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Conductive slurry and preparation method thereof, electrode plate coated with conductive slurry, and lithium ion battery

A lithium-ion battery and conductive paste technology, which is applied to battery electrodes, secondary batteries, circuits, etc., can solve the problems affecting the performance of lithium-ion batteries, affecting the effect of coating pole pieces, and the conductive paste is easy to settle. Rate performance and cycle stability, high rate performance and cycle stability, low internal resistance

Inactive Publication Date: 2016-09-07
DONGGUAN JOYSUN NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, conventional lithium-ion batteries have problems such as too long preparation period and poor dispersion effect in the process of preparing conductive paste, which leads to the easy sedimentation of conductive paste during coating, which affects the effect of coating pole pieces, thereby affecting the lithium ion battery. battery performance

Method used

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  • Conductive slurry and preparation method thereof, electrode plate coated with conductive slurry, and lithium ion battery
  • Conductive slurry and preparation method thereof, electrode plate coated with conductive slurry, and lithium ion battery
  • Conductive slurry and preparation method thereof, electrode plate coated with conductive slurry, and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation of positive electrode conductive paste comprises steps:

[0030] (1) Weigh the following materials according to the following mass percentages: positive electrode active material 92.5%, positive electrode binder 2%, and conductive agent 5.5%;

[0031] (2) Stir the positive electrode binder for 3 hours at a stirring speed of 47rpm and a dispersion speed of 1595rpm;

[0032] (3) Add conductive agent and stir for 1 hour under the conditions of stirring speed 47rpm and dispersion speed 1815rpm;

[0033] (4) Add positive electrode active material and stir for 2 hours at a stirring speed of 55rpm and a dispersion speed of 1815rpm to prepare a positive electrode conductive slurry; and

[0034] (5) Add N-methylpyrrolidone and stir for 0.2 hours at a stirring speed of 32 rpm to adjust the viscosity of the positive electrode conductive paste, which is to be coated on the positive electrode sheet.

[0035] Preparation of negative electrode conductive paste comprises ...

Embodiment 2

[0043] Preparation of positive electrode conductive paste comprises steps:

[0044] (1) Weigh the following materials according to the following mass percentages: positive electrode active material 95.5%, positive electrode binder 0.5%, and conductive agent 4%;

[0045] (2) Stir the positive electrode binder for 5 hours at a stirring speed of 59 rpm and a dispersion speed of 1925 rpm;

[0046] (3) Add a conductive agent, and stir for 2 hours under the conditions of a stirring speed of 59rpm and a dispersion speed of 2145rpm;

[0047] (4) Add positive electrode active material and stir for 3 hours at a stirring speed of 67rpm and a dispersion speed of 2145rpm to prepare a positive electrode conductive slurry; and

[0048](5) Add N-methylpyrrolidone and stir for 1 hour at a stirring speed of 44 rpm to adjust the viscosity of the positive electrode conductive paste, which is to be coated on the positive electrode sheet.

[0049] Preparation of negative electrode conductive past...

Embodiment 3

[0057] Preparation of positive electrode conductive paste comprises steps:

[0058] (1) Weigh the following materials according to the following mass percentages: 93% positive electrode active material, 3.5% positive electrode binder, and 2.5% conductive agent;

[0059] (2) Stir the positive electrode binder for 4.5 hours at a stirring speed of 57 rpm and a dispersion speed of 1900 rpm;

[0060] (3) Add a conductive agent, and stir for 1.2 hours under the conditions of a stirring speed of 57 rpm and a dispersion speed of 2000 rpm;

[0061] (4) Add positive electrode active material and stir for 2.3 hours at a stirring speed of 65rpm and a dispersion speed of 2000rpm to prepare a positive electrode conductive slurry; and

[0062] (5) Add N-methylpyrrolidone and stir for 0.3 hours at a stirring speed of 40 rpm to adjust the viscosity of the positive electrode conductive paste, which is to be coated on the positive electrode sheet.

[0063] Preparation of negative electrode con...

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Abstract

The invention relates to the technical field of lithium ion batteries, and in particular relates to conductive slurry for a lithium ion battery. The conductive slurry comprises positive electrode conductive slurry coated on a positive electrode plate and negative electrode conductive slurry coated on a negative electrode plate; according to mass percent, the positive electrode conductive slurry comprises 92.5%-95.5% of positive electrode active materials, 0.5%-3.5% of positive electrode adhesives and 2.5%-5.5% of conductive agents; and the negative electrode conductive slurry comprises 93%-96% of negative electrode active materials, 1.4%-3.4% of negative electrode adhesives, 0.9%-3.9% of conductive agents and 0.2%-2.2% of thickening agents. The prepared conductive slurry is stable in conductivity, good in dispersion effect and hard in settlement. The invention further relates to a preparation method of the conductive slurry, an electrode plate containing the conductive slurry, and the lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a conductive paste for lithium ion batteries and a preparation method thereof, pole pieces and lithium ion batteries prepared by using the conductive paste. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, good safety performance and low cost, and have broad application prospects in the field of new energy: on the one hand, they can be used as power batteries, and can be widely used in plug-in hybrid vehicles, electric vehicles, Space vehicles and underwater vehicles, etc.; on the other hand, it can also be used as an energy storage battery, which can be applied to the backup power supply of communication base stations, wind energy and solar energy storage, and power supply in remote areas far away from the mains area. In the lithium-ion battery manufacturing process, the preparation of the conductive paste coated on th...

Claims

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Application Information

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IPC IPC(8): H01M4/131H01M4/62H01M10/0525
CPCH01M4/131H01M4/625H01M10/0525Y02E60/10
Inventor 陈志道汤欣平杨前新朱瑞宝张明发
Owner DONGGUAN JOYSUN NEW ENERGY
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