanate negative electrode slurry after drying, and the surface density of the coated two sides is 180-220g / m<2>.

Description

technical field : [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a lithium titanate negative electrode current collector. Background technique: [0002] As the most promising green secondary battery at present, lithium-ion power battery has the advantages of long cycle life, good safety performance, low self-discharge, no memory effect, and no pollution. However, the current commercial lithium-ion batteries mainly use graphite as the negative electrode, and there are certain defects in using graphite as the negative electrode material, such as: Lithium precipitation phenomenon is prone to occur during overcharging, causing short circuit of the battery and affecting the safety performance of the lithium battery; forming SEI film It will cause a certain degree of irreversible capacity loss; the deintercalation of lithium ions between the carbon layer structures will cause the volume of the ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/1391
CPCH01M4/1391H01M4/1395H01M4/485H01M4/661Y02E60/10
Inventor 关成善宗继月李涛单传省
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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