Lithium ion battery anode slurry and preparation method thereof

A lithium-ion battery and positive electrode slurry technology, which is applied in the direction of electrode manufacturing, secondary batteries, active material electrodes, etc., can solve the problems of uneven thickness distribution of the electrode sheet, insufficient stability, slurry deposition, etc., and achieve consistent improvement stability and cycle performance, improved stability, and improved consistency

Inactive Publication Date: 2009-12-23
JIANGSU FRONT NEW ENERGY
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The defect of this preparation formula is mainly that the viscosity of the slurry is too high and the stability is not high enough. During the coating process, the slurry will be deposited, resulting in poor consistency of the slurry and the thickness distribution of the coated pole piece. Uneven, affecting the performance of the battery

Method used

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  • Lithium ion battery anode slurry and preparation method thereof
  • Lithium ion battery anode slurry and preparation method thereof
  • Lithium ion battery anode slurry and preparation method thereof

Examples

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Embodiment 1

[0020] This example illustrates the preparation method of the lithium manganate positive electrode slurry provided by the present invention.

[0021] 1. Drying of positive active material

[0022] The positive electrode active material lithium manganese oxide was baked at 110°C for 12 hours in a vacuum environment of 0.05 MPa, and cooled to room temperature with dry gas with a dew point temperature of -50°C.

[0023] 2. Preparation of positive electrode

[0024] Taking 50g / part as an example, dissolve 225g polyvinylidene fluoride (PVDF, F2) in 3250g N-methylpyrrolidone (NMP) solvent and mix for 6-8 hours to make gel, and then dry 4350g lithium manganate , 175g of carbon black, 250g of dispersant hypermer kd-1 (British Croda Company) were added to the above solution, and fully stirred for 8-12 hours to obtain positive electrode slurry. Apply the slurry to a 20 μm aluminum foil with a coater, heat and dry in vacuum at 120°C for 2 hours, roll and cut into pieces to obtain 500mm...

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Abstract

The invention belongs to the field of lithium batteries and discloses lithium ion battery anode slurry and a preparation method thereof. The formula of the slurry adopts the following components according to parts by weight: 63-89 parts of lithium manganate, 1.8-3.6 parts of conductive agent, 2.5-4.8 parts of binding agent, 2-15 parts of dispersant and 58-80 parts of solvent. As the dispersant is added in the slurry, the viscosity of the slurry is reduced, the stability of the slurry is improved, and the phenomenon of slurry deposition is avoided in the coating process of pole pieces, therefore, the consistency of the slurry and the consistency of the distribution of the slurry on a current collector aluminum foil are improved, and the consistency and the cycling capability of the battery can be improved.

Description

technical field [0001] The invention belongs to the field of lithium batteries, and relates to a positive electrode slurry of a lithium ion battery and a preparation method thereof. Background technique [0002] At present, the lithium manganate positive electrode slurry components for lithium ion batteries generally only include positive electrode active material (lithium manganate), conductive agent, binder, solvent, and no dispersant is added. The defect of this preparation formula is mainly that the viscosity of the slurry is too high and the stability is not high enough. During the coating process, the slurry will be deposited, resulting in poor consistency of the slurry and the thickness distribution of the coated pole piece. Unevenness affects the performance of the battery. Contents of the invention [0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned technical formula, and provide a lithium manganate positive electr...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M4/04H01M10/36H01M10/40
CPCY02E60/122Y02E60/10
Inventor 吴丽军袁春刚王青魏廷全韩伟
Owner JIANGSU FRONT NEW ENERGY
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