Lithium titanate slurry of lithium battery and preparation method thereof

A technology for lithium titanate and lithium batteries, which is applied in the field of preparation of lithium titanate slurry for negative electrodes of lithium batteries. The effect of coating

Active Publication Date: 2021-03-09
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a preparation method of lithium titanate slurry for the negative electrode of lithium batteries. The technical problem to be solved is the agglomeration problem in the lithium titanate batching process, so as to solve the problems of difficulty in sieving and coating with particles, and provide lithium battery performance

Method used

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  • Lithium titanate slurry of lithium battery and preparation method thereof
  • Lithium titanate slurry of lithium battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] ① Add 52g of binder and 1932g of lithium titanate into the dry powder mixer and mix for 20-30min, stir and rotate at 15-25rpm to obtain a uniformly mixed mixture 1;

[0024] ②Add mixture 1 into a stirring pot with 1881g of solvent, mix and stir for 150-180min, the revolution of the mixer is 20-35rpm, and the rotation is 2000-3000rpm to obtain a uniform mixture 2;

[0025] ③ Add 390g of conductive agent into the mixture 2, mix and stir for 40-60min, the revolution of the mixer is 20-35rpm, and the stirring rotation is 2000-3000rpm to obtain a homogeneous mixture 3;

[0026] ④ Grind the mixture 3 with a sand mill equipped with 1.0-1.4mm zirconium beads on one side, and then add it to the mixer for stirring. The stirring time is 30-40min, the revolution of the mixer is 20-35rpm, and the vacuum degree is ≤ -0.08mPa to prepare 47%, lithium titanate slurry with a viscosity of 6000-12000mPa·s.

[0027] ⑤Lithium battery production process: sieving, coating, sheet production, w...

Embodiment 2

[0030] ① Add 54g of binder and 1928g of lithium titanate into the dry powder mixer and mix for 20-30min, stir and rotate at 15-25rpm to obtain a uniformly mixed mixture 1;

[0031] ②Add the mixture 1 into a stirring pot with 2087g of solvent, mix and stir for 150-180min, the revolution of the mixer is 20-35rpm, and the stirring rotation is 2000-3000rpm to obtain a uniform mixture 2;

[0032] ③Add 375g of conductive agent into the mixture 2, mix and stir for 40-60min, the revolution of the mixer is 20-35rpm, and the stirring rotation is 2000-3000rpm to obtain a homogeneous mixture 3;

[0033] ④ Grind the mixture 3 with a sand mill equipped with 1.0-1.4mm zirconium beads on one side, and then add it to the mixer for stirring. The stirring time is 30-40min, the revolution of the mixer is 20-35rpm, and the vacuum degree is ≤ -0.08mPa to prepare 45%, lithium titanate slurry with a viscosity of 6000-12000mPa·s.

[0034] ⑤Lithium battery production process: sieving, coating, sheet p...

Embodiment 3

[0037] ① Add 56g of binder and 1924g of lithium titanate into the dry powder mixer and mix for 20-30min, stir and rotate at 15-25rpm to obtain a uniformly mixed mixture 1;

[0038] ② Add mixture 1 into a stirring pot with 2181g of solvent, mix and stir for 150-180min, the revolution of the mixer is 20-35rpm, and the rotation is 2000-3000rpm to obtain a uniform mixture 2;

[0039] ③ Add 384g of conductive agent into the mixture 2, mix and stir for 40-60min, the revolution of the mixer is 20-35rpm, and the rotation of the mixer is 2000-3000rpm to obtain a homogeneous mixture 3;

[0040] ④ Grind the mixture 3 with a sand mill equipped with 1.0-1.4mm zirconium beads on one side, then add it to the mixer and stir for 30-40min, the mixer revolution is 20-35rpm, the vacuum degree is ≤-0.08mPa, and the solid content is prepared 44%, lithium titanate slurry with a viscosity of 6000-12000mPa·s.

[0041] ⑤Lithium battery production process: sieving, coating, sheet production, winding, l...

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Abstract

The invention relates to lithium titanate slurry of a lithium battery and a preparation method of the lithium titanate slurry and belongs to the technical field of lithium batteries. The preparation method comprises the following steps: (1), stirring lithium titanate and a binder to obtain mixed powder; (2), adding the product obtained in the step (1) into a solvent in batches and performing stirring to obtain a mixture; (3), adding a conductive agent into the product in the step (2) and performing stirring to obtain a mixture; and (4), sanding the product obtained in the step (3) by adoptinga sanding process, and carrying out stirring and vacuum defoaming to obtain the lithium titanate slurry of the lithium battery. Compared with the prior art, the preparation method of the lithium titanate slurry of the lithium battery has the advantages that the problem that lithium titanate is difficult to disperse in the burdening process can be solved, the preparation time of the lithium titanate slurry is effectively shortened, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and more specifically, the invention relates to a preparation method of a negative electrode lithium titanate slurry of a lithium battery. Background technique [0002] Since the industrialization of lithium batteries in 1991, the negative electrode materials of batteries have always been graphite materials. Lithium titanate material has been valued as an anode material for new lithium batteries due to its excellent performance. Lithium titanate battery has the characteristics of small size, high energy density, no memory effect, high charge and discharge rate, long cycle life, wide working environment temperature range, etc. It has a very wide range of applications in the field of communication voltage, aerospace, power vehicles, etc. prospect. [0003] Lithium titanate material can maintain a high degree of stability in the crystal structure during the embedding and deintercalation proces...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/58H01M10/0525
CPCH01M4/485H01M4/5825H01M10/0525Y02E60/10
Inventor 贾传龙王勇张敬捧薛娟娟
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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