Lithium ion battery negative electrode sheet containing electric-conduction coating, and preparation method thereof

A lithium-ion battery and conductive coating technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of increasing the impedance of the pole piece, the specific surface area is not large enough, and the bonding force needs to be further improved, so as to improve the energy density , small impedance, the effect of reducing the impedance of electrochemical reaction

Active Publication Date: 2018-09-07
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also some problems in the above-mentioned conductive coating: 1. Due to the addition of a layer of conductive coating, and the specific surface area of ​​the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0034] Example 1

[0035] A negative electrode sheet of a lithium ion battery containing a conductive coating layer includes a copper foil current collector, a conductive coating layer coated on the copper foil current collector, and a negative electrode active material layer coated on the conductive coating layer.

[0036] The negative active material layer is formed by curing the negative electrode slurry. The negative electrode slurry includes the following parts by weight: 94.8 parts of graphite, 2 parts of conductive carbon black SP, 1.2 parts of sodium carboxymethyl cellulose, 2 Parts of styrene butadiene rubber, 140 parts of deionized water; the conductive coating is cured by conductive paste, the conductive paste includes the following parts by weight: composite carbon source 70 parts (particle size 40-600nm, Specific surface area 100-300m 2 / g of carbon black aggregate 20 parts, tube diameter 0.4-5nm, tube length greater than 30um, specific surface area 300-500m 2 20 parts...

Example Embodiment

[0040] Example 2

[0041] A negative electrode sheet of a lithium ion battery containing a conductive coating layer includes a copper foil current collector, a conductive coating layer coated on the copper foil current collector, and a negative electrode active material layer coated on the conductive coating layer.

[0042] The negative electrode active material layer is formed by curing the negative electrode slurry, and the negative electrode slurry includes the following materials in parts by weight: 94.5 parts of graphite, 2 parts of conductive carbon black SP, 1 part of sodium carboxymethyl cellulose, 2.5 parts by weight Parts of styrene butadiene rubber, 130 parts of deionized water; the conductive coating is cured by conductive slurry, and the conductive slurry includes the following parts by weight: 90 parts of composite carbon source (particle size 40-600nm, Specific surface area 100-300m 2 / g of carbon black aggregate 30 parts, tube diameter 0.4-5nm, tube length greater t...

Example Embodiment

[0046] Example 3

[0047] A negative electrode sheet of a lithium ion battery containing a conductive coating layer includes a copper foil current collector, a conductive coating layer coated on the copper foil current collector, and a negative electrode active material layer coated on the conductive coating layer.

[0048] The negative active material layer is formed by curing the negative electrode slurry. The negative electrode slurry includes the following parts by weight: 94.5 parts of graphite, 1.5 parts of conductive carbon black SP, 2 parts of sodium carboxymethyl cellulose, 2 parts Parts of styrene butadiene rubber, 1150 parts of deionized water; the conductive coating is cured by conductive slurry, the conductive slurry includes the following parts by weight: composite carbon source 50 parts (particle size 40-600nm, Specific surface area 100-300m 2 / g of carbon black aggregate 20 parts, tube diameter 0.4-5nm, tube length greater than 30um, specific surface area 300-500m 2...

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PUM

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Abstract

The invention relates to the field of lithium batteries, and discloses a lithium ion battery negative electrode sheet containing an electric-conduction coating, and a preparation method thereof. The negative electrode sheet comprises a copper foil current collector, an electric-conduction coating and a negative electrode active material layer, wherein the negative electrode active material layer is formed by curing a negative electrode slurry, the negative electrode slurry comprises 93-95 parts of graphite, 1.5-2.5 parts of electric-conduction carbon black SP, 1-2 parts of sodium carboxymethylcellulose, 2-3 parts of styrene-butadiene rubber, and 130-150 parts of deionized water, the electric-conduction coating is formed by curing an electric-conduction slurry, and the electric-conductionslurry comprises 10-95 parts of a composite carbon source, 5-50 parts of a binder, 5-40 parts of a dispersing agent, and 450-550 parts of an organic solvent. According to the present invention, the current collector is coated with the special electric-conduction slurry layer, such that the specific surface area is large, the impedance is low, the bonding force of the electrode sheet can be substantially improved, the electric conductivity can be enhanced, the adding amounts of the binder and the electric-conduction agent can be reduced, and the energy density of the battery can be improved.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a lithium ion battery negative electrode sheet containing a conductive coating and a preparation method thereof. Background technique [0002] At present, the negative electrode sheet of the lithium ion battery generally includes a current collector and a negative electrode active material coated on the current collector. Among them, the current collector of the negative electrode mainly adopts copper foil and light foil. Due to the smooth surface of the light foil, the interface binding force between the negative electrode active material and the current collector is weak when it is coated, resulting in poor adhesion of the negative electrode active material, and it is easy to cause problems such as electrode sheet dropout in the later process. Therefore, the addition amount of the conductive agent must not be increased, and in order to ensure the electrode adhesion, more binde...

Claims

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Application Information

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IPC IPC(8): H01M4/133H01M4/583H01M4/62H01M4/1393H01M10/0525
CPCH01M4/133H01M4/1393H01M4/583H01M4/621H01M4/625H01M10/0525Y02E60/10
Inventor 陆挺王涌吴晨琰
Owner WANXIANG 123 CO LTD
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